Cable operation performance degradation evaluation and construction defect backtracking method, device, equipment, medium and system based on inverse problem solving

Abstract

This application provides a method, apparatus, equipment, medium, and system for cable performance degradation assessment and construction defect backtracking based on inverse problem solving. It includes: identifying the cable to be evaluated and obtaining its cable polarization characteristic sequence and dielectric loss characteristic sequence generated during power outage testing; generating a cable operation fingerprint sequence based on the polarization and dielectric loss characteristic sequences; performing segmented tracing processing on the fingerprint sequence to generate cable degradation characteristic indicators; importing the indicators into a preset cable operation benchmark map for matching verification, triggering a construction reverse engineering engine if the verification fails; inputting the indicators into the engine to perform reverse backtracking mapping and outputting a construction tension node record table; locating cable material damage segments based on the record table and the overall topology map, and generating a defect backtracking report. This application improves the reliability of defect backtracking and source tracing.

Description

Technical Field

[0001] This application relates to the field of cable testing and maintenance technology, specifically to a cable performance degradation assessment and construction defect backtracking method based on inverse problem solving, a cable performance degradation assessment and construction defect backtracking device based on inverse problem solving, an electronic device, a computer-readable storage medium, and a cable performance degradation assessment and construction defect backtracking system based on inverse problem solving. Background Technology

[0002] With the continuous expansion of urban power supply networks and large-scale industrial distribution networks, underground power cable networks have become the core carrier of power transmission. During long-term underground operation, cables are subject to continuous influence from internal electrical stress and the external environment, inevitably leading to performance degradation of their insulation materials and conductor structures. Therefore, effectively assessing the operating status of cables to ensure power supply stability is a crucial requirement in the current power operation and maintenance field.

[0003] Existing cable operation status assessment and defect investigation schemes typically employ a monitoring architecture that combines forward physical simulation with comparison to fixed empirical thresholds. This scheme first deploys numerous online monitoring sensors along the cable line to collect real-time partial discharge signals and temperature distribution data from the cable surface. Subsequently, the monitoring master station compares the collected real-time physical signals with a pre-set single fixed threshold parameter. If the real-time signal exceeds the limit, the suspected faulty physical area is directly marked on the monitoring interface.

[0004] However, this forward physical signal threshold comparison scheme has obvious technical defects. Since the tensile damage to long-distance cables during the early construction and laying stages is often latent, simply relying on forward comparison of real-time partial discharge or temperature signals cannot effectively establish a mapping relationship between operational performance degradation and early construction stress damage. Furthermore, this forward judgment mode lacks a mechanism for continuous segmented tracking of cable polarization and dielectric loss characteristics over time and comparison with historical benchmark maps. When a sudden change in cable performance occurs, it is difficult to initiate reverse deduction and backtracking processes, resulting in low ability to locate and backtrack early hidden material damage segments of the cable, and failing to meet the needs of in-depth cable construction defect tracing. Summary of the Invention

[0005] This application provides a method, apparatus, electronic device, computer-readable storage medium, and system for cable performance degradation assessment and construction defect backtracking based on inverse problem solving, so as to at least alleviate the above-mentioned technical problems.

[0006] The technical advantages of the technical solution provided in this application are: This application presents a cable performance degradation assessment and construction defect backtracking method based on inverse problem solving. Addressing the shortcomings of traditional forward physical signal threshold comparison schemes—namely, their inability to effectively establish the link between operational degradation and early construction damage, and the lack of continuous segmented tracking and reverse inference mechanisms—this method acquires the cable polarization and dielectric loss characteristic sequences generated during power outage testing. It then generates a cable operational fingerprint sequence and performs segmented tracking processing to generate cable degradation characteristic indicators. This solves the problem of traditional schemes relying solely on real-time partial discharge or temperature signals, which fails to provide in-depth insight into insulation degradation. Compared to traditional methods using a single fixed threshold comparison, this application's operational fingerprint sequence can continuously track the cable state from the microscopic physical characteristics of polarization and dielectric loss during power outage testing, tracking fluctuations in degradation characteristic indicators. This significantly improves the foresight and depth of cable performance degradation assessment.

[0007] Based on the generated cable degradation feature indicators, they are imported into a preset cable operation benchmark map for matching verification. When the matching verification fails, the cable construction reverse engineering engine is triggered to perform reverse backtracking mapping processing and output a cable construction tensile node record table. This solves the problem of traditional schemes lacking historical benchmark comparison and reverse engineering tracing mechanisms. Compared to the traditional forward judgment mode, which only performs surface location marking after a signal exceeds the limit, this application triggers reverse engineering through matching failure. It can directly solve the problem based on the abrupt performance degradation index and trace back to earlier construction tensile nodes, thus establishing a reverse mapping link between performance degradation and early construction tensile damage. This results in higher reverse engineering efficiency and tracing capability for potential construction defects.

[0008] Finally, based on the cable construction tensile node record table and the preset overall cable topology map, the damaged segments of cable materials are located, and a defect retrospective report is generated. This overcomes the shortcomings of traditional methods in locating early, concealed material damage segments. Compared to the vague warning of suspected physical areas in traditional methods, this application combines tensile attribute records with the overall topology map for comprehensive calibration. The generated defect retrospective report can more clearly indicate the location of local material damage caused by early construction, greatly improving the efficiency and reliability of cable concealed construction defect investigation. Attached Figure Description

[0009] Figure 1 This application provides an embodiment of a cable performance degradation assessment and construction defect backtracking scenario based on inverse problem solving. Figure 2 This application provides an embodiment of a cable operation performance degradation assessment and construction defect backtracking method based on inverse problem solving. Detailed Implementation

[0010] like Figure 1As shown, this is a scenario for cable performance degradation assessment and construction defect backtracking based on inverse problem solving, according to an embodiment of this application. Figure 2 The image illustrates an embodiment of this application of a cable operation performance degradation assessment and construction defect backtracking method based on inverse problem solving. The method includes the following steps: identifying the cable to be assessed and obtaining the cable polarization characteristic sequence and cable dielectric loss characteristic sequence generated during a power outage test; generating a cable operation fingerprint sequence based on the cable polarization characteristic sequence and cable dielectric loss characteristic sequence; performing segmented tracking processing on the cable operation fingerprint sequence to generate a cable degradation characteristic indicator; importing the cable degradation characteristic indicator into a preset cable operation benchmark map corresponding to the cable to be assessed for matching verification, and triggering a cable construction reverse inference engine when the matching verification fails; inputting the cable degradation characteristic indicator into the cable construction reverse inference engine for reverse backtracking mapping processing to output a cable construction tensile node record table; locating cable material damage segments based on the cable construction tensile node record table and a preset overall cable topology map corresponding to the cable to be assessed, and generating a cable construction defect backtracking report for the cable material damage segments.

[0011] Optionally, a cable operation fingerprint sequence is generated based on the cable polarization feature sequence and the cable dielectric loss feature sequence, including: performing principal component extraction on the cable polarization feature sequence to obtain a cable polarization scalar; performing vectorization on the cable polarization scalar to generate a cable polarization dimension-reduced vector; performing principal component extraction on the cable dielectric loss feature sequence to obtain a cable dielectric loss scalar; performing vectorization on the cable dielectric loss scalar to generate a cable dielectric loss dimension-reduced vector; and generating a cable operation fingerprint sequence based on the cable polarization dimension-reduced vector and the cable dielectric loss dimension-reduced vector.

[0012] Preferably, the specific implementation process of the step "generating a cable operation fingerprint sequence based on the cable polarization feature sequence and the cable dielectric loss feature sequence" is as follows: Before the cable polarization feature sequence and the cable dielectric loss feature sequence enter the principal component extraction process, the polarization test record identifier, polarization test time field, polarization test channel field, and polarization test condition field are read from the cable polarization feature sequence, and the dielectric loss test record identifier, dielectric loss test time field, dielectric loss test channel field, and dielectric loss test condition field are read from the cable dielectric loss feature sequence; then, the polarization test record identifier and dielectric loss test record identifier are respectively matched with the cable identifier of the cable to be evaluated to form the cable source correspondence result; the polarization test time field and dielectric loss test time field are aligned by time window to form the time sampling correspondence result; the polarization test channel field, dielectric loss test channel field, polarization test condition field, and dielectric loss test condition field are checked for test condition consistency to form the test condition correspondence result; finally, the cable source correspondence result, the time sampling correspondence result, and the test condition correspondence result are written into the same power outage test alignment record. The power outage test alignment record is not simply an identification and registration result, but a data verification basis used to limit whether cable polarization characteristic sequences and cable dielectric loss characteristic sequences can enter the same fingerprint construction process. When performing principal component extraction on the cable polarization characteristic sequence, the time sampling correspondence result in the power outage test alignment record is read to determine the current power outage test occurrence time, thus avoiding misconfiguration of polarization responses from different power outage test occurrence times to the same cable operation fingerprint unit. Similarly, when performing principal component extraction on the cable dielectric loss characteristic sequence, the test condition correspondence result in the power outage test alignment record is read to verify the correspondence between the dielectric loss test condition field and the polarization test condition field, thus avoiding misconfiguration of dielectric loss responses from inconsistent test condition sources to the same cable operation fingerprint unit.

[0013] Preferably, after the power outage test alignment record is formed, a preset multi-dimensional reference space corresponding to the cable type of the cable to be evaluated is retrieved based on the cable source correspondence result in the power outage test alignment record. The preset multi-dimensional reference space is pre-configured from historical power outage test samples of the same type of cable. The historical power outage test samples include cable polarization reference characteristic sequence, cable dielectric loss reference characteristic sequence, reference test time field, and reference test condition field. When pre-configuring the preset multi-dimensional reference space, the cable polarization reference characteristic sequence is first expanded according to the reference test time field to form a polarization reference field time table. Each row of the polarization reference field time table corresponds to a polarization reference record of a historical power outage test sample under a reference test time field. Each column of the polarization reference field time table corresponds to a polarization reference field. The field value at the intersection of the row and column is used to characterize the polarization response value of the historical power outage test sample under the reference test time field. Next, the cable dielectric loss reference feature sequence is expanded according to the reference test time field to form a dielectric loss reference field timetable. Each row of the dielectric loss reference field timetable corresponds to a dielectric loss reference record of a historical power outage test sample under a reference test time field. Each column of the dielectric loss reference field timetable corresponds to a dielectric loss reference field. The field value at the intersection of the row and column is used to characterize the dielectric loss response value of the historical power outage test sample under that reference test time field. The polarization reference field timetable is further used to configure the polarization feature coordinate axis, and the dielectric loss reference field timetable is further used to configure the dielectric loss feature coordinate axis, thereby providing the preset multidimensional reference space with a source of field coordinates that can be directly read by subsequent principal component extraction processing.

[0014] Preferably, the polarization feature coordinate axes in the preset multidimensional reference space are configured as follows: First, field center extraction processing is performed on each polarization reference field in the polarization reference field timetable to form a polarization field center value, and field discrete amplitude extraction processing is performed on each polarization reference field in the polarization reference field timetable to form a polarization field discrete scale value; then, the center value of the polarization field is used to perform center offset processing on the corresponding polarization reference field in the polarization reference field timetable to form a polarization center offset field value, and the polarization center offset field value is used to perform amplitude conversion processing on the polarization field discrete scale value to form a polarization reference canonical field value. The polarization reference canonical field value is backfilled according to the row and column positions of the polarization reference field timetable to form a polarization reference canonical field timetable; then, polarization field association records are generated according to the synchronous change relationship between different polarization reference fields in the polarization reference canonical field timetable. Polarization field association records are used to record the degree of co-directional and anti-directional change of any two polarization reference fields under multiple reference test time fields. When extracting the polarization principal component direction based on the polarization field association records, combinations of polarization fields that can cover the larger field association changes are first selected to form polarization candidate direction records. Then, the polarization candidate direction records are sorted according to the coverage of field association changes to form the polarization feature coordinate axis. The polarization feature coordinate axis includes the polarization field arrangement order and polarization field direction weights. The polarization field arrangement order comes from the polarization field combinations in the polarization candidate direction records, and the polarization field direction weights come from the degree of co-directional and anti-directional change in the polarization field association records. The polarization field arrangement order and polarization field direction weights continue to participate in the formation process of the cable polarization scalar. The technical essence of the polarization feature coordinate axis is that it is a coordinate reference formed by the common change direction of polarization response in historical power outage test samples, rather than the original amplitude of a single polarization field directly serving as the coordinate reference.

[0015] Preferably, the dielectric loss characteristic coordinate axes in the preset multi-dimensional reference space are configured as follows: First, field center extraction processing is performed on each dielectric loss reference field in the dielectric loss reference field timetable to form a dielectric loss field center value, and field discrete amplitude extraction processing is performed on each dielectric loss reference field in the dielectric loss reference field timetable to form a dielectric loss field discrete scale value; then, the center value of the dielectric loss field is used to perform center offset processing on the corresponding dielectric loss reference field in the dielectric loss reference field timetable to form a dielectric loss center offset field value, and the discrete scale value of the dielectric loss field is used to perform amplitude conversion processing on the dielectric loss center offset field value to form a dielectric loss reference specification field value. The dielectric loss reference specification field value is backfilled according to the row and column positions of the dielectric loss reference field timetable to form a dielectric loss reference specification field timetable; then, based on the synchronous change relationship between different dielectric loss reference fields in the dielectric loss reference specification field timetable, dielectric loss field association records are generated. The dielectric loss field association record is used to record the degree of co-directional and anti-directional change of any two dielectric loss reference fields under multiple reference test time fields. When extracting the dielectric loss principal component direction based on the dielectric loss field association record, firstly, combinations of dielectric loss fields that can cover the larger field association changes are selected to form dielectric loss candidate direction records. Then, the dielectric loss candidate direction records are sorted according to the coverage of field association changes to form the dielectric loss characteristic coordinate axis. The dielectric loss characteristic coordinate axis includes the dielectric loss field arrangement order and the dielectric loss field direction weight. The dielectric loss field arrangement order comes from the dielectric loss field combinations in the dielectric loss candidate direction records, and the dielectric loss field direction weight comes from the degree of co-directional and anti-directional change in the dielectric loss field association record. The dielectric loss field arrangement order and dielectric loss field direction weight continue to participate in the formation process of the cable dielectric loss scalar. The technical essence of the dielectric loss characteristic coordinate axis is that it is a coordinate reference formed by the common change direction of dielectric loss response in historical power outage test samples, rather than the original amplitude of a single dielectric loss field directly serving as the coordinate reference.

[0016] Preferably, the specific implementation process of the step "performing principal component extraction on the cable polarization feature sequence to obtain the cable polarization scalar" is as follows: First, based on the time sampling correspondence results in the power outage test alignment record, a polarization test segment corresponding to the current power outage test time is extracted from the cable polarization feature sequence; the polarization test segment includes a polarization current decay field, a depolarization current recovery field, and a residual polarization characterization field. The polarization current decay field is used to characterize the decay state of the polarization current as the sampling time changes after the excitation is applied during the power outage test. The depolarization current recovery field is used to characterize the recovery state of the released charge of the insulation material after the excitation is removed. The residual polarization characterization field is used to characterize the residual polarization state that is not completely released under the same current power outage test time. Subsequently, the center value and discrete scale value of the polarization field in the preset multidimensional reference space are read. The center value of the polarization field is used to perform center offset processing on the corresponding field in the polarization test segment to form the polarization test center offset field value. Then, the discrete scale value of the polarization field is used to perform amplitude reduction processing on the polarization test center offset field value to form the polarization test specification field value. The polarization test specification field values ​​are arranged according to the sampling order in the polarization test segment to form a polarization feature specification sequence. The polarization feature specification sequence continues to enter the projection processing of the polarization feature coordinate axis, so that the polarization current attenuation field, depolarization current recovery field and residual polarization characterization field from different dimensions are first converted to the same field specification caliber, and then participate in the formation process of cable polarization scalar.

[0017] Preferably, after the polarization feature specification sequence is formed, the polarization test specification field value corresponding to the polarization feature coordinate axis is read from the polarization feature specification sequence according to the arrangement order of the polarization field of the polarization feature coordinate axis in the preset multidimensional reference space. The polarization test specification field value and the polarization field direction weight in the polarization feature coordinate axis are then subjected to a weight conversion process that preserves the direction, so as to form the polarization coordinate conversion field value. The polarization coordinate conversion field value retains the deviation direction of the polarization test specification field value relative to the center value of the polarization field, thus enabling the differentiation of different data change states such as enhanced insulation polarization response, weakened insulation polarization response, and delayed insulation polarization response recovery. Subsequently, according to the order of polarization fields in the polarization feature coordinate axes, the polarization coordinate conversion field values ​​are subjected to sequential cumulative encoding to form polarization principal component projection values. Then, the polarization principal component projection values ​​corresponding to different polarization feature coordinate axes are sorted by size. The polarization principal component projection value with the highest sorting position that represents the main polarization change direction at the time of the current power outage test is selected as the cable polarization scalar. The position of the polarization feature coordinate axis corresponding to the polarization principal component projection value in the sorting is configured as the polarization feature coordinate axis sorting position. The technical essence of the cable polarization scalar is a compressed expression of the polarization feature specification sequence in the common change direction of historical polarization responses. The cable polarization scalar retains the polarization response change direction while reducing the repetitive expression between multiple polarization response fields. Therefore, the cable polarization scalar can serve as the source of the amplitude of the subsequent cable polarization dimensionality reduction vector, and the sorting position of the polarization feature coordinate axes can serve as the source of the directional position of the subsequent cable polarization dimensionality reduction vector.

[0018] Preferably, the specific implementation process of the step "constructing a vectorized cable polarization scalar to generate a cable polarization dimension-reduced vector" is as follows: First, read the polarization feature coordinate axes used when forming the cable polarization scalar, the order of the polarization feature coordinate axes, the current power outage test time, and the cable identification of the cable to be evaluated, and write the above data into the polarization coordinate placeholder record; the polarization coordinate placeholder record is used to limit which type of coordinate position the cable polarization scalar should be written into in the cable polarization dimension-reduced vector, and to limit the source relationship between the cable polarization dimension-reduced vector and the cable polarization feature sequence. Subsequently, a polarization dimension-reduced vector template is established according to the order of the polarization feature coordinate axes pointed to by the polarization coordinate placeholder record; the elements in the polarization dimension-reduced vector template include polarization principal component amplitude placeholder elements, polarization principal component direction placeholder elements, polarization deviation polarity placeholder elements, and polarization time sequence placeholder elements. The cable polarization scalar is written into the polarization principal component amplitude placeholder element, the polarization feature coordinate axis sorting position is written into the polarization principal component direction placeholder element, the deviation direction of the cable polarization scalar relative to the center value of the polarization field is written into the polarization deviation polarity placeholder element, and the time sequence code after the current power outage test time conversion is written into the polarization time sequence placeholder element, thus forming a cable polarization dimension reduction vector. The technical essence of the cable polarization dimension reduction vector is to expand a cable polarization scalar with amplitude meaning into a low-dimensional polarization state expression with direction position, deviation polarity, and time sequence, so that the cable polarization dimension reduction vector can be continuously read and sequentially spliced ​​when generating the cable operation fingerprint sequence.

[0019] Preferably, the specific implementation process of the step "performing principal component extraction on the cable dielectric loss feature sequence to obtain the cable dielectric loss scalar" is as follows: First, based on the test condition correspondence results in the power outage test alignment record, a dielectric loss test segment corresponding to the current power outage test time is extracted from the cable dielectric loss feature sequence; the dielectric loss test segment includes a dielectric loss change field, a dielectric loss slope field, and a dielectric loss stability characterization field. The dielectric loss change field is used to characterize the change in the loss amplitude of the insulating medium under test excitation, the dielectric loss slope field is used to characterize the trend of the dielectric loss response changing with the test time, and the dielectric loss stability characterization field is used to characterize the degree of fluctuation of the dielectric loss response under the same current power outage test time. Subsequently, the center value and discrete scale value of the dielectric loss field in the preset multidimensional reference space are read. The center value of the dielectric loss field is used to perform center offset processing on the corresponding field in the dielectric loss test segment to form the dielectric loss test center offset field value. Then, the discrete scale value of the dielectric loss field is used to perform amplitude conversion processing on the dielectric loss test center offset field value to form the dielectric loss test specification field value. The dielectric loss test specification field values ​​are arranged according to the sampling order in the dielectric loss test segment to form the dielectric loss characteristic specification sequence. The dielectric loss characteristic specification sequence continues to enter the projection processing of the dielectric loss characteristic coordinate axis, so that the dielectric loss change field, dielectric loss slope field, and dielectric loss stability characterization field are first converted to the same field specification caliber, and then participate in the formation process of the cable dielectric loss scalar.

[0020] Preferably, after the dielectric loss characteristic specification sequence is formed, the dielectric loss test specification field value corresponding to the dielectric loss characteristic coordinate axis is read from the dielectric loss characteristic specification sequence according to the arrangement order of the dielectric loss field in the preset multidimensional reference space. The dielectric loss test specification field value and the dielectric loss field direction weight in the dielectric loss characteristic coordinate axis are then subjected to a weight conversion process that preserves the direction, so as to form the dielectric loss coordinate conversion field value. The dielectric loss coordinate conversion field value retains the deviation direction of the dielectric loss test specification field value relative to the center value of the dielectric loss field, thus enabling the differentiation of different data change states such as increased dielectric loss response, slowed dielectric loss response, and enhanced dielectric loss response fluctuation. Subsequently, according to the order of the dielectric loss fields in the dielectric loss characteristic coordinate axes, the values ​​of the dielectric loss coordinate conversion fields are subjected to sequential cumulative encoding to form the dielectric loss principal component projection values. Then, the dielectric loss principal component projection values ​​corresponding to different dielectric loss characteristic coordinate axes are sorted by size. The dielectric loss principal component projection value with the highest sorting position that can represent the main direction of dielectric loss change at the current power outage test time is selected as the cable dielectric loss scalar. The position of the dielectric loss characteristic coordinate axis corresponding to the dielectric loss principal component projection value in the sorting is configured as the sorting position of the dielectric loss characteristic coordinate axis. The technical essence of the cable dielectric loss scalar is a compressed expression of the dielectric loss characteristic specification sequence in the common direction of change of historical dielectric loss response. The cable dielectric loss scalar retains the direction and amplitude of dielectric loss response change, enabling the cable dielectric loss scalar to serve as the amplitude source of the subsequent cable dielectric loss dimensionality reduction vector, and the sorting position of the dielectric loss characteristic coordinate axes to serve as the directional position source of the subsequent cable dielectric loss dimensionality reduction vector.

[0021] Preferably, the specific technical implementation of the step "vectorizing the cable dielectric loss scalar to generate a cable dielectric loss dimension reduction vector" is as follows: First, read the dielectric loss characteristic coordinate axes used when forming the cable dielectric loss scalar, the sorting position of the dielectric loss characteristic coordinate axes, the current power outage test time, and the cable identification of the cable to be evaluated, and write the above data into the dielectric loss coordinate placeholder record; the dielectric loss coordinate placeholder record is used to limit which type of coordinate position the cable dielectric loss scalar should be written into in the cable dielectric loss dimension reduction vector, and to limit the source relationship between the cable dielectric loss dimension reduction vector and the cable dielectric loss characteristic sequence. Subsequently, a dielectric loss dimension reduction vector template is established according to the order of the dielectric loss characteristic coordinate axes pointed to by the dielectric loss coordinate placeholder record; the elements in the dielectric loss dimension reduction vector template include placeholder elements for the amplitude of the dielectric loss principal component, placeholder elements for the direction of the dielectric loss principal component, placeholder elements for the polarity deviation of the dielectric loss, and placeholder elements for the time sequence of the dielectric loss. The cable dielectric loss scalar is written into the amplitude placeholder element of the dielectric loss principal component, the sorting position of the dielectric loss feature coordinate axis is written into the direction placeholder element of the dielectric loss principal component, the deviation direction of the cable dielectric loss scalar relative to the center value of the dielectric loss field is written into the dielectric loss deviation polarity placeholder element, and the time sequence code after time conversion generated by the current power outage test is written into the dielectric loss time sequence placeholder element, thus forming a cable dielectric loss dimension reduction vector. The technical essence of the cable dielectric loss dimension reduction vector is to expand a cable dielectric loss scalar with amplitude meaning into a low-dimensional dielectric loss state expression with direction, deviation polarity, and time sequence, so that the cable dielectric loss dimension reduction vector can be time-paired with the cable polarization dimension reduction vector when generating the cable operation fingerprint sequence.

[0022] Preferably, the specific implementation process of the step "generating a cable operation fingerprint sequence based on the cable polarization dimension reduction vector and the cable dielectric loss dimension reduction vector" is as follows: First, read the time sampling correspondence results in the power outage test alignment record, and find the cable polarization dimension reduction vector and cable dielectric loss dimension reduction vector that belong to the same current power outage test generation time according to the time sampling correspondence results; then, perform consistency verification on the polarization time sequence placeholder element in the cable polarization dimension reduction vector and the dielectric loss time sequence placeholder element in the cable dielectric loss dimension reduction vector to form a fingerprint time pairing result; when the fingerprint time pairing result indicates that the cable polarization dimension reduction vector and the cable dielectric loss dimension reduction vector belong to the same current power outage test generation time, configure the current power outage test generation time as the cable test entry timestamp, and write the cable polarization dimension reduction vector, the cable dielectric loss dimension reduction vector, the cable identifier of the cable to be evaluated, and the cable test entry timestamp into the cable operation fingerprint unit. The cable operation fingerprint unit is used to carry the polarization state expression and dielectric loss state expression at the same current power outage test time; the cable operation fingerprint unit continues to participate in the time sequence splicing process, so that the cable operation fingerprint sequence can record the changes in the operation state of the cable to be evaluated in multiple power outage tests in time sequence.

[0023] Preferably, when forming a cable operation fingerprint unit, the cable polarization dimension reduction vector and the cable dielectric loss dimension reduction vector are entered into the cable operation fingerprint unit in a parallel encapsulation manner. The parallel encapsulation method includes writing the cable polarization dimension reduction vector into the polarization state field area, writing the cable dielectric loss dimension reduction vector into the dielectric loss state field area, writing the cable test recording timestamp into the timestamp field area, and writing the cable identifier of the cable to be evaluated into the cable source field area. The polarization state field area is used to retain the polarization principal component amplitude placeholder elements, polarization principal component direction placeholder elements, polarization deviation polarity placeholder elements, and polarization time sequence placeholder elements in the cable polarization dimension reduction vector; the dielectric loss state field area is used to retain the dielectric loss principal component amplitude placeholder elements, dielectric loss principal component direction placeholder elements, dielectric loss deviation polarity placeholder elements, and dielectric loss time sequence placeholder elements in the cable dielectric loss dimension reduction vector. By configuring the polarization state field and the dielectric loss state field in parallel, the cable operation fingerprint unit does not perform direct subtraction, direct multiplication, or source-indistinguished numerical superposition of the cable polarization dimension reduction vector and the cable dielectric loss dimension reduction vector, thereby avoiding the formation of uninterpretable mixed fields due to the different physical meanings of polarization response and dielectric loss response.

[0024] Preferably, after multiple cable operation fingerprint units are formed, the cable test entry timestamps in each cable operation fingerprint unit are first read, and the cable test entry timestamps are sorted chronologically to form a fingerprint unit sorting record. The fingerprint unit sorting record is used to record the time position of each cable operation fingerprint unit during the continuous power outage test of the cable to be evaluated. Subsequently, according to the fingerprint unit sorting record, multiple cable operation fingerprint units are spliced ​​chronologically to generate a cable operation fingerprint sequence. Each sequence position in the cable operation fingerprint sequence corresponds to a cable operation fingerprint unit, and each cable operation fingerprint unit includes a polarization state field area, a dielectric loss state field area, a timestamp field area, and a cable origin field area. Therefore, when performing segmented tracking processing on the cable operation fingerprint sequence later, the polarization state field area and the dielectric loss state field area can be read along the cable test entry timestamp, and cable degradation characteristic indicators can be formed accordingly.

[0025] Preferably, in one scenario, the cable to be evaluated is a power cable that has undergone multiple operating cycles after being laid underground. The cable polarization feature sequence is derived from the polarization current attenuation field, depolarization current recovery field, and residual polarization characterization field recorded during the power outage test. The cable dielectric loss feature sequence is derived from the dielectric loss change field, dielectric loss slope field, and dielectric loss stability characterization field recorded during the same power outage test. When processing this underground power cable, the cable polarization feature sequence and cable dielectric loss feature sequence are first aligned with the records of the power outage test to ensure that they are from the same cable source, under the same current power outage test time, and under the same test conditions. Then, the cable polarization scalar and cable dielectric loss scalar are extracted using the polarization feature coordinate axis and the dielectric loss feature coordinate axis, respectively. Subsequently, a cable polarization dimension reduction vector is constructed based on the cable polarization scalar, and a cable dielectric loss dimension reduction vector is constructed based on the cable dielectric loss scalar. Finally, the cable polarization dimension reduction vector and cable dielectric loss dimension reduction vector are configured into the same cable operation fingerprint unit using the cable test entry timestamp, and multiple cable operation fingerprint units are spliced ​​in chronological order to form a cable operation fingerprint sequence. This processing method differs from the forward judgment method that only judges the limits of partial discharge signals or temperature signals. Its core lies in first extracting the cable polarization dimension reduction vector and the cable dielectric loss dimension reduction vector from the power outage test data, and then using the cable test recording timestamp to organize the cable polarization dimension reduction vector and the cable dielectric loss dimension reduction vector into a traceable cable operation fingerprint sequence, thereby providing a data foundation for generating cable degradation feature indicators through the cable operation fingerprint sequence.

[0026] Optionally, principal component extraction is performed on the cable polarization feature sequence to obtain a cable polarization scalar; the cable polarization scalar is then vectorized to generate a cable polarization dimension-reduced vector, including: retrieving a preset multidimensional reference space corresponding to the cable to be evaluated, the preset multidimensional reference space being pre-configured based on the cable polarization reference feature sequence and cable dielectric loss reference feature sequence from historical power outage test samples of the same type of cable; projecting the cable polarization feature sequence onto the preset multidimensional reference space for principal component extraction to obtain the cable polarization scalar; mapping the cable polarization scalar to the feature coordinate axes corresponding to the preset multidimensional reference space for vectorization to generate the cable polarization dimension-reduced vector.

[0027] Preferably, the specific implementation process of the step "retrieving the preset multi-dimensional reference space corresponding to the cable to be evaluated" is as follows: First, read the cable identification of the cable to be evaluated, and then read the cable type mark, insulation material type mark, voltage level mark, laying environment mark, and power outage test caliber mark of the cable to be evaluated based on the cable identification; subsequently, write the cable type mark, insulation material type mark, voltage level mark, laying environment mark, and power outage test caliber mark into the cable type attribution record. The cable type attribution record is used to record the screening criteria for calling historical power outage test samples for the cable to be evaluated. Among them, the cable type mark is used to limit the cable structure category, the insulation material type mark is used to limit the insulation layer material category, the voltage level mark is used to limit the cable voltage level caliber used during power outage testing, the laying environment mark is used to limit the laying environment source such as underground laying, trench laying, or pipe gallery laying, and the power outage test caliber mark is used to limit the sampling caliber for polarization testing and dielectric loss testing. Subsequently, preset sample screening conditions are configured based on the cable type attribution record. These conditions include cable type consistency, insulation material type consistency, voltage level consistency, laying environment consistency, power outage test caliber consistency, and sample field integrity. These preset screening conditions are then used to select historical power outage test samples from a pre-stored historical power outage test sample library. Based on these conditions, historical power outage test samples belonging to the same type as the cable to be evaluated are extracted from the library and written into the historical sample candidate record. This historical sample candidate record then undergoes sample validation to generate historical sample screening records that can be used to configure a preset multi-dimensional reference space.

[0028] Preferably, after the historical sample candidate record is formed, sample verification processing is performed on each historical power outage test sample in the historical sample candidate record: First, the sample cable identifier in the historical power outage test sample is read, and the sample cable type mark, sample insulation material type mark, sample voltage level mark, sample laying environment mark, and sample power outage test diameter mark corresponding to the historical power outage test sample are read according to the sample cable identifier; then, the sample cable type mark is verified to correspond with the cable type mark to form a cable type consistency verification result; the sample insulation material type mark is verified to correspond with the insulation material type mark to form an insulation material type consistency verification result; the sample voltage level mark is verified to correspond with the voltage level mark to form a voltage level consistency verification result; the sample laying environment mark is verified to correspond with the laying environment mark to form a laying environment consistency verification result; the sample power outage test diameter mark is verified to correspond with the power outage test diameter mark to form a power outage test diameter consistency verification result; then, the cable type consistency verification result, insulation material type consistency verification result, voltage level consistency verification result, laying environment consistency verification result, and power outage test diameter consistency verification result are written into the sample type verification result. Subsequently, the sample test time field, sample test condition field, and sample field integrity flag are read from the historical power outage test samples. The sample test time field undergoes time format verification to generate a sample test time field verification result; the sample test condition field undergoes condition field consistency verification to generate a sample test condition field verification result; and the sample field integrity flag undergoes field missing verification to generate a sample field integrity verification result. The sample test time field verification result, sample test condition field verification result, and sample field integrity verification result are then written into the sample availability verification result. Historical power outage test samples whose sample type verification result and sample availability verification result both meet the preset sample screening conditions are written into the historical sample screening record. The historical sample screening record is further used to extract cable polarization reference characteristic sequences and cable dielectric loss reference characteristic sequences, thus limiting the source of the preset multidimensional reference space to historical power outage test samples that have the same power outage test caliber marking as the cable to be evaluated and meet the sample field integrity conditions.

[0029] Preferably, the preset multidimensional reference space is pre-configured based on historical sample screening records. The technical essence of the preset multidimensional reference space is a data reference space used to carry the field specification standards, field change references, and field direction references for historical power outage test samples of the same type of cable. Specifically, the preset multidimensional reference space includes a polarization reference field timetable, a dielectric loss reference field timetable, reference field source records, a polarization reference specification field timetable, a dielectric loss reference specification field timetable, polarization field association records, polarization candidate direction records, and polarization characteristic coordinate axes. The polarization reference field timetable is derived from the cable polarization reference feature sequence, and the dielectric loss reference field timetable is derived from the cable dielectric loss reference feature sequence. The reference field source record is used to record the common sample source between the polarization reference field timetable and the dielectric loss reference field timetable. The polarization reference specification field timetable is used to provide field specification standards for the field specification processing of the cable polarization feature sequence. The dielectric loss reference specification field timetable is used to limit the dielectric loss response reference of historical power outage test samples in the preset multi-dimensional reference space under the same power outage test standard label. The polarization field association record is used to provide field change reference for the polarization candidate direction record. The polarization candidate direction record is used to provide field direction reference for the polarization feature coordinate axis. The polarization feature coordinate axis is further used for the projection processing, principal component extraction processing, and mapping processing of the cable polarization feature sequence.

[0030] Preferably, during the pre-configuration process of historical power outage test samples entering the preset multi-dimensional reference space, historical power outage test samples that have passed sample verification are first read from the historical sample screening record, and cable polarization reference feature sequences are extracted from each historical power outage test sample. The technical essence of the cable polarization reference feature sequence is the polarization response data sequence formed by cables of the same type during historical power outage tests. It is used to express the response changes of the insulation material during the excitation application stage, excitation removal stage, and charge residue stage. The polarization response data sequence is processed by subsequent field expansion and enters the polarization reference field timetable, and continues to participate in the formation process of the polarization reference specification field timetable and polarization feature coordinate axes through the polarization reference field timetable. The cable polarization reference feature sequence includes a polarization current attenuation reference field, a depolarization current recovery reference field, and a residual polarization reference field. The polarization current attenuation reference field is used to express the response state of the polarization current decreasing with sampling time in the historical power outage test sample; the depolarization current recovery reference field is used to express the recovery state of the insulation material releasing charge in the historical power outage test sample; and the residual polarization reference field is used to express the residual polarization state that was not completely released in the historical power outage test sample. Subsequently, a correspondence is established between the cable polarization reference feature sequence and the corresponding sample test time field, sample test condition field, and sample cable identifier to form a cable polarization reference feature sequence source record. The cable polarization reference feature sequence source record continues to participate in the formation process of the polarization reference field timetable, so that the polarization reference field timetable can retain which historical power outage test sample and which sample test time field the cable polarization reference feature sequence comes from.

[0031] Preferably, while extracting the cable polarization reference characteristic sequence, a cable dielectric loss reference characteristic sequence is extracted from the same historical power outage test sample. The technical essence of the cable dielectric loss reference characteristic sequence is a sequence of dielectric loss response data formed during historical power outage tests of the same type of cable. It is used to express the changes in energy loss, dielectric loss trend, and dielectric loss fluctuation of the insulation material under test excitation. The dielectric loss response data sequence is processed through subsequent field expansion and enters the dielectric loss reference field timetable, and continues to participate in the formation process of the dielectric loss reference specification field timetable and reference field source record through the dielectric loss reference field timetable. The cable dielectric loss reference characteristic sequence includes a dielectric loss change reference field, a dielectric loss slope reference field, and a dielectric loss stability reference field. The dielectric loss change reference field is used to express the change in the amplitude of insulation dielectric loss in the historical power outage test sample; the dielectric loss slope reference field is used to express the trend of the dielectric loss response changing with test time in the historical power outage test sample; and the dielectric loss stability reference field is used to express the fluctuation of the dielectric loss response under the same power outage test caliber in the historical power outage test sample. Subsequently, a correspondence is established between the cable dielectric loss reference characteristic sequence and the corresponding sample test time field, sample test condition field, and sample cable identifier to form a source record for the cable dielectric loss reference characteristic sequence. This source record continues to participate in the formation process of the dielectric loss reference field timetable and establishes a common sample source relationship with the cable polarization reference characteristic sequence source record through the reference field source record. This common sample source relationship continues to define the sample boundaries and power outage test caliber boundaries of the preset multidimensional reference space, ensuring that the cable dielectric loss reference characteristic sequence does not directly replace the cable polarization reference characteristic sequence, but rather jointly defines the sample source of the preset multidimensional reference space with it.

[0032] Preferably, the polarization reference field schedule is formed as follows: First, the sample cable identifier and sample test time fields in the cable polarization reference feature sequence source record are read, and polarization reference record rows are established according to the combination of the sample cable identifier and sample test time fields; then, polarization reference field columns are established according to the pre-configured polarization reference field name order. The polarization reference field name order is pre-configured based on the field names in the cable polarization reference feature sequence, and includes the polarization current attenuation reference field name, depolarization current recovery reference field name, and residual polarization reference field name; the polarization reference field name order is further used to define the column arrangement relationship of the polarization reference field columns. The polarization reference field column includes a polarization current attenuation reference field column, a depolarization current recovery reference field column, and a residual polarization reference field column. The polarization current attenuation reference field from the cable polarization reference feature sequence is then written into the polarization current attenuation reference field column, the depolarization current recovery reference field from the cable polarization reference feature sequence is written into the depolarization current recovery reference field column, and the residual polarization reference field from the cable polarization reference feature sequence is written into the residual polarization reference field column to form a polarization reference field schedule. Each row of the polarization reference field schedule corresponds to a polarization reference record formed by a historical power outage test sample under a sample test time field. Each column of the polarization reference field schedule corresponds to a polarization reference field. The intersection of rows and columns in the polarization reference field schedule is written with the polarization reference field value of the historical power outage test sample under that sample test time field. The polarization reference field schedule is further used to form the polarization field center value, the polarization field discrete scale value, and the polarization reference specification field schedule.

[0033] Preferably, the dielectric loss reference field schedule is formed as follows: First, the sample cable identifier and sample test time fields in the source record of the cable dielectric loss reference characteristic sequence are read, and dielectric loss reference record rows are established according to the combination of the sample cable identifier and sample test time fields; then, dielectric loss reference field columns are established according to the pre-configured order of dielectric loss reference field names. The order of dielectric loss reference field names is pre-configured according to the field names in the cable dielectric loss reference characteristic sequence, and includes the dielectric loss change reference field name, dielectric loss slope reference field name, and dielectric loss stability reference field name; the order of dielectric loss reference field names is further used to define the column arrangement relationship of the dielectric loss reference field columns. The dielectric loss reference field columns include the dielectric loss change reference field column, the dielectric loss slope reference field column, and the dielectric loss stability reference field column; then, the dielectric loss change reference field in the cable dielectric loss reference characteristic sequence is written into the dielectric loss change reference field column, the dielectric loss slope reference field in the cable dielectric loss reference characteristic sequence is written into the dielectric loss slope reference field column, and the dielectric loss stability reference field in the cable dielectric loss reference characteristic sequence is written into the dielectric loss stability reference field column to form the dielectric loss reference field schedule. Each row of the dielectric loss reference field timetable corresponds to a dielectric loss reference record formed by a historical power outage test sample under a sample test time field. Each column of the dielectric loss reference field timetable corresponds to a dielectric loss reference field. The dielectric loss reference field value of the historical power outage test sample under the sample test time field is written at the intersection of the row and column of the dielectric loss reference field timetable. The dielectric loss reference field timetable is further used to form the dielectric loss field center value, the dielectric loss field discrete scale value, and the dielectric loss reference specification field timetable.

[0034] Preferably, the reference field source record is formed as follows: First, the polarization reference record line in the polarization reference field timetable is read, and then the dielectric loss reference record line in the dielectric loss reference field timetable is read; subsequently, polarization reference record lines with the same sample cable identifier and the same sample test time field are paired with dielectric loss reference record lines to form a reference field pairing record. Then, the sample cable identifier, sample test time field, polarization reference record line identifier, and dielectric loss reference record line identifier from the reference field pairing record are written into the reference field source record. The reference field source record is used to record the common sample source of the cable polarization reference feature sequence and the cable dielectric loss reference feature sequence in a preset multi-dimensional reference space; when configuring the polarization feature coordinate axis subsequently, the reference field source record is read to exclude polarization reference record lines that lack the corresponding dielectric loss reference record line for the same historical power outage test sample, thereby ensuring that the historical power outage test sample corresponding to the polarization feature coordinate axis simultaneously has both polarization response reference and dielectric loss response reference. The reference field source record is also used to maintain the polarization reference specification field timetable and the dielectric loss reference specification field timetable under the same sample cable identifier and the same sample test time field, so that when the subsequent cable polarization characteristic sequence is projected to the preset multidimensional reference space, the preset multidimensional reference space still retains the common sample source relationship.

[0035] Preferably, after the polarization reference field schedule is formed, reference field specification processing is performed on the polarization reference field schedule: First, the polarization current attenuation reference field column in the polarization reference field schedule is read column by column. The values ​​of multiple polarization reference fields in the polarization current attenuation reference field column are sorted by size, and the polarization reference field value corresponding to the middle position of the sort is read to form the center value of the polarization field corresponding to the polarization current attenuation reference field column. Subsequently, the center values ​​of the polarization fields corresponding to the depolarization current recovery reference field column and the center values ​​of the polarization field corresponding to the residual polarization reference field column are formed in the same way. Then, the center value of the polarization field corresponding to each type of polarization reference field is read, and the deviation of each polarization reference field value in the same type of polarization reference field from the center value of the corresponding polarization field is used to form the discrete scale value of the polarization field corresponding to that polarization reference field. The discrete scale value of the polarization field is used to record the dispersion of the same type of polarization reference field in the historical power outage test samples of the same type of cable. The polarization field center value and polarization field discrete scale value are used for field standardization processing of the polarization reference field timetable, and also for subsequent field standardization processing of the cable polarization characteristic sequence. Both the polarization field center value and polarization field discrete scale value are written into a preset multi-dimensional reference space, so that when the preset multi-dimensional reference space is read later, the standard references corresponding to the polarization current attenuation reference field column, the depolarization current recovery reference field column, and the residual polarization reference field column can be obtained respectively.

[0036] Preferably, after forming the polarization field center value and the polarization field discrete scale value, the corresponding polarization reference field value in the polarization reference field timetable is center-offset using the polarization field center value corresponding to each polarization reference field to form a polarization center-offset field value. This polarization center-offset field value expresses the direction and magnitude of the deviation of the corresponding polarization reference field value relative to the polarization field center value. Subsequently, the corresponding polarization center-offset field value is amplitude-reduced using the polarization field discrete scale value corresponding to each polarization reference field to form a polarization reference specification field value. This polarization reference specification field value expresses the relative deviation of the corresponding polarization reference field value under the same field specification caliber. Finally, according to the row and column positions in the polarization reference field timetable, the polarization reference specification field values ​​are backfilled into the corresponding polarization reference record rows and corresponding polarization reference field columns to form the polarization reference specification field timetable. The polarization reference specification field schedule retains the sample cable identifier, sample test time field, and polarization reference field column from the polarization reference specification field schedule, while converting the original polarization reference field values ​​into polarization reference specification field values. Therefore, the polarization reference specification field schedule can continue to participate in the formation process of polarization field association records and continue to provide field specification standards for the field specification processing of cable polarization feature sequences.

[0037] Preferably, after the dielectric loss reference field schedule is formed, reference field specification processing is performed on the schedule: First, the dielectric loss change reference field column in the schedule is read column by column. Multiple dielectric loss reference field values ​​in the dielectric loss change reference field column are sorted by size, and the dielectric loss reference field value corresponding to the middle position of the sort is read to form the dielectric loss field center value corresponding to the dielectric loss change reference field column. Then, the dielectric loss field center values ​​corresponding to the dielectric loss slope reference field column and the dielectric loss stability reference field column are formed in the same way. Next, the dielectric loss field center value corresponding to each type of dielectric loss reference field is read, and based on the deviation of each dielectric loss reference field value from the corresponding dielectric loss field center value, a dielectric loss field discrete scale value corresponding to that dielectric loss reference field is formed. The dielectric loss field discrete scale value is used to record the dispersion of the same dielectric loss reference field in historical power outage test samples of the same type of cable. The media loss field center value and media loss field discrete scale value are used to perform field normalization processing on the media loss reference field timetable, and are further written into the preset multidimensional reference space to limit the media loss response specification reference of the preset multidimensional reference space. Both the media loss field center value and the media loss field discrete scale value are written into the preset multidimensional reference space, so that when the preset multidimensional reference space is read subsequently, the media loss response specification reference corresponding to the media loss change reference field column, the media loss slope reference field column, and the media loss stability reference field column can be obtained respectively.

[0038] Preferably, after forming the center value and discrete scale value of the dielectric loss field, the center value of the corresponding dielectric loss reference field in the dielectric loss reference field timetable is offset using the center value of the dielectric loss field corresponding to each dielectric loss reference field to form a dielectric loss center offset field value. The dielectric loss center offset field value is used to express the direction and magnitude of the deviation of the corresponding dielectric loss reference field value relative to the center value of the dielectric loss field. Subsequently, the amplitude conversion processing of the corresponding dielectric loss center offset field value is performed using the discrete scale value of the dielectric loss field corresponding to each dielectric loss reference field to form a dielectric loss reference specification field value. The dielectric loss reference specification field value is used to express the relative deviation state of the corresponding dielectric loss reference field value under the same field specification caliber. Then, according to the row and column positions in the dielectric loss reference field timetable, the dielectric loss reference specification field values ​​are backfilled into the corresponding dielectric loss reference record rows and corresponding dielectric loss reference field columns to form the dielectric loss reference specification field timetable. The dielectric loss reference specification field timetable and the polarization reference specification field timetable are jointly written into the preset multidimensional reference space. The dielectric loss reference specification field timetable limits the common sample source of the polarization reference specification field timetable through the reference field source record, so that when the subsequent cable polarization characteristic sequence is projected onto the preset multidimensional reference space, the preset multidimensional reference space still maintains the consistent sample source of polarization response reference and dielectric loss response reference.

[0039] Preferably, after the polarization reference specification field timetable is formed, any two polarization reference fields in the polarization reference specification field timetable are read, and the polarization reference specification field values ​​corresponding to the two polarization reference fields under the same sample cable identifier and the same sample test time field are read. Subsequently, the polarization reference specification field values ​​corresponding to the two polarization reference fields are compared in terms of change direction to form a polarization field direction comparison result. The polarization field direction comparison result includes a same-direction change marker, a opposite-direction change marker, and a magnitude proximity marker. The same-direction change marker is used to record that the two polarization reference fields deviate in the same polarization reference record line from their respective polarization field center values ​​in the same polarization reference record line ... The polarization field association record is used to record the degree of similarity, degree of oppositeity, and magnitude of change of the two polarization reference fields in multiple historical power outage test samples; the polarization field association record is further used to form polarization candidate direction records.

[0040] Preferably, after forming polarization field association records, the combinations of polarization reference fields with high degrees of same-direction or opposite-direction change in the polarization field association records are first read, and polarization candidate field groups are formed according to the names of the polarization reference fields in the combinations. Then, the polarization reference fields in the polarization candidate field groups are arranged according to the strength of the field association between each polarization reference field and other polarization reference fields to form a polarization field arrangement order. Next, based on the same-direction and opposite-direction change in the polarization field association records, polarization field direction weights are configured for each polarization reference field in the polarization field arrangement order to form polarization candidate direction records. The polarization candidate direction records include the polarization field arrangement order and polarization field direction weights; the polarization field arrangement order is used to limit the reading order of each polarization test specification field value during subsequent projection processing, and the polarization field direction weights are used to limit the contribution direction of each polarization test specification field value in the common change direction of the same polarization response during subsequent projection processing. Then, based on the number of polarization reference fields covered by the polarization candidate direction records, the degree of same-direction change corresponding to the polarization candidate direction records, and the degree of opposite-direction change corresponding to the polarization candidate direction records, the multiple polarization candidate direction records are sorted, and the sorted polarization candidate direction records are configured as polarization feature coordinate axes. The polarization feature coordinate axes belong to the feature coordinate axes corresponding to a preset multi-dimensional reference space. The technical essence of the feature coordinate axes is a data direction reference formed by historical power outage test samples of the same type of cable. It is used to undertake the projection processing of subsequent cable polarization feature sequences and the mapping processing of cable polarization scalars. The polarization feature coordinate axes retain the arrangement order and polarization field direction weights in the polarization candidate direction records, so that when subsequent cable polarization feature sequences enter the polarization feature coordinate axes, projection processing can be performed according to the same field reading order and the same contribution direction.

[0041] Preferably, the specific implementation process of the step "projecting the cable polarization feature sequence onto a preset multi-dimensional reference space for principal component extraction" is as follows: First, based on the power outage test generation time of the cable polarization feature sequence generated during the power outage test, a polarization test segment is extracted from the cable polarization feature sequence. The polarization test segment includes a polarization current attenuation field, a depolarization current recovery field, and a residual polarization characterization field; the polarization current attenuation field corresponds to the polarization current attenuation reference field, the depolarization current recovery field corresponds to the depolarization current recovery reference field, and the residual polarization characterization field corresponds to the residual polarization reference field. Subsequently, the center value and discrete scale value of the polarization field in the preset multidimensional reference space are read. The polarization current attenuation field is then offset using the center value of the polarization field corresponding to the polarization current attenuation reference field to form a polarization current attenuation center offset field value. The polarization current attenuation center offset field value is then subjected to amplitude reduction using the discrete scale value of the polarization field corresponding to the polarization current attenuation reference field to form a polarization current attenuation specification field value. Following the same field correspondence method, the depolarization current recovery field is offset using the center value of the polarization field corresponding to the depolarization current recovery reference field. The polarization current recovery center offset field value is generated by performing a process to form a depolarization current recovery reference field value. The amplitude of this field value is then reduced using the discrete scale value of the polarization field corresponding to the depolarization current recovery reference field value to form a depolarization current recovery specification field value. Next, the center value of the residual polarization characterization field is used to perform a center offset process on the residual polarization characterization field value to form a residual polarization characterization center offset field value. The amplitude of this field value is then reduced using the discrete scale value of the polarization field corresponding to the residual polarization reference field value to form a residual polarization characterization specification field value. The polarization current attenuation specification field value, depolarization current recovery specification field value, and residual polarization characterization specification field value are rearranged according to the polarization field arrangement order on the polarization feature coordinate axis to form a polarization test specification field sequence. This sequence is then projected onto the polarization feature coordinate axis.

[0042] Preferably, when the polarization test specification field sequence is projected onto the polarization feature coordinate axis, the polarization field arrangement order in one polarization feature coordinate axis is read first, and the polarization test specification field values ​​in the polarization test specification field sequence are read item by item according to the polarization field arrangement order. Subsequently, the polarization field direction weights corresponding to each polarization reference field in the polarization field arrangement order are read, and the corresponding polarization test specification field values ​​are subjected to direction-preserving field conversion processing according to the polarization field direction weights to form polarization coordinate conversion field values. The direction-preserving field conversion processing includes direction retention processing and direction flipping processing; the direction retention processing is used to retain the deviation direction of the corresponding polarization test specification field value when the polarization field direction weights represent the same direction of contribution, and the direction flipping processing is used to flip the deviation direction of the corresponding polarization test specification field value when the polarization field direction weights represent the opposite direction of contribution. When the polarization field direction weights represent the same contribution direction, the corresponding polarization test specification field value is preserved in its direction to form the corresponding polarization coordinate transformation field value. When the polarization field direction weights represent the opposite contribution direction, the corresponding polarization test specification field value is reversed in its direction to form the corresponding polarization coordinate transformation field value. The polarization coordinate transformation field value retains the deviation direction of the polarization test specification field value relative to the center value of the polarization field, while transforming the polarization test specification field value to the common direction of change of the polarization feature coordinate axes. Multiple polarization coordinate transformation field values ​​continue to participate in sequential cumulative encoding processing to form the polarization principal component projection value.

[0043] Preferably, the polarization principal component projection values ​​are formed as follows: First, multiple polarization coordinate transformation field values ​​are read according to the polarization field arrangement order, and then these values ​​are sequentially written to form a polarization coordinate transformation field value sequence. Subsequently, sequential cumulative encoding is performed on the polarization coordinate transformation field value sequence to form the polarization principal component projection values. Sequential cumulative encoding refers to accumulating the directionally consistent portions of the multiple polarization coordinate transformation field values ​​according to the polarization field arrangement order, and subtracting the directionally inconsistent portions, so that the polarization principal component projection values ​​can represent the overall projection state of the polarization test segment on a single polarization feature coordinate axis. Sequential cumulative encoding is performed on each polarization feature coordinate axis to form the polarization principal component projection value corresponding to each axis. The multiple polarization principal component projection values ​​then undergo sorting to form a sorted record of the polarization principal component projection values. The polarization principal component projection value sorting record is used to record the polarization characteristic coordinate axis, polarization candidate direction record, and sorting position corresponding to each polarization principal component projection value. The polarization principal component projection value sorting record is then used to determine the cable polarization scalar.

[0044] Preferably, after forming multiple polarization principal component projection values, the polarization feature coordinate axis corresponding to each polarization principal component projection value is first read, and the polarization candidate direction record corresponding to that polarization feature coordinate axis is also read. Then, the polarization principal component projection values ​​are sorted according to the deviation magnitude of the polarization principal component projection values, the number of polarization reference fields covered by the polarization candidate direction record, and the degree of same-direction change corresponding to the polarization candidate direction record, to form a polarization principal component projection value sorting record. Next, the polarization principal component projection values ​​with the highest sorting position are read from the polarization principal component projection value sorting record, and the read polarization principal component projection values ​​are used as cable polarization scalars. Simultaneously, the polarization feature coordinate axis corresponding to the cable polarization scalar, the polarization candidate direction record corresponding to the cable polarization scalar, the sorting position corresponding to the cable polarization scalar, the power outage test time, and the cable identification of the cable to be evaluated are written into the polarization scalar source record. The technical essence of cable polarization scalars is a low-dimensional compression of the cable polarization characteristic sequence along the common direction of change in the historical polarization responses of cables of the same type. Cable polarization scalars are not simply summed or averaged from the polarization current attenuation field, depolarization current recovery field, and residual polarization characterization field; rather, they are single state quantities that retain the main polarization change directions within a pre-defined multi-dimensional reference space. The polarization scalar source record continues to be used for the mapping processing of cable polarization scalars.

[0045] Preferably, after the cable polarization scalar is formed, the polarization feature coordinate axis corresponding to the cable polarization scalar is first read from the polarization scalar source record, and this polarization feature coordinate axis is determined as the mapping position of the cable polarization scalar in the feature coordinate axis corresponding to the preset multi-dimensional reference space. Subsequently, the polarization candidate direction record corresponding to the cable polarization scalar is read from the polarization scalar source record, and the polarization field arrangement order and polarization field direction weight are read from the polarization candidate direction record to form a polarization mapping aperture record. Then, the sorting position, power outage test generation time, and cable identification of the cable to be evaluated corresponding to the cable polarization scalar are read from the polarization scalar source record, and the cable polarization scalar, mapping position, polarization mapping aperture record, sorting position, power outage test generation time, and cable identification of the cable to be evaluated are written into the polarization coordinate placeholder record. The polarization coordinate placeholder record is used to define the writing position and source path of the cable polarization scalar in the subsequent vectorization construction process. This ensures that when the cable polarization scalar enters the cable polarization dimension reduction vector from a single state variable, it retains the polarization feature coordinate axis from which it originated, the order of the polarization fields, the polarization field direction weights, and the corresponding power outage test time. The polarization coordinate placeholder record is further used to build the polarization dimension reduction vector template and to write the cable polarization scalar into the corresponding placeholder element of the cable polarization dimension reduction vector.

[0046] Preferably, in the specific technical implementation of the step "mapping the cable polarization scalar to the feature coordinate axes corresponding to the preset multidimensional reference space for vectorization construction processing", a polarization dimensionality reduction vector template is first established based on the polarization coordinate placeholder record. The polarization dimensionality reduction vector template includes polarization principal component amplitude placeholder elements, polarization principal component direction placeholder elements, polarization deviation polarity placeholder elements, polarization field diameter placeholder elements, polarization weight diameter placeholder elements, and polarization time sequence placeholder elements. The polarization principal component amplitude placeholder element is used to write the cable polarization scalar, the polarization principal component direction placeholder element is used to write the sorting position corresponding to the cable polarization scalar, the polarization deviation polarity placeholder element is used to write the deviation direction of the cable polarization scalar relative to the center value of the polarization field, the polarization field diameter placeholder element is used to write the arrangement order of the polarization fields participating in the formation of the cable polarization scalar, the polarization weight diameter placeholder element is used to write the polarization field direction weights participating in the formation of the cable polarization scalar, and the polarization time sequence placeholder element is used to write the time sequence code corresponding to the power outage test time. Each placeholder element in the polarization dimension reduction vector template originates from the polarization coordinate placeholder record, polarization feature coordinate axis, or power outage test time. Therefore, the polarization dimension reduction vector template is a data carrier format corresponding to the source, direction, deviation state, field caliber, weight caliber, and time position of the cable polarization scalar. The polarization dimension reduction vector template is then used to perform vectorization construction processing.

[0047] Preferably, after the polarization dimensionality reduction vector template is formed, vectorization construction processing is performed according to the order of the placeholder elements in the polarization dimensionality reduction vector template: first, the cable polarization scalar is written into the polarization principal component amplitude placeholder element to retain the amplitude meaning of the cable polarization scalar; then, the sorting position corresponding to the cable polarization scalar is written into the polarization principal component direction placeholder element to retain the directional position of the cable polarization scalar in the feature coordinate axis corresponding to the preset multidimensional reference space; subsequently, the deviation direction of the cable polarization scalar relative to the center value of the polarization field is written into the polarization deviation polarity placeholder element to retain the cable polarization scalar's directional position in the feature coordinate axis corresponding to the preset multidimensional reference space. The polarization scalar represents the enhanced polarization response state, weakened polarization response state, or delayed polarization response recovery state. Next, the order of polarization fields participating in the formation of the cable polarization scalar is written into the polarization field diameter placeholder element, and the polarization field direction weights participating in the formation of the cable polarization scalar are written into the polarization weight diameter placeholder element to preserve the field and weight sources of the cable polarization scalar. Finally, the time sequence code corresponding to the power outage test time is written into the polarization time sequence placeholder element to preserve the time position of the cable polarization scalar during continuous power outage tests. These placeholder elements together form the cable polarization dimension reduction vector. The technical essence of the cable polarization dimension reduction vector is to expand the cable polarization scalar from a single amplitude state to a low-dimensional polarization state expression that simultaneously includes amplitude, direction, deviation polarity, field diameter, weight diameter, and time position. The cable polarization dimension reduction vector is then used together with the cable dielectric loss dimension reduction vector to generate the cable operation fingerprint sequence.

[0048] Preferably, in one scenario, the cable to be evaluated is a power cable that has undergone multiple operating cycles after being laid underground. The cable polarization characteristic sequence includes the polarization current attenuation field, depolarization current recovery field, and residual polarization characterization field formed by the power cable during the power outage test. The preset multidimensional reference space is pre-configured based on the cable polarization reference characteristic sequence and cable dielectric loss reference characteristic sequence in the historical power outage test samples of the same type of cable. When processing this power cable, historical samples are first used to screen and determine historical outage test samples that can be used as references. Then, a polarization reference specification field timetable is formed from the cable polarization reference feature sequence, and a polarization feature coordinate axis is formed from the polarization reference specification field timetable. Subsequently, the cable polarization feature sequence is processed according to the polarization field center value and the polarization field discrete scale value to form a polarization test specification field sequence. Then, the polarization test specification field sequence is projected onto the polarization feature coordinate axis to form polarization principal component projection values, and a cable polarization scalar is formed based on the polarization principal component projection values. Finally, the cable polarization scalar is mapped to the corresponding placeholder position on the polarization feature coordinate axis to form a cable polarization dimensionality reduction vector. This processing method differs from the method of directly using the original polarization test fields for threshold judgment. It converts the cable polarization feature sequence into a cable polarization dimensionality reduction vector with historical reference sources of similar cables. This allows the generation of the cable operation fingerprint sequence based on the cable polarization dimensionality reduction vector and the cable dielectric loss dimensionality reduction vector to read the amplitude change, direction change, field source, weight source, and time position on the polarization side.

[0049] Optionally, principal component extraction is performed on the cable dielectric loss feature sequence to obtain a cable dielectric loss scalar; the cable dielectric loss scalar is then vectorized to generate a dimensionality-reduced cable dielectric loss vector, including: The cable dielectric loss characteristic sequence is projected onto a preset multidimensional reference space for principal component extraction to obtain the cable dielectric loss scalar. The cable dielectric loss scalar is mapped to the feature coordinate axes corresponding to the preset multidimensional reference space for vectorization construction, thereby generating a dimensionality-reduced vector of cable dielectric loss.

[0050] Preferably, the specific implementation process of the step "projecting the cable dielectric loss feature sequence to a preset multidimensional reference space for principal component extraction" is as follows: First, read the preset multidimensional reference space corresponding to the cable to be evaluated, and read the dielectric loss reference field timetable, dielectric loss reference specification field timetable, dielectric loss field center value, dielectric loss field discrete scale value, dielectric loss field association record, dielectric loss candidate direction record, and dielectric loss feature coordinate axis from the preset multidimensional reference space; wherein, the dielectric loss reference field timetable comes from the cable dielectric loss reference feature sequence in the historical power outage test samples of the same type of cable, the dielectric loss reference specification field timetable comes from the field table formed after performing reference field specification processing on the dielectric loss reference field timetable, the dielectric loss field center value and dielectric loss field discrete scale value come from the field distribution status of the same dielectric loss reference field in multiple historical power outage test samples in the dielectric loss reference field timetable, the dielectric loss field association record comes from the synchronous change relationship between different dielectric loss reference fields in the dielectric loss reference specification field timetable, the dielectric loss candidate direction record comes from the dielectric loss reference field combination in the dielectric loss field association record, and the dielectric loss feature coordinate axis comes from the sorted dielectric loss candidate direction record. The timetable of dielectric loss reference fields, the timetable of dielectric loss reference specification fields, the center value of dielectric loss fields, the discrete scale value of dielectric loss fields, the associated records of dielectric loss fields, the candidate direction records of dielectric loss, and the dielectric loss feature coordinate axes together define the field reading caliber, field specification caliber, and the common change direction reference of dielectric loss response when the cable dielectric loss feature sequence enters the preset multi-dimensional reference space. This allows the cable dielectric loss feature sequence to undergo projection processing under the historical dielectric loss response reference of the same type of cable, instead of directly comparing fixed thresholds based on the original fields of dielectric loss test.

[0051] Preferably, the technical essence of the cable dielectric loss reference characteristic sequence is a sequence of dielectric loss response data formed during historical power outage tests of the same type of cable. This sequence is used to characterize the changes in energy loss, dielectric loss trend, and dielectric loss fluctuations of the insulation material under power outage test excitation. The cable dielectric loss reference characteristic sequence includes a dielectric loss change reference field, a dielectric loss slope reference field, and a dielectric loss stability reference field. The dielectric loss change reference field characterizes the dielectric loss amplitude state formed by the change in insulation dielectric loss amplitude with test conditions in historical power outage test samples. The dielectric loss slope reference field characterizes the dielectric loss trend state formed by the change in dielectric loss response with test time in historical power outage test samples. The dielectric loss stability reference field characterizes the dielectric loss fluctuation state formed by the dielectric loss response under the same power outage test caliber in historical power outage test samples. The cable dielectric loss reference feature sequence is processed by field expansion to form a dielectric loss reference field timetable. The dielectric loss reference field timetable is then processed by reference field specification to form a dielectric loss reference specification field timetable. The dielectric loss reference specification field timetable continues to participate in the formation process of dielectric loss field association records. The dielectric loss field association records continue to participate in the formation process of dielectric loss candidate direction records. The dielectric loss candidate direction records continue to participate in the formation process of dielectric loss feature coordinate axes. Therefore, the cable dielectric loss reference feature sequence is not only used to store historical dielectric loss response data, but also to provide a dielectric loss response reference for cables of the same type for the projection processing of the cable dielectric loss feature sequence.

[0052] Preferably, the dielectric loss reference field schedule is used for the cable dielectric loss characteristic sequence in the following manner: First, the dielectric loss reference record rows and dielectric loss reference field columns in the dielectric loss reference field schedule are read. The dielectric loss reference record rows are jointly defined by the sample cable identifier and the sample test time field. The dielectric loss reference field columns include a dielectric loss change reference field column, a dielectric loss slope reference field column, and a dielectric loss stability reference field column. Subsequently, the dielectric loss change reference field values ​​in the dielectric loss change reference field column, the dielectric loss slope reference field values ​​in the dielectric loss slope reference field column, and the dielectric loss stability reference field values ​​in the dielectric loss stability reference field column are read, and a field distribution record is formed based on the multiple dielectric loss reference field values ​​corresponding to each dielectric loss reference field. The field distribution record is used to carry the field value distribution status of the same dielectric loss reference field in multiple historical power outage test samples. The center position field value of each dielectric loss reference field is read according to the field distribution record to form the corresponding dielectric loss field center value, and the corresponding dielectric loss field discrete scale value is formed according to the deviation of each dielectric loss reference field value from the corresponding dielectric loss field center value. The center value of the dielectric loss field is used for subsequent center offset processing of the cable dielectric loss characteristic sequence, and the discrete scale value of the dielectric loss field is used for subsequent amplitude conversion processing of the field value formed by the center offset processing. This enables the cable dielectric loss characteristic sequence to use the field specification caliber in the preset multidimensional reference space.

[0053] Preferably, the dielectric loss reference specification field timetable is formed and participates in subsequent processing in the following manner: First, using the center value of the dielectric loss field, the corresponding dielectric loss reference field value in the dielectric loss reference field timetable is subjected to center offset processing to form a dielectric loss center offset field value; the dielectric loss center offset field value is used to characterize the deviation direction and deviation magnitude of the dielectric loss reference field value relative to the center value of the dielectric loss field. Subsequently, using the discrete scale value of the dielectric loss field, the corresponding dielectric loss center offset field value is subjected to amplitude conversion processing to form a dielectric loss reference specification field value; the dielectric loss reference specification field value is used to convert the dielectric loss variation reference field, dielectric loss slope reference field, and dielectric loss stability reference field to the same field specification caliber. Finally, according to the dielectric loss reference record row and dielectric loss reference field column in the dielectric loss reference field timetable, the dielectric loss reference specification field values ​​are backfilled into the corresponding positions to form the dielectric loss reference specification field timetable. The dielectric loss reference specification field schedule retains the sample cable identifier, sample test time field, and dielectric loss reference field column from the dielectric loss reference field schedule, and converts the original dielectric loss reference field values ​​into dielectric loss reference specification field values; the dielectric loss reference specification field schedule continues to be used to generate dielectric loss field association records, so that the dielectric loss field association records are formed based on a unified field specification caliber, rather than being directly formed based on dielectric loss reference field values ​​of different dimensions.

[0054] Preferably, the dielectric loss field association record is formed as follows: First, any two dielectric loss reference fields are read from the dielectric loss reference specification field time table, and the dielectric loss reference specification field values ​​corresponding to the two dielectric loss reference fields under the same sample cable identifier and the same sample test time field are read; then, the change direction comparison processing of the dielectric loss reference specification field values ​​corresponding to the two dielectric loss reference fields is performed to form a dielectric loss field direction comparison result. The dielectric loss field direction comparison result includes dielectric loss same-direction change markers, dielectric loss opposite-direction change markers, and dielectric loss amplitude proximity markers; the dielectric loss same-direction change marker is used to record that the two dielectric loss reference fields deviate in the same dielectric loss reference record line from their respective dielectric loss field center values ​​in the same dielectric loss reference record line; the dielectric loss opposite-direction change marker is used to record that the two dielectric loss reference fields deviate in the opposite directions from their respective dielectric loss field center values ​​in the same dielectric loss reference record line; and the dielectric loss amplitude proximity marker is used to record that the deviation amplitude of the two dielectric loss reference fields in the same dielectric loss reference record line meets the pre-configured dielectric loss amplitude proximity judgment condition. The dielectric loss amplitude proximity judgment condition is pre-configured according to the discrete scale value of the dielectric loss field and is used to limit whether the deviation amplitude of the two dielectric loss reference fields is within the same discrete amplitude range. The direction comparison results of the dielectric loss fields formed under multiple dielectric loss reference record rows are then subjected to field association encoding to form dielectric loss field association records. The dielectric loss field association records are used to record the degree of dielectric loss change in the same direction, the degree of dielectric loss change in opposite directions, and the degree of similarity of dielectric loss amplitude in multiple historical power outage test samples of the two dielectric loss reference fields; the dielectric loss field association records are further used to screen the combination of dielectric loss reference fields that can jointly characterize the direction of dielectric loss response change.

[0055] Preferably, the candidate direction record for dielectric loss is formed as follows: First, read the dielectric loss reference field combinations that rank highly in terms of the degree of change in the same direction or the degree of change in opposite directions in the dielectric loss field association record, and form a candidate field group for dielectric loss based on the names of the dielectric loss reference fields in the combination. Then, arrange the dielectric loss reference fields in the candidate field group according to the strength of the field association between each dielectric loss reference field and other dielectric loss reference fields to form a dielectric loss field arrangement order; the dielectric loss field arrangement order is used to limit the order in which the field values ​​of the dielectric loss test specification are read during subsequent projection processing. Next, based on the degree of change in the same direction and the degree of change in opposite directions in the dielectric loss field association record, assign a dielectric loss field direction weight to each dielectric loss reference field in the dielectric loss field arrangement order to form a candidate direction record for dielectric loss; the dielectric loss field direction weight is used to indicate whether the corresponding dielectric loss reference field belongs to the same direction of contribution or the opposite direction of contribution in the same direction of change of dielectric loss response. The dielectric loss candidate direction record includes the dielectric loss candidate field group, the order of dielectric loss fields, and the direction weight of dielectric loss fields. The dielectric loss candidate direction record is used to form the dielectric loss characteristic coordinate axis, so that the dielectric loss characteristic coordinate axis can retain the common change direction reference of the dielectric loss response in the historical dielectric loss response where multiple fields change together.

[0056] Preferably, the dielectric loss characteristic coordinate axis is formed as follows: First, multiple dielectric loss candidate direction records are read, and the number of dielectric loss reference fields covered by each dielectric loss candidate direction record, the degree of dielectric loss change in the same direction corresponding to the dielectric loss candidate direction record, and the degree of dielectric loss change in opposite direction corresponding to the dielectric loss candidate direction record are read. Then, the multiple dielectric loss candidate direction records are sorted according to the number of dielectric loss reference fields covered by the dielectric loss candidate direction records, the degree of dielectric loss change in the same direction corresponding to the dielectric loss candidate direction records, and the degree of dielectric loss change in opposite direction corresponding to the dielectric loss candidate direction records, to form a sorted record of dielectric loss candidate directions. Then, according to the sorted record of dielectric loss candidate directions, the sorted record of dielectric loss candidate directions is configured as the dielectric loss characteristic coordinate axis. The dielectric loss characteristic coordinate axis includes the order of dielectric loss fields, the directional weight of dielectric loss fields, and the sorting position of dielectric loss candidate directions. The order of dielectric loss fields is used to limit the field reading order when the cable dielectric loss characteristic sequence is projected, the directional weight of dielectric loss fields is used to limit the field contribution direction when the cable dielectric loss characteristic sequence is projected, and the sorting position of dielectric loss candidate directions is used to limit the directional position of the common change direction reference of different dielectric loss responses in the preset multi-dimensional reference space. The technical essence of the dielectric loss characteristic coordinate axis is that it is a reference for the common change direction of dielectric loss response formed by historical power outage test samples of the same type of cable. It is then used to carry out the projection processing of the cable dielectric loss characteristic sequence and the mapping processing of the cable dielectric loss scalar.

[0057] Preferably, the field specification process for the step "projecting the cable dielectric loss characteristic sequence to a preset multidimensional reference space for principal component extraction" is as follows: First, based on the power outage test generation time of the cable dielectric loss characteristic sequence generated during the power outage test of the cable to be evaluated, a dielectric loss test segment is extracted from the cable dielectric loss characteristic sequence; the dielectric loss test segment includes a dielectric loss change field, a dielectric loss slope field, and a dielectric loss stability characterization field. Subsequently, according to the field correspondence in the preset multidimensional reference space, the dielectric loss change field is mapped to the dielectric loss change reference field, the dielectric loss slope field is mapped to the dielectric loss slope reference field, and the dielectric loss stability characterization field is mapped to the dielectric loss stability reference field; the field correspondence is pre-configured by the dielectric loss reference field column in the dielectric loss reference field time table and is used to limit which dielectric loss reference field's field specification caliber is adopted for each dielectric loss test field in the cable dielectric loss characteristic sequence. Next, read the center value and discrete scale value of the dielectric loss field corresponding to the reference field of dielectric loss change. Use the center value of the dielectric loss field corresponding to the reference field of dielectric loss change to perform center offset processing on the dielectric loss change field to form the dielectric loss change center offset field value. Then, use the discrete scale value of the dielectric loss field corresponding to the reference field of dielectric loss change to perform amplitude conversion processing on the dielectric loss change center offset field value to form the dielectric loss change specification field value. The dielectric loss change specification field value is then used to form the dielectric loss test specification field sequence.

[0058] Preferably, after forming the dielectric loss variation specification field value, the center value and discrete scale value of the dielectric loss field corresponding to the dielectric loss slope reference field are read. The dielectric loss slope field is then offset using the center value of the dielectric loss field corresponding to the dielectric loss slope reference field to form a dielectric loss slope center offset field value. The amplitude of the dielectric loss slope center offset field value is then calculated using the discrete scale value of the dielectric loss field corresponding to the dielectric loss slope reference field to form the dielectric loss slope specification field value. This dielectric loss slope specification field value is then used to form the dielectric loss test specification field sequence. Subsequently, the center value and discrete scale value of the dielectric loss field corresponding to the dielectric loss stability reference field are read. The center value of the dielectric loss stability characterization field is then offset using the center value of the dielectric loss field corresponding to the dielectric loss stability reference field to form a dielectric loss stability characterization center offset field value. The amplitude of the dielectric loss stability characterization center offset field value is then calculated using the discrete scale value of the dielectric loss field corresponding to the dielectric loss stability reference field to form the dielectric loss stability characterization specification field value. This dielectric loss stability characterization specification field value is then used to form the dielectric loss test specification field sequence. Through the above field standardization process, the dielectric loss variation field, dielectric loss slope field, and dielectric loss stability characterization field are all converted into field values ​​under the same field standard, avoiding the direct mixing of dielectric loss test fields with different dimensional sources.

[0059] Preferably, after the dielectric loss variation specification field value, dielectric loss slope specification field value, and dielectric loss stability characterization specification field value are formed, the order of dielectric loss fields in the dielectric loss characteristic coordinate axis is first read, and then the dielectric loss variation specification field value, dielectric loss slope specification field value, and dielectric loss stability characterization specification field value are rearranged according to the order of dielectric loss fields to form a dielectric loss test specification field sequence. Each dielectric loss test specification field value in the dielectric loss test specification field sequence has a corresponding field source, wherein the dielectric loss variation specification field value comes from the dielectric loss variation field, the dielectric loss slope specification field value comes from the dielectric loss slope field, and the dielectric loss stability characterization specification field value comes from the dielectric loss stability characterization field; the dielectric loss test specification field sequence also carries the power outage test generation time and the cable identification of the cable to be evaluated, so that the dielectric loss test specification field sequence can retain the power outage test generation time source and cable source when forming the cable dielectric loss scalar in the later stage. The dielectric loss test specification field sequence is entered into the dielectric loss characteristic coordinate axis according to the order of dielectric loss fields, so that the cable dielectric loss characteristic sequence is converted into a sequence expression with the same field reading diameter as the dielectric loss characteristic coordinate axis before projection processing.

[0060] Preferably, when the dielectric loss test specification field sequence is projected onto the dielectric loss characteristic coordinate axis, the order of dielectric loss fields in one dielectric loss characteristic coordinate axis is first read, and the dielectric loss test specification field values ​​in the dielectric loss test specification field sequence are read item by item according to the order of dielectric loss fields. Subsequently, the dielectric loss field direction weight corresponding to each dielectric loss reference field in the order of dielectric loss fields is read, and the corresponding dielectric loss test specification field value is subjected to direction-preserving field conversion processing according to the dielectric loss field direction weight to form dielectric loss coordinate conversion field values. The direction-preserving field conversion processing includes dielectric loss direction retention processing and dielectric loss direction reversal processing; the dielectric loss direction retention processing is used to retain the deviation direction of the corresponding dielectric loss test specification field value when the dielectric loss field direction weight represents the same direction of contribution, and the dielectric loss direction reversal processing is used to reverse the deviation direction of the corresponding dielectric loss test specification field value when the dielectric loss field direction weight represents the opposite direction of contribution. When the directional weight of the dielectric loss field indicates a commensurate contribution direction, the corresponding dielectric loss test specification field value is processed to retain the dielectric loss direction, thus forming the corresponding dielectric loss coordinate conversion field value. When the directional weight of the dielectric loss field indicates a reverse contribution direction, the corresponding dielectric loss test specification field value is processed to reverse the dielectric loss direction, thus forming the corresponding dielectric loss coordinate conversion field value. The dielectric loss coordinate conversion field value retains the deviation direction of the dielectric loss test specification field value relative to the center value of the dielectric loss field, while simultaneously transforming the dielectric loss test specification field value to reference the common change direction of the dielectric loss response on the dielectric loss characteristic coordinate axis.

[0061] Preferably, after the dielectric loss coordinate conversion field values ​​are formed, multiple dielectric loss coordinate conversion field values ​​are first read according to the order of the dielectric loss fields, and then written sequentially according to the order of the dielectric loss fields to form a dielectric loss coordinate conversion field value sequence. The dielectric loss coordinate conversion field value sequence includes dielectric loss coordinate conversion field values ​​corresponding to the dielectric loss change specification field values, dielectric loss coordinate conversion field values ​​corresponding to the dielectric loss slope specification field values, and dielectric loss coordinate conversion field values ​​corresponding to the dielectric loss stability characterization specification field values. Subsequently, sequential cumulative encoding processing is performed on the dielectric loss coordinate conversion field value sequence to form the dielectric loss principal component projection value. Sequential cumulative encoding processing refers to accumulating field values ​​that are consistent with the common change direction of the dielectric loss response in the dielectric loss characteristic coordinate axis according to the order of the dielectric loss fields, and subtracting field values ​​that are inconsistent with the common change direction of the dielectric loss response in the dielectric loss characteristic coordinate axis, so as to form the dielectric loss principal component projection value that can characterize the overall projection state of the dielectric loss test segment on a dielectric loss characteristic coordinate axis. The principal component projection values ​​of the dielectric loss are then used to form a sorted record of the principal component projection values ​​of the dielectric loss.

[0062] Preferably, projection processing and sequential cumulative encoding are performed on each dielectric loss characteristic coordinate axis to form dielectric loss principal component projection values ​​corresponding to each dielectric loss characteristic coordinate axis. Each dielectric loss principal component projection value retains the corresponding dielectric loss characteristic coordinate axis, the corresponding dielectric loss candidate direction record, the corresponding dielectric loss field arrangement order, the corresponding dielectric loss field direction weight, the power outage test time, and the cable identification of the cable to be evaluated. Subsequently, multiple dielectric loss principal component projection values ​​are written into a dielectric loss principal component projection value candidate record. The dielectric loss principal component projection value candidate record is used to carry the projection state of the same dielectric loss test segment on different dielectric loss characteristic coordinate axes. Then, based on the deviation magnitude of each dielectric loss principal component projection value, the number of dielectric loss reference fields covered by the dielectric loss candidate direction record corresponding to each dielectric loss principal component projection value, and the degree of dielectric loss change in the same direction corresponding to the dielectric loss candidate direction record corresponding to each dielectric loss principal component projection value, the multiple dielectric loss principal component projection values ​​are sorted to form a dielectric loss principal component projection value sorting record. The principal component projection value sorting record is used to record the dielectric loss characteristic coordinate axis, dielectric loss candidate direction record, and sorting position of the principal component projection value corresponding to each principal component projection value. The principal component projection value sorting record is then used to determine the cable dielectric loss scalar.

[0063] Preferably, after forming the sorting record of the principal component projection values ​​of dielectric loss, the principal component projection values ​​with the highest sorting position are first read from the sorting record, and these read principal component projection values ​​are used as the cable dielectric loss scalar. Subsequently, the dielectric loss characteristic coordinate axis, the candidate direction record, the sorting position of the principal component projection value, the power outage test time, and the cable identification of the cable to be evaluated are read from the sorting record, and the above data are written into the dielectric loss scalar source record. The technical essence of the cable dielectric loss scalar is the low-dimensional compression result of the cable dielectric loss characteristic sequence on the reference of the common change direction of the historical dielectric loss response of the same type of cable. The cable dielectric loss scalar is not a simple summation or average of the dielectric loss change field, dielectric loss slope field, and dielectric loss stability characterization field, but a single state quantity after retaining the reference of the common change direction of the main dielectric loss response in a preset multi-dimensional reference space. The source record of dielectric loss scalar is continued to be used for the mapping processing of cable dielectric loss scalar, so that the source of dielectric loss characteristic coordinate axis, source of dielectric loss candidate direction record, source of sorting position of dielectric loss principal component projection value, source of power outage test generation time and cable source are retained before the cable dielectric loss scalar is entered into the cable dielectric loss dimension reduction vector.

[0064] Preferably, after the cable dielectric loss scalar is formed, the dielectric loss characteristic coordinate axis corresponding to the cable dielectric loss scalar is first read from the dielectric loss scalar source record, and this dielectric loss characteristic coordinate axis is determined as the mapping position of the cable dielectric loss scalar in the characteristic coordinate axis corresponding to the preset multi-dimensional reference space. Subsequently, the dielectric loss candidate direction record corresponding to the cable dielectric loss scalar is read from the dielectric loss scalar source record, and the dielectric loss field arrangement order and dielectric loss field direction weight are read from the dielectric loss candidate direction record to form a dielectric loss mapping caliber record. Then, the sorting position of the dielectric loss principal component projection value, the power outage test generation time, and the cable identification of the cable to be evaluated corresponding to the cable dielectric loss scalar are read from the dielectric loss scalar source record, and the cable dielectric loss scalar, mapping position, dielectric loss mapping caliber record, sorting position of the dielectric loss principal component projection value, power outage test generation time, and cable identification of the cable to be evaluated are written into the dielectric loss coordinate placeholder record. The dielectric loss coordinate placeholder record is used to define the writing position and source path of the cable dielectric loss scalar in subsequent vectorization construction processing. This ensures that when the cable dielectric loss scalar enters the cable dielectric loss dimension reduction vector from a single state quantity, it retains the information about its origin from a dielectric loss characteristic coordinate axis, the order of the dielectric loss fields, the direction weights of the dielectric loss fields, and the corresponding power outage test time. The dielectric loss coordinate placeholder record is further used to establish the dielectric loss dimension reduction vector template and to write the cable dielectric loss scalar into the corresponding placeholder element of the cable dielectric loss dimension reduction vector.

[0065] Preferably, the specific implementation process of the step "mapping the cable dielectric loss scalar to the feature coordinate axes corresponding to the preset multidimensional reference space for vectorization construction processing" is as follows: First, a dielectric loss dimensionality reduction vector template is established based on the dielectric loss coordinate placeholder record; the dielectric loss dimensionality reduction vector template includes placeholder elements for dielectric loss principal component amplitude, dielectric loss principal component direction, dielectric loss deviation polarity, dielectric loss field diameter, dielectric loss weight diameter, and dielectric loss time sequence. The dielectric loss principal component amplitude placeholder element is used to write the cable dielectric loss scalar; the dielectric loss principal component direction placeholder element is used to write the sorting position of the dielectric loss principal component projection value corresponding to the cable dielectric loss scalar; the dielectric loss deviation polarity placeholder element is used to write the deviation direction of the cable dielectric loss scalar relative to the center value of the dielectric loss field; the dielectric loss field diameter placeholder element is used to write the arrangement order of the dielectric loss fields participating in the formation of the cable dielectric loss scalar; the dielectric loss weight diameter placeholder element is used to write the direction weight of the dielectric loss fields participating in the formation of the cable dielectric loss scalar; and the dielectric loss time sequence placeholder element is used to write the time sequence code corresponding to the time of power outage test. Each placeholder element in the dielectric loss dimensionality reduction vector template originates from the dielectric loss coordinate placeholder record, the dielectric loss characteristic coordinate axis, or the time generated by the power outage test. Therefore, the dielectric loss dimensionality reduction vector template is a data carrier format corresponding to the source, direction, deviation state, field caliber, weight caliber, and time position of the cable dielectric loss scalar. The dielectric loss dimensionality reduction vector template is then used to perform vectorization construction processing.

[0066] Preferably, after the dielectric loss dimensionality reduction vector template is formed, vectorization construction processing is performed according to the order of the placeholder elements in the template: first, the cable dielectric loss scalar is written into the dielectric loss principal component amplitude placeholder element to retain the amplitude meaning of the cable dielectric loss scalar; then, the sorting position of the dielectric loss principal component projection value corresponding to the cable dielectric loss scalar is written into the dielectric loss principal component direction placeholder element to retain the directional position of the cable dielectric loss scalar in the feature coordinate axis corresponding to the preset multidimensional reference space; subsequently, the deviation direction of the cable dielectric loss scalar relative to the center value of the dielectric loss field is written into the dielectric loss deviation polarity placeholder element to retain the directional position of the cable dielectric loss scalar in the feature coordinate axis corresponding to the preset multidimensional reference space. The process involves three steps: First, the scalar representation of cable dielectric loss is retained, representing states of increased, slowed, or enhanced fluctuations in the dielectric loss response. Next, the order of the dielectric loss fields involved in forming the scalar is written into a placeholder element for the field diameter, and the directional weights of the dielectric loss fields involved in forming the scalar are written into a placeholder element for the weight diameter, thus preserving the field diameter and weight diameter of the scalar. Finally, the time sequence code corresponding to the power outage test time is written into a placeholder element for the time sequence, preserving the temporal position of the scalar's dielectric loss during continuous power outage tests. These placeholder elements collectively form a cable dielectric loss dimension reduction vector. The technical essence of this vector is to expand the scalar's dielectric loss from a single amplitude state to a low-dimensional representation that simultaneously includes amplitude, direction, deviation polarity, field diameter, weight diameter, and temporal position. This cable dielectric loss dimension reduction vector is then used in conjunction with the cable polarization dimension reduction vector to generate a cable operation fingerprint sequence.

[0067] Preferably, in one scenario, the cable to be evaluated is a power cable that has undergone multiple operating cycles after being laid underground. The cable dielectric loss characteristic sequence includes the dielectric loss change field, dielectric loss slope field, and dielectric loss stability characterization field formed by the power cable during power outage testing. A preset multidimensional reference space is pre-configured based on the cable polarization reference characteristic sequence and cable dielectric loss reference characteristic sequence in historical power outage test samples of the same type of cable. When processing the power cable, firstly, a dielectric loss characteristic coordinate axis is formed using the dielectric loss reference specification field time table in the preset multidimensional reference space; then, the cable dielectric loss characteristic sequence is processed according to the dielectric loss field center value and the dielectric loss field discrete scale value to form a dielectric loss test specification field sequence; next, the dielectric loss test specification field sequence is projected onto the dielectric loss characteristic coordinate axis to form the dielectric loss principal component projection value, and a cable dielectric loss scalar is formed based on the dielectric loss principal component projection value; finally, the cable dielectric loss scalar is mapped to the corresponding occupant position on the dielectric loss characteristic coordinate axis to form a cable dielectric loss dimensionality reduction vector. This processing method differs from the approach of directly using the original fields of dielectric loss test for threshold judgment. It converts the cable dielectric loss feature sequence into a cable dielectric loss dimension reduction vector with historical reference sources of similar cables. This enables the generation of cable operation fingerprint sequence based on the cable polarization dimension reduction vector and the cable dielectric loss dimension reduction vector to read the amplitude change, direction change, field caliber, weight caliber, and time position on the dielectric loss side.

[0068] Optionally, a cable operation fingerprint sequence is generated based on the cable polarization dimension reduction vector and the cable dielectric loss dimension reduction vector, including: performing time-sequential splicing of the cable polarization dimension reduction vector and the cable dielectric loss dimension reduction vector according to the power outage test generation time corresponding to the cable polarization feature sequence and the cable dielectric loss feature sequence to generate the cable operation fingerprint sequence; configuring the power outage test generation time as the cable test recording timestamp, and associating the cable test recording timestamp with the cable operation fingerprint sequence.

[0069] Preferably, the specific implementation process of the step "according to the power outage test generation time corresponding to the cable polarization characteristic sequence and the cable dielectric loss characteristic sequence" is as follows: Before the cable polarization dimension reduction vector and the cable dielectric loss dimension reduction vector enter the time sequence splicing process, the polarization test record identifier, polarization test time field, polarization test channel field, polarization test condition field, and polarization test batch field corresponding to the cable polarization characteristic sequence are read first, and the dielectric loss test record identifier, dielectric loss test time field, dielectric loss test channel field, dielectric loss test condition field, and dielectric loss test batch field corresponding to the cable dielectric loss characteristic sequence are read; then, the polarization test record identifier is pointed back to the cable identifier of the cable to be evaluated to form a polarization source back-pointing result, and the dielectric loss test record identifier is pointed back to the cable identifier of the cable to be evaluated to form a dielectric loss source back-pointing result. Then, the polarization source back-pointing result and the dielectric loss source back-pointing result are written into the cable source verification record; the cable source verification record is used to limit whether the cable polarization characteristic sequence and the cable dielectric loss characteristic sequence originate from the same cable to be evaluated. The cable source verification record continues to participate in the process of determining the power outage test generation time, so that the subsequent power outage test generation time is not only derived from the single-sided test time field, but also from the polarization test time field and dielectric loss test time field of the same cable to be evaluated.

[0070] Preferably, after the cable source verification record is formed, a test batch correspondence record is first established based on the polarization test batch field and the dielectric loss test batch field. This record records whether the cable polarization characteristic sequence and the cable dielectric loss characteristic sequence belong to the same power outage test batch. Subsequently, when the test batch correspondence record indicates that the polarization test batch field and the dielectric loss test batch field belong to the same power outage test batch, the polarization test time field and the dielectric loss test time field are read, and the polarization test time field is converted to a unified polarization time field, and the dielectric loss test time field is converted to a unified dielectric loss time field. The unified polarization time field and the unified dielectric loss time field use the same time granularity, the same date arrangement, and the same time zone caliber. Then, the unified polarization time field and the unified dielectric loss time field are written into a test time format record. This record is used to avoid the polarization test time field and the dielectric loss test time field being misjudged as different power outage test time positions due to differences in the original record format. The test time format record is then used for subsequent time alignment processing.

[0071] Preferably, the preset time alignment tolerance range is pre-configured as follows: First, the power outage test caliber mark of the cable to be evaluated is read, and then the polarization test sampling period, dielectric loss test sampling period, test equipment input delay mark, test batch division mark, and power outage test process sequence mark are read according to the power outage test caliber mark. Subsequently, a basic time alignment range is configured according to the polarization test sampling period and dielectric loss test sampling period, and delay compensation processing is performed on the basic time alignment range according to the test equipment input delay mark to form a delay-compensated time alignment range. Then, batch boundary restriction processing is performed on the delay-compensated time alignment range according to the test batch division mark and the power outage test process sequence mark to form the preset time alignment tolerance range. The preset time alignment tolerance range is used to limit the allowable input time offset between the polarization unified time field and the dielectric loss unified time field within the same power outage test batch; the preset time alignment tolerance range is also used to limit whether the cable polarization dimension reduction vector and the cable dielectric loss dimension reduction vector can enter the same cable operation fingerprint unit. Through the preset time alignment tolerance range, the time alignment processing can distinguish the acquisition offset within the same power outage test batch and the time interval between different power outage test batches.

[0072] Preferably, after the test time format record is formed, the polarization unified time field and dielectric loss unified time field in the test time format record are read first, and the preset time alignment tolerance range is read. Then, the time interval between the polarization unified time field and the dielectric loss unified time field is written into the time interval determination record, and the time interval determination record is subjected to a classification determination process with the preset time alignment tolerance range to form a time alignment determination result. The time alignment determination result is used to characterize whether the polarization unified time field and the dielectric loss unified time field belong to the same power outage test time position. Then, the cable source verification record, test batch correspondence record, test time format record, time interval determination record, and time alignment determination result are written into the power outage test time determination record. The power outage test time determination record is used to carry out the source determination process of the power outage test generation time and continues to participate in the formation process of the power outage test generation time.

[0073] Preferably, when the time alignment determination result indicates that the polarization unified time field and the dielectric loss unified time field belong to the same power outage test time position, the power outage test generation time is determined by recording the power outage test time. Specifically, the polarization unified time field, the dielectric loss unified time field, and the time interval determination record are first read. Then, the acquisition sequence relationship of the polarization unified time field and the dielectric loss unified time field in the same power outage test batch is determined according to the power outage test process sequence marking. Subsequently, this acquisition sequence relationship is written into the power outage test time positioning record. The power outage test time positioning record is used to mark the common time position corresponding to the polarization test and the dielectric loss test in the same power outage test batch. Then, according to the power outage test time positioning record, the polarization unified time field and the dielectric loss unified time field are merged into the power outage test generation time. The technical essence of the power outage test generation time is that the power outage test time position is jointly confirmed by the cable polarization feature sequence and the cable dielectric loss feature sequence. It is used to constrain whether the cable polarization dimension reduction vector and the cable dielectric loss dimension reduction vector belong to the same cable operation fingerprint unit in the subsequent time sequence splicing process.

[0074] Preferably, after the power outage test generation time is determined, the power outage test generation time, polarization test record identifier, dielectric loss test record identifier, polarization test channel field, dielectric loss test channel field, polarization test condition field, dielectric loss test condition field, polarization test batch field, dielectric loss test batch field, and the cable identifier of the cable to be evaluated are first written into the power outage test time source record. The power outage test time source record is used to record the test record source, test channel source, test condition source, and test batch source of the power outage test generation time. Subsequently, based on the power outage test time source record, channel correspondence verification is performed on the polarization test channel field and dielectric loss test channel field to form a test channel correspondence result; and condition correspondence verification is performed on the polarization test condition field and dielectric loss test condition field to form a test condition correspondence result. The test channel correspondence result and test condition correspondence result are then written into the power outage test time source record, so that the power outage test time source record can simultaneously provide the test record source, test channel source, test condition source, and test batch source in subsequent fingerprint time matching processing. The power outage test time source record continues to be used to form fingerprint time pairing records.

[0075] Preferably, the specific implementation process of the step "performing time-series splicing processing of the cable polarization dimension reduction vector and the cable dielectric loss dimension reduction vector" is as follows: First, read the polarization time-series placeholder elements in the cable polarization dimension reduction vector and read the dielectric loss time-series placeholder elements in the cable dielectric loss dimension reduction vector; then, point the polarization time-series placeholder elements back to the power outage test generation time in the power outage test time source record to form a polarization time back-pointing result, and point the dielectric loss time-series placeholder elements back to the power outage test generation time in the same power outage test time source record to form a dielectric loss time back-pointing result. Then, write the polarization time back-pointing result and the dielectric loss time back-pointing result into the fingerprint time pairing record. The fingerprint time pairing record includes the cable polarization dimension reduction vector, the cable dielectric loss dimension reduction vector, the power outage test generation time, the cable identifier of the cable to be evaluated, the test channel corresponding result, and the test condition corresponding result; the fingerprint time pairing record is used to limit whether the cable polarization dimension reduction vector and the cable dielectric loss dimension reduction vector under the same power outage test generation time have the same fingerprint unit encapsulation condition.

[0076] Preferably, the encapsulation conditions of the same fingerprint unit are determined as follows: First, the cable polarization dimension reduction vector, cable dielectric loss dimension reduction vector, power outage test generation time, test channel corresponding result, and test condition corresponding result are read from the fingerprint time pairing record. Then, it is verified whether the cable polarization dimension reduction vector carries a polarization time sequence placeholder element corresponding to the power outage test generation time, and whether the cable dielectric loss dimension reduction vector carries a dielectric loss time sequence placeholder element corresponding to the power outage test generation time, so as to form a vector time consistency result. Then, the test channel corresponding result, test condition corresponding result, and vector time consistency result are written into the fingerprint encapsulation determination record. The fingerprint encapsulation determination record is used to limit whether the cable polarization dimension reduction vector and the cable dielectric loss dimension reduction vector can enter the same cable operation fingerprint unit. When the fingerprint encapsulation determination record indicates that the cable polarization dimension reduction vector and the cable dielectric loss dimension reduction vector belong to the same power outage test generation time, the same cable to be evaluated, and meet the corresponding test condition source, the cable operation fingerprint unit encapsulation process continues.

[0077] Preferably, the cable operation fingerprint unit encapsulation process is implemented as follows: First, a cable operation fingerprint unit template is established based on the fingerprint time pairing record and the fingerprint encapsulation judgment record. The cable operation fingerprint unit template includes a polarization state field area, a dielectric loss state field area, a timestamp field area, a cable source field area, a test source field area, a fingerprint unit verification field area, and a fingerprint unit sequence field area. Subsequently, the cable polarization dimensionality reduction vector is written into the polarization state field area, the cable dielectric loss dimensionality reduction vector is written into the dielectric loss state field area, the power outage test generation time is written into the timestamp field area, the cable identifier of the cable to be evaluated is written into the cable source field area, the polarization test record identifier and the dielectric loss test record identifier are written into the test source field area, and the test channel corresponding result, the test condition corresponding result, and the vector time consistency result are written into the fingerprint unit verification field area to form the cable operation fingerprint unit. The cable operation fingerprint unit uses a parallel encapsulation of field areas to ensure that the polarization state field area retains the low-dimensional state expression of the polarization side, and the dielectric loss state field area retains the low-dimensional state expression of the dielectric loss side. The polarization state field area and the dielectric loss state field area are bound to the same power outage test generation time through the time index field area.

[0078] Preferably, the polarization state field area is used to fully retain the placeholder elements for the polarization principal component amplitude, polarization principal component direction, polarization deviation polarity, polarization field diameter, polarization weight diameter, and polarization time sequence in the cable polarization dimensionality reduction vector; the dielectric loss state field area is used to fully retain the placeholder elements for the dielectric loss principal component amplitude, dielectric loss principal component direction, dielectric loss deviation polarity, dielectric loss field diameter, dielectric loss weight diameter, and dielectric loss time sequence in the cable dielectric loss dimensionality reduction vector. The timestamp field area is used to carry the time of the power outage test and the subsequent cable test entry timestamp; the cable source field area is used to carry the cable identifier of the cable to be evaluated; the test source field area is used to carry the polarization test record identifier and the dielectric loss test record identifier; the fingerprint unit verification field area is used to carry the test channel corresponding result, the test condition corresponding result, and the vector time consistency result; and the fingerprint unit sequence field area is used to carry the subsequent time sorting position. Through the above field configuration, the cable operation fingerprint unit can retain polarization side amplitude, polarization side direction, dielectric loss side amplitude, dielectric loss side direction, power outage test generation time, test record source, test channel source, test condition source, and subsequent time sorting position at the same sequence position, so that the cable operation fingerprint unit can be read in chronological order when generating the cable operation fingerprint sequence later.

[0079] Preferably, after multiple cable operation fingerprint units are formed, the timestamp field of each cable operation fingerprint unit is first read, and the power outage test generation time is read from the timestamp field. Then, the power outage test generation time corresponding to each cable operation fingerprint unit is combined with the cable identifier in the cable source field to form a fingerprint unit time key. The fingerprint unit time key is used to distinguish cable operation fingerprint units formed under different power outage test generation times for the same cable to be evaluated. Then, according to the power outage test generation time in the fingerprint unit time key, multiple cable operation fingerprint units are sorted by time sequence to form a fingerprint unit sorting record. The fingerprint unit sorting record includes the power outage test generation time corresponding to each cable operation fingerprint unit, the fingerprint unit time key, the time sorting position, the cable identifier in the cable source field, and the polarization test record identifier and dielectric loss test record identifier in the test source field. The time sorting position is used to define the sequence position of each cable operation fingerprint unit in the cable operation fingerprint sequence.

[0080] Preferably, after the fingerprint unit sorting record is formed, each cable operation fingerprint unit is sequentially written into the fingerprint unit sequence container according to its time sorting position in the fingerprint unit sorting record to form the initial structure of the cable operation fingerprint sequence. The fingerprint unit sequence container is used to carry multiple cable operation fingerprint units according to their time sorting position, and retains the polarization state field area, dielectric loss state field area, timestamp field area, cable origin field area, test origin field area, fingerprint unit verification field area, and fingerprint unit sequence field area for each cable operation fingerprint unit. Subsequently, the time sorting position is written into the fingerprint unit sequence field area of ​​the corresponding cable operation fingerprint unit, so that each cable operation fingerprint unit carries its sequence position in the initial structure of the cable operation fingerprint sequence. Each sequence position in the initial structure of the cable operation fingerprint sequence corresponds to a cable operation fingerprint unit, and each cable operation fingerprint unit carries the cable polarization dimension reduction vector and cable dielectric loss dimension reduction vector at the same power outage test time.

[0081] Preferably, after forming the initial structure of the cable operation fingerprint sequence, the fingerprint unit sorting record is read, and the temporal continuity of adjacent cable operation fingerprint units is verified according to the fingerprint unit sorting record to form a fingerprint temporal continuity verification record. The fingerprint temporal continuity verification record is used to record the chronological relationship of the power outage test occurrence time, the time interval assignment relationship, and the sequence adjacency relationship between adjacent cable operation fingerprint units. Subsequently, the fingerprint temporal continuity verification record is written into the sequence verification field area of ​​the initial structure of the cable operation fingerprint sequence to form the cable operation fingerprint sequence. The cable operation fingerprint sequence includes multiple cable operation fingerprint units arranged in chronological order of the power outage test occurrence time, and includes a sequence verification field area for recording the temporal continuity between adjacent sequence positions. The technical essence of the cable operation fingerprint sequence is a low-dimensional operation state sequence with time order constraints, polarization state field area, dielectric loss state field area, test source field area, and sequence verification field area; the cable operation fingerprint sequence organizes the low-dimensional state expressions of the polarization side and the low-dimensional state expressions of the dielectric loss side in multiple power outage tests into a continuously readable data sequence in chronological order.

[0082] Preferably, the specific implementation process of the step "configuring the power outage test generation time as a cable test entry timestamp" is as follows: First, read the power outage test generation time from the power outage test time source record and read the time sorting position from the fingerprint unit sorting record; then, convert the power outage test generation time into a timestamp format consistent with the cable operation fingerprint sequence to form a cable test entry timestamp. The cable test entry timestamp includes the timestamp content corresponding to the power outage test generation time and the sequence position content corresponding to the time sorting position; the timestamp content is used to indicate the power outage test time position corresponding to the cable operation fingerprint unit, and the sequence position content is used to indicate the sorting position of the cable operation fingerprint unit in the cable operation fingerprint sequence. The reason for configuring the power outage test generation time as a cable test entry timestamp is that the power outage test generation time comes from the time alignment processing result of the cable polarization feature sequence and the cable dielectric loss feature sequence, which can simultaneously constrain the polarization state field area and the dielectric loss state field area; while the time when the data enters the storage location can only express the order of data writing, and cannot express the power outage test time position corresponding to the cable polarization dimension reduction vector and the cable dielectric loss dimension reduction vector. Therefore, the cable test recording timestamp is used for segmentation processing in subsequent segmented tracking, so that the cable operation fingerprint sequence can be read sequentially along the power outage test time.

[0083] Preferably, after the cable test entry timestamp is generated, it is associated with the cable operation fingerprint sequence in the following way: First, the timestamp field area in each cable operation fingerprint unit is read, and the cable test entry timestamp is written into the timestamp field area that is consistent with the time of the corresponding power outage test, so as to form the cable test entry timestamp field; then, the cable test entry timestamp field is associated with the polarization state field area, dielectric loss state field area, cable source field area, test source field area, and fingerprint unit sequence field area to form the cable test entry timestamp association record. The cable test entry timestamp association record includes the cable test entry timestamp, the sequence position of the cable operation fingerprint unit, the cable polarization dimension reduction vector, the cable dielectric loss dimension reduction vector, the cable identifier of the cable to be evaluated, the polarization test record identifier, and the dielectric loss test record identifier. Then, the cable test entry timestamp association record is written into the sequence index field area of ​​the cable operation fingerprint sequence, so that when the cable test entry timestamp is read later, the corresponding cable operation fingerprint unit and the corresponding polarization state field area and dielectric loss state field area can be located.

[0084] Preferably, after the cable test entry timestamp association record is written into the sequence index field area, the cable operation fingerprint sequence forms a sequence structure that can be read by subsequent segmented tracking processing. Specifically, when performing segmented tracking processing on the cable operation fingerprint sequence, the cable test entry timestamp association record in the sequence index field area is read first. Then, the sequence position of each cable operation fingerprint unit is determined according to the cable test entry timestamp association record. Subsequently, the polarization state field area and dielectric loss state field area are read along the sequence position of each cable operation fingerprint unit to form a segmentable data reading path. The data reading path enables the cable operation fingerprint sequence to enter the subsequent segmentation processing according to the cable test entry timestamp, and ensures that the polarization state field area and dielectric loss state field area maintain the same sequence position correspondence during the segmentation processing. Thus, the cable test entry timestamp is not only a time marker, but also participates in defining the reading order, segmentation boundary, and field correspondence of the cable operation fingerprint sequence in subsequent segmented tracking processing.

[0085] Preferably, in one scenario, the cable to be evaluated is a power cable that has undergone multiple operating cycles after being laid underground. The cable polarization characteristic sequence and the cable dielectric loss characteristic sequence are derived from the polarization test and dielectric loss test in the same power outage test batch, respectively. When generating the cable operation fingerprint sequence for this power cable, the power outage test generation time is first formed based on the polarization test time field, the dielectric loss test time field, and the preset time alignment tolerance range. Then, the cable polarization dimension reduction vector and the cable dielectric loss dimension reduction vector under the same power outage test generation time are written into the same cable operation fingerprint unit. Next, fingerprint unit sorting records are formed according to the power outage test generation times corresponding to multiple cable operation fingerprint units, and the cable operation fingerprint sequence is formed based on the fingerprint unit sorting records. Finally, the power outage test generation time is configured as the cable test entry timestamp, and the cable test entry timestamp is associated with the cable operation fingerprint sequence through the cable test entry timestamp association record. This processing method differs from the approach of storing each test data separately and then making a threshold judgment. Instead, it retains the low-dimensional state expressions of the polarization side and the dielectric loss side at the same power outage test time through the cable operation fingerprint unit. It also organizes multiple cable operation fingerprint units into a continuously traceable cable operation fingerprint sequence by using the cable test recording timestamp, thereby providing a data foundation with a consistent time sequence for the subsequent generation of cable degradation feature indicators.

[0086] Optionally, segmented tracking processing is performed on the cable operation fingerprint sequence to generate cable degradation feature indicators, including: extracting the cable test entry timestamp carried in the cable operation fingerprint sequence, the cable test entry timestamp originating from the time when the cable polarization feature sequence and the cable dielectric loss feature sequence are generated during the power outage test of the cable to be evaluated; segmenting the cable operation fingerprint sequence with cable test entry timestamps according to a preset tracking period to generate multiple cable operation fingerprint slice sequences in different time intervals; performing nonlinear trend tracking processing on each cable operation fingerprint slice sequence to generate multiple local cable degradation feature quantities; and generating cable degradation feature indicators based on the chronological order of the cable test entry timestamps and according to each local cable degradation feature quantity.

[0087] Preferably, the specific implementation process of the step "extracting the cable test entry timestamp carried in the cable operation fingerprint sequence" is as follows: Before performing segmented tracking processing on the cable operation fingerprint sequence, the sequence index field area in the cable operation fingerprint sequence is read first, and the cable test entry timestamp associated records are read item by item from the sequence index field area; the cable test entry timestamp associated records include the cable test entry timestamp, the sequence position of the cable operation fingerprint unit, the cable polarization dimension reduction vector, the cable dielectric loss dimension reduction vector, the cable identifier of the cable to be evaluated, the polarization test record identifier, and the dielectric loss test record identifier. Subsequently, based on the sequence position of the cable operation fingerprint unit in the cable test entry timestamp associated records, the corresponding cable operation fingerprint unit is read back, and the cable test entry timestamp is read from the timestamp field area of ​​the cable operation fingerprint unit to form a cable test entry timestamp reading record. Next, polarization time sequence placeholder elements are read from the polarization status field area of ​​the cable operation fingerprint unit, and dielectric loss time sequence placeholder elements are read from the dielectric loss status field area of ​​the cable operation fingerprint unit. These polarization time sequence placeholder elements, dielectric loss time sequence placeholder elements, and the cable test entry timestamp are written into the same timestamp consistency record. The timestamp consistency record is used to record whether the cable test entry timestamp corresponds to both the polarization status field area and the dielectric loss status field area. The timestamp consistency record continues to be written into the cable test entry timestamp read record, so that the cable test entry timestamp read record not only carries the sequence correspondence between the cable test entry timestamp and the cable operation fingerprint unit, but also the field correspondence between the cable test entry timestamp and the polarization time sequence placeholder elements and the dielectric loss time sequence placeholder elements. Subsequent preset tracking cycle configuration, segmentation processing, and nonlinear trend tracking processing all read the cable test entry timestamp read record to organize the cable operation fingerprint sequence along the power outage test generation time rather than the data writing time.

[0088] Preferably, the source of the cable test entry timestamp is verified before segmented tracking processing in the following manner: First, the polarization test record identifier and dielectric loss test record identifier are read from the cable test entry timestamp associated record. The polarization test record identifier is used to reference the polarization test time field in the cable polarization characteristic sequence, and the dielectric loss test record identifier is used to reference the dielectric loss test time field in the cable dielectric loss characteristic sequence. Then, the power outage test generation time in the timestamp field area of ​​the cable operation fingerprint unit is read, and the polarization test time field, dielectric loss test time field, and power outage test generation time are written into the time source verification record. Next, based on the time source verification record, the polarization test time field and the power outage test generation time are checked for source consistency to form a polarization time source verification result; the dielectric loss test time field and the power outage test generation time are also checked for source consistency to form a dielectric loss time source verification result. Finally, based on the polarization time source verification result and the dielectric loss time source verification result, it is verified whether the cable test entry timestamp is converted from the power outage test generation time to form a cable test timestamp source verification result. The cable test entry timestamp source verification result continues to be written into the cable test entry timestamp reading record, so that subsequent segmentation and partitioning processing can only read the cable test entry timestamp that has passed the source verification, thereby avoiding the inclusion of cable polarization dimension reduction vectors and cable dielectric loss dimension reduction vectors that do not belong to the same power outage test time location into the same cable operation fingerprint slice sequence.

[0089] Preferably, the preset tracking cycle is pre-configured as follows: First, the cable type classification record corresponding to the cable to be evaluated is read, and the cable type mark, insulation material type mark, voltage level mark, laying environment mark, and power outage test caliber mark are read from the cable type classification record; then, the normal aging tracking scale record corresponding to the cable type mark, insulation material type mark, voltage level mark, laying environment mark, and power outage test caliber mark in the preset cable operation reference map is read. The normal aging tracking scale record is used to carry the normal aging time span that can be continuously observed during historical power outage tests of the same type of cable, the normal interval range between adjacent power outage test times, the minimum time span that abnormal changes need to be observed separately, the lower limit of the number of cable operation fingerprint units that a single cable operation fingerprint slice sequence needs to include, and the number of overlapping cable operation fingerprint units allowed to be retained between adjacent cable operation fingerprint slice sequences. Next, a tracking cycle configuration record is configured based on the normal aging tracking scale record. The tracking cycle configuration record includes the preset tracking cycle, slice start alignment method, slice end alignment method, slice advance interval, slice overlap retention method, lower limit of slice unit number, and time gap handling method. The preset tracking cycle is not an arbitrary time period, but a time sequence segmentation caliber jointly defined by the power outage test caliber of the same type of cable, the normal aging time span, the abnormal change observation requirements, and the collection density of cable operation fingerprint units. The tracking cycle configuration record continues to participate in the formation process of the tracking cycle boundary record, enabling the segmentation processing to segment the cable operation fingerprint sequence according to the same configuration caliber.

[0090] Preferably, after the tracking cycle configuration record is formed, the preset tracking cycle is first matched with the cable test entry timestamp reading record to determine the time range within the cable operation fingerprint sequence that can enter the same cable operation fingerprint slice sequence. Then, according to the slice start alignment method, the cable test entry timestamp with the highest sorting position and verified source is selected from the cable test entry timestamp reading record as the first slice start timestamp, and the first slice end timestamp is determined according to the preset tracking cycle to form the first tracking cycle boundary record. Next, according to the slice advancement interval, the first slice start timestamp is advanced to form subsequent slice start timestamps, and subsequent tracking cycle boundary records are formed according to the subsequent slice start timestamps and the preset tracking cycle. The first tracking cycle boundary record and subsequent tracking cycle boundary records together constitute the tracking cycle boundary record; the tracking cycle boundary record includes the slice start timestamp, slice end timestamp, slice advancement interval, slice overlap retention method, lower limit of the number of slice units, and time gap handling method. The tracking cycle boundary records are then used to segment the cable operation fingerprint sequence, ensuring that each cable operation fingerprint slice sequence has a retrievable slice start timestamp, slice end timestamp, and segmentation configuration source.

[0091] Preferably, the specific implementation process of step "segmenting the cable operation fingerprint sequence with cable test entry timestamps" is as follows: First, read the slice start timestamp and slice end timestamp from the tracking cycle boundary record, and read the cable test entry timestamp association record from the sequence index field area of ​​the cable operation fingerprint sequence; then, determine the interval assignment of each cable test entry timestamp association record with the slice start timestamp and slice end timestamp respectively to form a fingerprint unit interval assignment record. The fingerprint unit interval assignment record is used to record whether each cable operation fingerprint unit falls into the corresponding tracking cycle boundary record, and to record the sequence position of the cable operation fingerprint unit falling into the corresponding tracking cycle boundary record in the cable operation fingerprint sequence. Then, based on the fingerprint unit interval assignment record, extract multiple cable operation fingerprint units falling into the same tracking cycle boundary record from the cable operation fingerprint sequence, and arrange them according to the order of the cable test entry timestamps in each cable operation fingerprint unit to form a cable operation fingerprint slice sequence. The technical essence of the cable operation fingerprint slice sequence is that it is a subsequence of cable operation fingerprint units that maintains the time order within the boundary record of the same tracking period. It retains the polarization state field area, dielectric loss state field area, time index field area, cable origin field area, test origin field area, and fingerprint unit verification field area in each cable operation fingerprint unit. Therefore, the cable operation fingerprint slice sequence is not a simple time period mark, but a subsequence of cable operation fingerprint units that can be directly read by subsequent nonlinear trend tracking processing.

[0092] Preferably, when forming a cable operation fingerprint slice sequence, a slice integrity verification process is also performed on the cable operation fingerprint slice sequence: First, the first and last cable operation fingerprint units in the cable operation fingerprint slice sequence are read, and a slice coverage time record is formed based on the cable test entry timestamps in the first and last cable operation fingerprint units; then, the cable test entry timestamps of two adjacent cable operation fingerprint units in the cable operation fingerprint slice sequence are read, and an internal time interval record is formed based on the time interval between the two adjacent cable operation fingerprint units. The slice coverage time record, the internal time interval record, the tracking cycle boundary record, the fingerprint unit interval assignment record, and the lower limit of the number of slice units are then written into the slice verification record. The slice verification record is used to mark whether the cable operation fingerprint slice sequence covers the corresponding tracking cycle boundary record, whether the lower limit of the number of slice units has been reached, and whether there is a time interval exceeding the time gap processing method. The slice verification record continues to participate in the nonlinear trend tracking process, enabling the nonlinear trend tracking process to use different reading apertures for cable operation fingerprint slice sequences that do not exceed the time gap processing method and cable operation fingerprint slice sequences that exceed the time gap processing method. As a result, the cable operation fingerprint slice sequence is not only a simple extracted sequence fragment, but also carries slice coverage time records, slice internal time interval records, and lower limit of the number of slice units that can be used for trend interpretation.

[0093] Preferably, the specific implementation process of step "perform nonlinear trend tracking processing on each cable operation fingerprint slice sequence" is as follows: For each cable operation fingerprint slice sequence, firstly, read the cable operation fingerprint units one by one according to the order of the cable test recording timestamps, and read the polarization principal component amplitude placeholder element, polarization principal component direction placeholder element, polarization deviation polarity placeholder element, polarization field diameter placeholder element, and polarization weight diameter placeholder element from the polarization state field area of ​​each cable operation fingerprint unit. Then, read the dielectric loss principal component amplitude placeholder element and dielectric loss principal component direction placeholder element from the dielectric loss state field area of ​​each cable operation fingerprint unit. The polarization slice state trajectory record is created by first identifying placeholder elements for polarization principal component amplitude, polarization principal component direction, polarization deviation from polarity, polarization field diameter, and polarization weight, along with the corresponding cable test entry timestamp. The polarization slice state trajectory record is used to express the change process of the low-dimensional state expression on the polarization side over time within the same cable operation fingerprint slice sequence. Both records are then processed in nonlinear trend tracking to avoid mixing polarization-side changes and dielectric loss-side changes into a single, uninterpretable value.

[0094] Preferably, the nonlinear trend tracking processing includes adjacent state differential tracking processing, time interval conversion processing, trend bending tracking processing, and continuous deviation tracking processing. Adjacent state differential tracking processing first reads the polarization principal component amplitude placeholder elements corresponding to the test entry timestamps of two adjacent cables in the polarization slice state trajectory record, and forms a polarization adjacent state differential record based on the direction and magnitude of change between the two adjacent polarization principal component amplitude placeholder elements; simultaneously, it reads the dielectric loss principal component amplitude placeholder elements corresponding to the test entry timestamps of two adjacent cables in the dielectric loss slice state trajectory record, and forms a dielectric loss adjacent state differential record based on the direction and magnitude of change between the two adjacent dielectric loss principal component amplitude placeholder elements. Subsequently, time interval conversion processing reads the time interval records within the slice, and, based on the time interval between two adjacent cable operation fingerprint units, marks the time interval caliber of the polarization adjacent state differential record and the dielectric loss adjacent state differential record to form a polarization time interval conversion record and a dielectric loss time interval conversion record. The polarization time interval conversion record and the dielectric loss time interval conversion record are used to distinguish the state changes under different time intervals, so that the subsequent trend bending tracking process reads the polarization time interval conversion record and the dielectric loss time interval conversion record, instead of directly reading the polarization adjacent state difference record and the dielectric loss adjacent state difference record that do not distinguish the time interval.

[0095] Preferably, the trend bending tracking process is performed based on polarization time interval conversion records and dielectric loss time interval conversion records: First, two adjacent polarization time interval conversion records are read, and the direction of change between the two adjacent polarization time interval conversion records is compared to see if the change amplitude has changed, or if the change amplitude has increased rapidly or decreased in convergence, to form a polarization trend bending record; then, two adjacent dielectric loss time interval conversion records are read, and the direction of change between the two adjacent dielectric loss time interval conversion records is compared to see if the change amplitude has changed, or if the change amplitude has increased rapidly or decreased in convergence, to form a dielectric loss trend bending record. The polarization trend bending record is used to characterize whether the insulation polarization response, within the tracking period, exhibits a nonlinear change state from a stable change to accelerated deviation, from accelerated deviation to slow recovery, or from recovery to renewed deviation; the dielectric loss trend bending record is used to characterize whether the dielectric loss response, within the tracking period, exhibits a nonlinear change state from a slow change to rapid increase, from rapid increase to slowing down, or from slowing down to increased fluctuation. Polarization trend bending records and dielectric loss trend bending records continue to participate in the continuous deviation tracking process, enabling the nonlinear trend tracking process to simultaneously consider adjacent changes, time intervals, and trend bending, rather than making judgments based solely on a single change between two adjacent cable running fingerprint units.

[0096] Preferably, the continuous deviation tracking process is performed as follows: First, the polarization deviation polarity placeholder element in the polarization slice status trajectory record is read, and the same-direction maintenance state of the polarization deviation polarity placeholder element under the timestamps of multiple consecutive cable tests is used to form a continuous polarization deviation record; then, the dielectric loss deviation polarity placeholder element in the dielectric loss slice status trajectory record is read, and the same-direction maintenance state of the dielectric loss deviation polarity placeholder element under the timestamps of multiple consecutive cable tests is used to form a continuous dielectric loss deviation record. Subsequently, the polarization field diameter placeholder element and the polarization weight diameter placeholder element are read, and a correspondence is established between the continuous polarization deviation record and the polarization field diameter placeholder element and the polarization weight diameter placeholder element to form a continuous polarization deviation source record; and the dielectric loss field diameter placeholder element and the dielectric loss weight diameter placeholder element are read, and a correspondence is established between the continuous dielectric loss deviation record and the dielectric loss field diameter placeholder element and the dielectric loss weight diameter placeholder element to form a continuous dielectric loss deviation source record. The polarization persistent deviation source record is used to express the source of the polarization field and polarization weight corresponding to the polarization persistent deviation record. The dielectric loss persistent deviation source record is used to express the source of the dielectric loss field and dielectric loss weight corresponding to the dielectric loss persistent deviation record. Subsequently, the polarization adjacent state difference record, dielectric loss adjacent state difference record, polarization time interval conversion record, dielectric loss time interval conversion record, polarization trend bending record, dielectric loss trend bending record, polarization persistent deviation source record, and dielectric loss persistent deviation source record are written into the slice nonlinear trend record. The slice nonlinear trend record is used to carry the basis for the nonlinear changes of the polarization side and dielectric loss side within each cable operation fingerprint slice sequence. Subsequently, cable local degradation characteristic quantities are generated based on the slice nonlinear trend record.

[0097] Preferably, the specific implementation process of the step "generating multiple cable local degradation characteristic quantities" is as follows: For each cable operation fingerprint slice sequence, firstly, read the slice nonlinear trend record corresponding to the cable operation fingerprint slice sequence, and read the polarization time interval conversion record, dielectric loss time interval conversion record, polarization trend bending record, dielectric loss trend bending record, polarization continuous deviation source record, and dielectric loss continuous deviation source record from the slice nonlinear trend record; then, perform polarization side trend encapsulation processing on the polarization time interval conversion record and polarization trend bending record to form a polarization side local degradation sub-quantity, perform dielectric loss side trend encapsulation processing on the dielectric loss time interval conversion record and dielectric loss trend bending record to form a dielectric loss side local degradation sub-quantity, and form a continuous deviation sub-quantity based on the polarization continuous deviation source record and dielectric loss continuous deviation source record. Then, write the polarization side local degradation sub-quantity, dielectric loss side local degradation sub-quantity, continuous deviation sub-quantity, slice start timestamp, slice end timestamp, slice verification record, and cable identifier of the cable to be evaluated into the cable local degradation characteristic quantity. The technical essence of cable local degradation characteristic quantity is a local degradation state expression presented by the cable operation fingerprint sequence within a tracking period. It is not a single-point threshold exceeding result, but a local temporal degradation characterization formed by polarization side change, dielectric loss side change, continuous deviation state, slice coverage time record, slice internal time interval record, and lower limit of slice unit number.

[0098] Preferably, there are multiple cable local degradation features because the cable operation fingerprint sequence is divided into multiple cable operation fingerprint slice sequences in different time intervals according to a preset tracking period. Each cable operation fingerprint slice sequence corresponds to a tracking period boundary record, and each cable operation fingerprint slice sequence undergoes independent nonlinear trend tracking processing. Specifically, a slice identifier is first configured for each cable operation fingerprint slice sequence, and the slice identifier, slice start timestamp, slice end timestamp, slice verification record, and slice nonlinear trend record are written into the slice degradation source record. Subsequently, cable local degradation features corresponding to each cable operation fingerprint slice sequence are generated according to the slice degradation source record. Multiple cable local degradation features are arranged according to their respective slice start timestamps and slice end timestamps, which can express the local degradation changes of the cable to be evaluated within multiple tracking periods, rather than just giving the state result at a single test moment. The slice degradation source record is further used to generate cable degradation feature indicators, so that each cable local degradation feature can point back to the corresponding cable operation fingerprint slice sequence, tracking period boundary record, and slice nonlinear trend record.

[0099] Preferably, the specific implementation process of the step "generating cable degradation feature indicators based on the order of cable test recording timestamps and according to each cable local degradation feature quantity" is as follows: First, read the slice start timetamp, slice end timetamp, and corresponding cable test recording timestamp range from each cable local degradation feature quantity, and establish a local degradation time sorting record according to the order of slice start timetamp and slice end timetamp; the local degradation time sorting record is used to limit the temporal position of each cable local degradation feature quantity in the cable operation fingerprint sequence. Subsequently, according to the local degradation time sorting record, read the polarization side local degradation sub-quantity, dielectric loss side local degradation sub-quantity, and continuous deviation sub-quantity from two adjacent cable local degradation feature quantities, and perform temporal continuity determination on the degradation direction continuation state, degradation amplitude expansion state, degradation trend reversal state, and slice time interval connection state between two adjacent cable local degradation feature quantities to form a local degradation continuity record. Local degradation continuity records are continued to be used to generate cable degradation feature indicators, enabling the cable degradation feature indicators to reflect the degradation evolution relationship between multiple tracking cycles and to distinguish the basis for the formation of continuous degradation segment records, interval degradation segment records, and degradation transition segment records.

[0100] Preferably, the cable degradation feature indicator is formed as follows: First, the local degradation time sorting record and local degradation continuation record are read, and the temporal arrangement position of each cable local degradation feature quantity is determined according to the local degradation time sorting record; then, according to the local degradation continuation record, the cable local degradation feature quantities that are temporally adjacent and have continuous degradation direction are processed by field aggregation and encapsulation to form a continuous degradation segment record; the cable local degradation feature quantities that are temporally adjacent but have changed degradation direction are processed by trend reversal encapsulation to form a degradation reversal segment record; and the cable local degradation feature quantities that have time gaps but whose degradation direction remains consistent before and after the gap are processed by interval degradation encapsulation to form an interval degradation segment record. Finally, the continuous degradation segment record, degradation reversal segment record, interval degradation segment record, the slice start timestamp and slice end timestamp corresponding to each cable local degradation feature quantity, and the cable identifier of the cable to be evaluated are written into the cable degradation feature indicator. The technical essence of cable degradation characteristic indicators is to form overall degradation indication data by organizing multiple local degradation states in a time sequence based on the time sequence of the cable operation fingerprint sequence. It is used to express the degradation direction, degradation duration, degradation inflection point and interval degradation point of the cable under evaluation in continuous power outage test.

[0101] Preferably, after the cable degradation feature indicator is formed, a source correspondence is established between the cable degradation feature indicator and the cable test entry timestamp reading record, tracking cycle configuration record, tracking cycle boundary record, slice verification record, slice nonlinear trend record, slice deterioration source record, local deterioration time sorting record, and local deterioration continuation record to form a degradation indicator source record. The degradation indicator source record is used to record which cable operation fingerprint slice sequence, which preset tracking cycle, which set of cable local deterioration feature quantities, and which local deterioration continuation record each continuous degradation segment record, each degradation transition segment record, and each interval degradation segment record in the cable degradation feature indicator originates from. Subsequently, when the cable degradation feature indicator is imported into a preset cable operation benchmark map for matching verification, the corresponding polarization state field area, dielectric loss state field area, cable test entry timestamp, slice verification record, and slice nonlinear trend record can be read back through the degradation indicator source record. This ensures that the matching verification does not read a degradation result in isolation, but rather reads the temporal source, field source, and slice source in its formation process.

[0102] Preferably, in one scenario, the cable to be evaluated is a power cable that has undergone multiple operating cycles after being laid underground. The cable operation fingerprint sequence includes multiple cable operation fingerprint units arranged according to the cable test entry timestamps. When performing segmented tracking processing on this power cable, a preset tracking period is first configured based on the power outage test caliber marking of the cable to be evaluated and the normal aging tracking scale record in the preset cable operation benchmark map. Subsequently, the cable operation fingerprint sequence is segmented according to the preset tracking period, slice advancement interval, and slice overlap retention method to form multiple cable operation fingerprint slice sequences. Then, adjacent state differential tracking processing, time interval conversion processing, trend bending tracking processing, and continuous deviation tracking processing are performed on each cable operation fingerprint slice sequence to form corresponding local cable degradation characteristic quantities. Finally, the local cable degradation characteristic quantities are organized according to the order of the cable test entry timestamps to form cable degradation characteristic indicators. This processing method differs from the approach of directly comparing a single test result with a fixed threshold. It preserves local changes within the tracking period through the cable running fingerprint slice sequence, expresses the local degradation state within different tracking periods through cable local degradation feature quantities, and expresses the degradation evolution relationship between consecutive tracking periods through cable degradation feature indicators. This provides a data foundation with time sequence basis for subsequent matching verification and reverse backtracking mapping processing.

[0103] Optionally, the cable degradation characteristic indicator is imported into a preset cable operation benchmark map corresponding to the cable to be evaluated for matching verification. Then, when the matching verification fails, the cable construction reverse simulation engine is triggered, including: determining the cable degradation fluctuation slope characteristic quantity based on the cable degradation characteristic indicator; retrieving the cable normal aging slope tolerance limit recorded in the preset cable operation benchmark map; determining whether the cable degradation fluctuation slope characteristic quantity and the cable normal aging slope tolerance limit have a coverage intersection; and when it is determined that the cable degradation fluctuation slope characteristic quantity and the cable normal aging slope tolerance limit do not have a coverage intersection, confirming that the matching verification for the preset cable operation benchmark map has failed; in response to the confirmation result of the matching verification failure, sending a start wake-up signal to the cable construction reverse simulation engine so that the cable construction reverse simulation engine enters a reverse backtracking mapping state that can receive cable degradation characteristic indicators.

[0104] Preferably, the specific implementation process of the step "determining the cable degradation fluctuation slope characteristic quantity based on the cable degradation characteristic indicator" is as follows: First, read the cable degradation characteristic indicator, and extract the continuous degradation segment record, degradation transition segment record, interval degradation segment record, slice start timestamp corresponding to each local degradation characteristic quantity of the cable, slice end timestamp corresponding to each local degradation characteristic quantity of the cable, and cable identifier of the cable to be evaluated from the cable degradation characteristic indicator; then, read the degradation indicator source record according to the cable identifier of the cable to be evaluated, and read back the cable operation fingerprint slice sequence, slice nonlinear trend record, and local degradation continuation record corresponding to the continuous degradation segment record from the degradation indicator source record, read back the cable operation fingerprint slice sequence, slice nonlinear trend record, and local degradation continuation record corresponding to the degradation transition segment record from the degradation indicator source record, and read back the cable operation fingerprint slice sequence, slice nonlinear trend record, and local degradation continuation record corresponding to the interval degradation segment record from the degradation indicator source record. Continuous degradation segment records are used to define degradation intervals where multiple localized cable degradation characteristics continuously increase over time. Degradation transition segment records are used to define degradation intervals where the degradation direction or degradation magnitude changes. Intermittent degradation segment records are used to define degradation intervals where there are time gaps but the degradation direction remains consistent before and after the gaps. Degradation indicator source records are used to backreference the continuous degradation segment records, degradation transition segment records, and intermittent degradation segment records to the corresponding polarization state field area, dielectric loss state field area, and cable test entry timestamp, respectively, so that the subsequently formed cable degradation fluctuation slope characteristic can retain the degradation segment source, field source, and time source.

[0105] Preferably, before forming the cable degradation fluctuation slope characteristic quantity, a slope pre-processing is performed on multiple cable local degradation characteristic quantities in the cable degradation characteristic indicator: each cable local degradation characteristic quantity is read in the order of slice start timestamp and slice end timestamp, and the polarization-side local degradation sub-quantity, dielectric loss-side local degradation sub-quantity, continuous deviation sub-quantity, and slice verification record are read from each cable local degradation characteristic quantity; subsequently, based on the slice coverage time record and slice internal time interval record in the slice verification record, the polarization-side local degradation sub-quantity, dielectric loss-side local degradation sub-quantity, and continuous deviation sub-quantity are aligned in terms of time coverage caliber to form a local degradation period status record. The local degradation period status record includes the polarization-side local degradation sub-quantity field, dielectric loss-side local degradation sub-quantity field, continuous deviation sub-quantity field, slice start timestamp field, slice end timestamp field, slice coverage status field, and slice internal time interval field; the local degradation period status record is used to record the correspondence between polarization-side degradation changes, dielectric loss-side degradation changes, and continuous deviation status within the same time range within a tracking period. The status records of localized deterioration periods continue to be processed for differences between adjacent periods, so that the subsequent cable degradation fluctuation slope characteristic is formed based on the status changes between adjacent tracking periods, rather than directly comparing field values ​​in different tracking periods without a source path.

[0106] Preferably, the adjacent time period difference processing specifically involves: first, reading two adjacent local degradation time period status records according to the slice start timestamp and slice end timestamp in the local degradation time period status record; then, performing the same-caliber difference extraction on the polarization-side local degradation sub-quantity field in the previous local degradation time period status record and the polarization-side local degradation sub-quantity field in the subsequent local degradation time period status record to form a polarization-side time period difference record; performing the same-caliber difference extraction on the dielectric loss-side local degradation sub-quantity field in the previous local degradation time period status record and the dielectric loss-side local degradation sub-quantity field in the subsequent local degradation time period status record to form a dielectric loss-side time period difference record; and performing deviation continuation determination on the continuous deviation sub-quantity field in the previous local degradation time period status record and the continuous deviation sub-quantity field in the subsequent local degradation time period status record to form a continuous deviation continuation record. The polarization-side time-period difference record includes the polarization-side change direction field, the polarization-side change amplitude field, and the polarization-side time-period source field. The dielectric loss-side time-period difference record includes the dielectric loss-side change direction field, the dielectric loss-side change amplitude field, and the dielectric loss-side time-period source field. The continuous deviation continuation record includes the continuous deviation direction field, the continuous deviation continuation status field, and the continuous deviation time-period source field. The polarization-side time-period difference record, the dielectric loss-side time-period difference record, and the continuous deviation continuation record are all entered into the slope caliber conversion process so that the change direction, change amplitude, and continuous deviation status between adjacent tracking periods can be converted into a characterization of the rate of degradation change under the same time caliber.

[0107] Preferably, the slope caliber conversion process is implemented as follows: First, read the end timestamp of the previous slice and the start timestamp of the next slice from the status records of two adjacent local degradation periods, and form a time interval record based on the time interval between the end timestamp of the previous slice and the start timestamp of the next slice; then, read the preset tracking period and time gap processing method from the tracking period configuration record, and form a slope conversion time caliber record based on the preset tracking period, time gap processing method and time interval record. The slope-converted time caliber record is used to record whether the state records of two adjacent local degradation periods belong to a continuous tracking interval, a convertible interval, or a time gap interval. When the slope-converted time caliber record indicates that the state records of two adjacent local degradation periods belong to a continuous tracking interval or a convertible interval, the polarization-side time difference record and the slope-converted time caliber record are subjected to time caliber conversion processing to form a polarization-side degradation slope component. The dielectric loss-side time difference record and the slope-converted time caliber record are subjected to time caliber conversion processing to form a dielectric loss-side degradation slope component. Furthermore, the continuous deviation continuation record and the slope-converted time caliber record are subjected to continuous marking processing to form a continuous deviation slope component. The time caliber conversion processing is used to convert the degradation changes between adjacent tracking cycles into a representation of the rate of change under the same tracking time caliber, avoiding direct confusion between degradation changes formed in a short period of time and degradation changes accumulated over a long period of time.

[0108] Preferably, after the polarization-side degradation slope component, dielectric loss-side degradation slope component, and continuous deviation slope component are formed, the polarization-side degradation slope component is first referenced back to the corresponding polarization-side time period difference record, the dielectric loss-side degradation slope component is referenced back to the corresponding dielectric loss-side time period difference record, and the continuous deviation slope component is referenced back to the corresponding continuous deviation continuation record to form a slope component source record. Subsequently, a correspondence is established between the slope component source record and the local degradation time period status record, time period interval record, and slope conversion time caliber record to form a slope component verification record. The slope component verification record is used to record the time conversion caliber, field source, and adjacent tracking cycle source used for the polarization-side degradation slope component, dielectric loss-side degradation slope component, and continuous deviation slope component, respectively. The slope component verification record continues to enter the fluctuation slope encapsulation processing, so that the cable degradation fluctuation slope characteristic can simultaneously retain the slope component numerical meaning, slope component source path, and slope component time caliber.

[0109] Preferably, the fluctuation slope encapsulation process specifically involves: first reading the continuous degradation segment record, degradation transition segment record, and interval degradation segment record; and writing the continuously enhanced polarization-side degradation slope component, dielectric loss-side degradation slope component, and persistent deviation slope component into the continuous degradation slope field area based on the continuous degradation segment record; writing the polarization-side degradation slope component, dielectric loss-side degradation slope component, and persistent deviation slope component that undergo degradation direction or degradation amplitude change into the degradation transition slope field area based on the degradation transition segment record; and writing the polarization-side degradation slope component, dielectric loss-side degradation slope component, and persistent deviation slope component that have a time gap but maintain the degradation direction before and after the gap into the interval degradation slope field area based on the interval degradation segment record. Subsequently, the continuous degradation slope field area, degradation transition slope field area, interval degradation slope field area, slope component source record, slope component verification record, slice start timestamp and slice end timestamp corresponding to the status record of each local degradation period, and the cable identifier of the cable to be evaluated are written into the cable degradation fluctuation slope characteristic quantity. The technical essence of the cable degradation fluctuation slope characteristic quantity is to characterize the rate of degradation change of the cable degradation characteristic indicator in time sequence. It is used to express the degradation change direction, degradation change amplitude, degradation change time distribution status, and degradation change field source of the cable to be evaluated in continuous power outage test. The cable degradation fluctuation slope characteristic quantity is not the result of threshold judgment of a single cable local degradation characteristic quantity, but is formed by the successive changes of multiple cable local degradation characteristic quantities in time sequence.

[0110] Preferably, the preset cable operation reference map is pre-configured in the following manner: First, historical power outage test samples of the same type of cable are read, and sample caliber verification processing is performed on the historical power outage test samples to filter out historical power outage test samples whose cable type mark, insulation material type mark, voltage level mark, laying environment mark, and power outage test caliber mark all correspond to the same map configuration caliber; then, historical normal aging state marks are read from the historical power outage test samples that have passed the sample caliber verification processing, and historical power outage test samples carrying historical normal aging state marks are configured as historical normal aging power outage test samples; then, historical cable operation fingerprint sequence, historical cable test entry timestamp, historical cable local degradation characteristic quantity, and historical cable degradation characteristic indicator are extracted from the historical normal aging power outage test samples, and the historical cable operation fingerprint sequence, historical cable test entry timestamp, historical cable local degradation characteristic quantity, and historical cable degradation characteristic indicator are written into the reference map sample source record. The reference spectrum sample source record is used to record the source of the operating fingerprint, time source, local degradation source, and overall degradation source of the same type of cable in the historical normal aging power outage test samples; the reference spectrum sample source record is further used to form the reference spectrum caliber record and the cable normal aging slope tolerance limit, so that the preset cable operating reference spectrum is not a static experience table, but a data spectrum formed by the historical normal aging power outage test samples of the same type of cable according to a unified caliber configuration.

[0111] Preferably, the baseline spectrum caliber record is formed as follows: Cable type markers, insulation material type markers, voltage level markers, laying environment markers, and power outage test caliber markers are read from the historical normal aging power outage test samples corresponding to the baseline spectrum sample source record, and these markers are written into the baseline spectrum caliber record. Subsequently, a caliber source correspondence relationship is established between the baseline spectrum caliber record and the baseline spectrum sample source record. The baseline spectrum caliber record is used to limit which historical normal aging power outage test samples can enter the same preset cable operation baseline spectrum; the caliber source correspondence relationship is used to read back the baseline spectrum sample source record when subsequently retrieving the cable normal aging slope tolerance limit, so that the cable normal aging slope tolerance limit can correspond to a specific historical cable operation fingerprint sequence, historical cable test entry timestamp, historical cable local degradation characteristic quantity, and historical cable degradation characteristic indicator.

[0112] Preferably, the pre-configuration process for the tolerance limit of normal aging slope of the cable is as follows: First, read the historical cable degradation characteristic indicators in the source record of the reference spectrum sample, and perform the same slope pre-processing, adjacent time period difference processing, and slope caliber conversion processing as the cable degradation fluctuation slope characteristic quantity. Then, extract the time sequence difference and convert the time caliber of the historical cable local deterioration characteristic quantity in the historical cable degradation characteristic indicator to form a historical normal aging slope record. Subsequently, according to the reference spectrum caliber record, write the historical normal aging slope records belonging to the same cable type mark, the same insulation material type mark, the same voltage level mark, the same laying environment mark, and the same power outage test caliber mark into the same reference spectrum slope group record. The historical normal aging slope record includes the historical continuous degradation slope field area, the historical degradation transition slope field area, the historical interval degradation slope field area, and the historical slope source field area; the benchmark map slope grouping record is used to collect and encapsulate multiple historical normal aging slope records under the same map configuration caliber, thereby providing historical normal aging slope records of the same caliber for boundary extraction processing.

[0113] Preferably, the boundary extraction process is performed as follows: First, multiple historical normal aging slope records corresponding to the historical continuous degradation slope field area are read from the baseline map slope grouping records, and field boundary extraction processing is performed on the historical continuous degradation slope field area in the multiple historical normal aging slope records according to the preset boundary extraction caliber, so as to form a continuous degradation slope tolerance field area; then, multiple historical normal aging slope records corresponding to the historical degradation transition slope field area are read from the baseline map slope grouping records, and field boundary extraction processing is performed on the historical degradation transition slope field area in the multiple historical normal aging slope records according to the preset boundary extraction caliber, so as to form a degradation transition slope tolerance field area; then, multiple historical normal aging slope records corresponding to the historical interval degradation slope field area are read from the baseline map slope grouping records, and field boundary extraction processing is performed on the historical interval degradation slope field area in the multiple historical normal aging slope records according to the preset boundary extraction caliber, so as to form an interval degradation slope tolerance field area. The preset boundary extraction caliber record is used to limit the field boundary extraction rules for reading low-level and high-level boundary fields from multiple historical normal aging slope records. The field boundary extraction processing is used to read the low-level and high-level boundary fields of historical normal aging slope records under the same map configuration caliber, and uses the low-level and high-level boundary fields as the boundary source of the allowable range of normal aging. The continuous degradation slope tolerance field area, the degradation transition slope tolerance field area, and the interval degradation slope tolerance field area together form the cable normal aging slope tolerance limit.

[0114] Preferably, after the tolerance limit for the normal aging slope of the cable is formed, the following fields are written into the tolerance limit for the normal aging slope: continuous degradation slope tolerance field area, degradation transition slope tolerance field area, interval degradation slope tolerance field area, applicable cable type field, applicable insulation material field, applicable voltage level field, applicable laying environment field, applicable power outage test caliber field, applicable time interval field, and boundary source field. The applicable cable type field, applicable insulation material field, applicable voltage level field, applicable laying environment field, and applicable power outage test caliber field are derived from the baseline spectrum caliber record; the applicable time interval field is derived from the historical tracking period range corresponding to the historical cable test entry timestamp; and the boundary source field is derived from the baseline spectrum slope grouping record and the preset boundary extraction caliber record. Therefore, the technical essence of the tolerance limit for the normal aging slope of the cable is the range of degradation change rate allowed for the same type of cable under normal aging conditions, and this range of degradation change rate corresponds to the cable type, insulation material, voltage level, laying environment, power outage test caliber, and historical tracking period range.

[0115] Preferably, the preset cable operation benchmark map also includes a benchmark map index record. The benchmark map index record is established as follows: First, the cable type mark, insulation material type mark, voltage level mark, laying environment mark, and power outage test caliber mark from the benchmark map caliber record are written into the map caliber index field area. Then, the cable normal aging slope tolerance limit, benchmark map sample source record, benchmark map slope grouping record, caliber source correspondence, preset boundary extraction caliber record, and cable basic characteristic map archive are written into the map data pointing field area to form the benchmark map index record. The cable basic characteristic map archive is used to record the basic specification caliber, insulation material caliber, operating environment caliber, and power outage test caliber of cables of the same type. The benchmark map index record is used to enable the cable under evaluation to retrieve the corresponding preset cable operation benchmark map according to its own cable type classification record during matching tests, instead of indiscriminately reading the cable normal aging slope tolerance limit from a general data table. The benchmark map index record continues to participate in the retrieval processing of the cable normal aging slope tolerance limit.

[0116] Preferably, the specific implementation process of the step "retrieving the cable normal aging slope tolerance limit recorded in the preset cable operation benchmark map" is as follows: First, read the cable type classification record corresponding to the cable to be evaluated, and read the cable type mark, insulation material type mark, voltage level mark, laying environment mark, and power outage test caliber mark from the cable type classification record; then, perform index matching processing between the cable type mark, insulation material type mark, voltage level mark, laying environment mark, and power outage test caliber mark and the map caliber index field area in the benchmark map index record to determine the preset cable operation benchmark map corresponding to the cable to be evaluated. Next, the continuous degradation slope field, degradation transition slope field, interval degradation slope field, start timestamp of each slice, and end timestamp of each slice are read from the cable degradation fluctuation slope characteristic quantity. Based on the continuous degradation slope field, degradation transition slope field, interval degradation slope field, start timestamp of each slice, and end timestamp of each slice, the cable normal aging slope tolerance limits corresponding to the applicable cable type field, applicable insulation material field, applicable voltage level field, applicable laying environment field, applicable power outage test caliber field, and applicable time interval field are retrieved from the preset cable operation benchmark map to form a slope tolerance limit retrieval record. The slope tolerance limit retrieval record is used to record the cable normal aging slope tolerance limits, map caliber index field, map data pointing field, and boundary source field used in this matching test, so that the source of the cable normal aging slope tolerance limits can be read back in subsequent coverage intersection determination.

[0117] Preferably, before determining the overlap between the cable degradation fluctuation slope characteristic and the cable normal aging slope tolerance limit, a slope caliber consistency check is performed: the continuous degradation slope field area, degradation transition slope field area, and interval degradation slope field area in the cable degradation fluctuation slope characteristic are read, and the continuous degradation slope tolerance field area, degradation transition slope tolerance field area, and interval degradation slope tolerance field area in the cable normal aging slope tolerance limit are also read; subsequently, based on the slope tolerance limit, the applicable power outage test caliber field, applicable cable type field, applicable insulation material field, applicable voltage level field, and applicable laying environment field in the record are retrieved, and it is checked whether the above field areas come from the same power outage test caliber, the same time caliber conversion processing, the same cable type mark, the same insulation material type mark, the same voltage level mark, and the same laying environment mark, so as to form a slope caliber consistency record. The slope caliber consistency record is used to limit whether the characteristic value of the slope of cable degradation fluctuation and the tolerance limit of the slope of normal aging of cable can enter the coverage intersection judgment. When the slope caliber consistency record indicates that the two are consistent, the coverage intersection judgment continues to be performed so that slope data from different dimension sources, different test caliber sources or different cable types will not be directly compared.

[0118] Preferably, the specific implementation process of the step "determining whether the cable degradation fluctuation slope characteristic quantity and the cable normal aging slope tolerance limit have a coverage intersection" is as follows: First, read the continuous degradation slope field area in the cable degradation fluctuation slope characteristic quantity, and read the continuous degradation slope tolerance field area in the cable normal aging slope tolerance limit. Perform field range overlap determination on the continuous degradation slope field area and the continuous degradation slope tolerance field area to form a continuous degradation coverage intersection record; then, read the degradation transition slope field area and the degradation transition slope tolerance field area, and perform field range overlap determination on the degradation transition slope field area and the degradation transition slope tolerance field area to form a degradation transition coverage intersection record; then read the interval degradation slope field area and the interval degradation slope tolerance field area, and perform field range overlap determination on the interval degradation slope field area and the interval degradation slope tolerance field area to form an interval degradation coverage intersection record. The technical essence of the overlap test is to compare the rate of degradation of the cable under evaluation during continuous power outage testing with the rate of degradation of the same type of cable under normal aging conditions. If there is an overlap between the corresponding fields, the corresponding degradation change still falls within the normal aging reference range. If there is no overlap between the corresponding fields, the corresponding degradation change has deviated from the normal aging reference range.

[0119] Preferably, the continuous degradation coverage intersection record is formed as follows: read the polarization-side degradation slope component, dielectric loss-side degradation slope component, and continuous deviation slope component in the continuous degradation slope field area, and read the polarization-side normal aging slope boundary, dielectric loss-side normal aging slope boundary, and continuous deviation from normal aging boundary in the continuous degradation slope tolerance field area respectively; then, determine the field range overlap between the polarization-side degradation slope component and the polarization-side normal aging slope boundary, determine the field range overlap between the dielectric loss-side degradation slope component and the dielectric loss-side normal aging slope boundary, and determine the field range overlap between the continuous deviation slope component and the continuous deviation from normal aging boundary to form the continuous degradation coverage intersection record. The degradation transition coverage intersection records and the interval degradation coverage intersection records are formed using the same field range overlap determination method as the continuous degradation coverage intersection records. The difference is that the degradation transition coverage intersection records read the degradation transition slope field area and the degradation transition slope tolerance field area, while the interval degradation coverage intersection records read the interval degradation slope field area and the interval degradation slope tolerance field area. Through the above field range overlap determination, the polarization-side degradation slope component, the dielectric loss-side degradation slope component, and the continuous deviation slope component are all determined according to their respective field boundaries, avoiding the mixing of the polarization side, dielectric loss side, and continuous deviation state into a single determination value that cannot be read back.

[0120] Preferably, after the continuous degradation coverage intersection record, degradation transition coverage intersection record, and interval degradation coverage intersection record are formed, they are first written into the matching test process record. Then, the matching test process record is read, and it is determined whether all three records have overlapping fields corresponding to the cable's normal aging slope tolerance limit, thus forming a matching test judgment result. When the matching test judgment result indicates that at least one field area does not have a field overlap relationship, it is confirmed that the cable degradation fluctuation slope characteristic quantity and the cable's normal aging slope tolerance limit do not have a coverage intersection, and a matching test failure confirmation record is generated. The reason for the failure of the matching test for the preset cable operating benchmark map is that the preset cable operating benchmark map records the range of tolerable degradation rate of the same type of cable under normal aging conditions. However, the cable degradation fluctuation slope characteristic has deviated from the range of degradation rate in at least one field area. This indicates that the degradation change of the cable to be evaluated should not be interpreted according to the normal aging path and needs to be processed by reverse backtracking mapping.

[0121] Preferably, after the matching test failure confirmation record is formed, the field areas without overlapping fields are first read from the matching test process record, and the corresponding continuous degradation segment record, degradation transition segment record, or interval degradation segment record is read from the cable degradation fluctuation slope characteristic quantity. Subsequently, the cable operation fingerprint slice sequence, slice nonlinear trend record, cable local deterioration characteristic quantity, and cable test entry timestamp corresponding to the field area are read back through the degradation indicator source record to form the reverse inference trigger source record. The reverse inference trigger source record includes the source of the mismatch field area, the source of the mismatch degradation segment, the source of the mismatch cable operation fingerprint slice sequence, the source of the mismatch slice nonlinear trend record, the source of the mismatch cable local deterioration characteristic quantity, and the source of the mismatch cable test entry timestamp; the reverse inference trigger source record is used to record the degradation source, time source, and field source of the matching test failure confirmation record. The reverse simulation trigger source record continues to participate in the generation of the start-up wake-up signal, enabling the cable construction reverse simulation engine to receive cable degradation feature indicators related to the failure of the matching check when entering the reverse backtracking mapping state, instead of just receiving a failure flag indicating a missing source path.

[0122] Preferably, the specific implementation process of the step "in response to the confirmation result of the matching test failure, send a start-up wake-up signal to the cable construction reverse engineering engine" is as follows: First, read the matching test failure confirmation record, the reverse engineering trigger source record, the cable degradation characteristic indicator, the cable degradation fluctuation slope characteristic quantity, the cable identifier of the cable to be evaluated, and the slope tolerance limit retrieval record; then, write the above data into the reverse engineering start-up load. The reverse engineering start-up load includes the cable identifier field, the degradation characteristic indicator field, the fluctuation slope field, the baseline spectrum matching failure field, the trigger source field, and the baseline spectrum source field; the cable identifier field is used to limit the cable to be evaluated corresponding to the reverse backtracking mapping process, the degradation characteristic indicator field is used to carry the cable degradation characteristic indicator, the fluctuation slope field is used to carry the cable degradation fluctuation slope characteristic quantity, the baseline spectrum matching failure field is used to carry the matching test failure confirmation record, the trigger source field is used to carry the reverse engineering trigger source record, and the baseline spectrum source field is used to carry the slope tolerance limit retrieval record. Then, a start-up wake-up signal is generated based on the reverse-engineered start-up load and sent to the cable construction reverse-engineering engine. The start-up wake-up signal is used to enable the cable construction reverse-engineering engine to read the reverse-engineered start-up load and place the cable degradation characteristic indicator into the pending input position of the reverse backtracking mapping process.

[0123] Preferably, after receiving the start-up wake-up signal, the cable construction reverse engineering engine first reads the reverse engineering start-up load in the start-up wake-up signal and performs field integrity verification on the cable identification field, degradation feature indicator field, fluctuation slope field, baseline spectrum matching failure field, trigger source field, and baseline spectrum source field in the reverse engineering start-up load to form a reverse engineering load verification record. Subsequently, when the reverse engineering load verification record indicates that the reverse engineering start-up load has a complete field source, the engine receiving status flag of the cable construction reverse engineering engine is configured to receive the reverse backtracking mapping status of the cable degradation feature indicator, and a reverse backtracking mapping receiving record is established. The reverse backtracking mapping receiving record is used to record the correspondence between the cable degradation feature indicator, the cable degradation fluctuation slope feature quantity, the matching failure confirmation record, the reverse engineering trigger source record, and the slope tolerance limit retrieval record. Subsequently, when the cable degradation feature indicator is input into the cable construction reverse engineering engine to perform reverse backtracking mapping processing, the cable construction reverse engineering engine can read the trigger source, degradation segment source, and baseline spectrum deviation source based on the reverse backtracking mapping receiving record.

[0124] Preferably, in one scenario, the cable to be evaluated is a power cable that has undergone multiple operating cycles after being laid underground. The cable degradation characteristic indicator includes continuous degradation segment records, degradation transition segment records, and interval degradation segment records. When performing a matching test on this power cable, firstly, a local degradation period status record is formed based on multiple local cable degradation characteristic quantities in the cable degradation characteristic indicator. Then, a polarization-side period difference record, a dielectric loss-side period difference record, and a continuous deviation connection record are formed based on adjacent local degradation period status records. Subsequently, the slope caliber of the polarization-side period difference record, the dielectric loss-side period difference record, and the continuous deviation connection record is converted to form a cable degradation fluctuation slope characteristic quantity. Then, based on the cable type classification record of the cable to be evaluated, the cable normal aging slope tolerance limit is retrieved from the preset cable operation benchmark map, and a coverage intersection determination is performed between the cable degradation fluctuation slope characteristic quantity and the cable normal aging slope tolerance limit. When the characteristic value of the slope representing the cable degradation fluctuation does not fall within the allowable degradation rate range under normal aging conditions of the same type of cable, a matching test failure confirmation record is generated, and a start-up wake-up signal is sent to the cable construction reverse engineering engine based on the matching test failure confirmation record. This processing method differs from the method of directly comparing a single test field with a fixed threshold. It uses the time-series degradation information in the cable degradation characteristic indicator to perform a matching test with the normal aging reference in the preset cable operation benchmark map, so that the triggering basis for the reverse backtracking mapping process comes from continuous degradation changes rather than isolated over-limit points.

[0125] Optionally, before inputting the cable degradation feature indicator into the cable construction reverse engineering engine to perform reverse backtracking mapping processing and output the cable construction tensile node record table, the method further includes: collecting abnormal cable operation fingerprint feature sequences corresponding to historical cables, the abnormal cable operation fingerprint feature sequences being used to characterize the abnormal operation performance degradation features exhibited by historical cables in historical power outage tests; obtaining the historical cable construction variable array generated during the deployment of historical cables; obtaining the historical cable tensile parameter array generated during the deployment of historical cables; establishing a first mapping association node between the abnormal cable operation fingerprint feature sequences and the historical cable construction variable array; establishing a second mapping association node between the abnormal cable operation fingerprint feature sequences and the historical cable tensile parameter array; constructing a cable construction deduction feature mapping library based on the first and second mapping association nodes, and configuring the cable construction deduction feature mapping library as the retrieval basis for the cable construction reverse engineering engine to construct the cable construction reverse engineering engine.

[0126] Preferably, before inputting the cable degradation characteristic indicator into the cable construction reverse engineering engine to perform reverse backtracking mapping processing, a historical cable sample collection record is first established. This record includes historical cable identifiers, historical cable type markers, historical insulation material type markers, historical voltage level markers, historical laying environment markers, and historical power outage test caliber markers. Subsequently, the historical cable sample collection record is correlated with the cable type classification record of the cable to be evaluated to form a historical cable sample screening record. This record limits the historical cables entering subsequent processing to those to be evaluated based on their corresponding cable type, insulation material, voltage level, laying environment, and power outage test caliber. Based on historical cable sample screening records, the historical cable operation fingerprint sequence, historical cable test entry timestamp, historical cable local degradation characteristics, historical cable degradation indicator, and historical matching test failure confirmation record corresponding to the historical cable sample collection record are retrieved from the historical power outage test archive. These historical cable operation fingerprint sequences, historical cable test entry timestamps, historical cable local degradation characteristics, historical cable degradation indicator, and historical matching test failure confirmation records are then written into the historical power outage test sample reading record. The historical power outage test sample reading record is further used to determine the abnormal cable operation fingerprint characteristic sequence, thus limiting the source of the abnormal cable operation fingerprint characteristic sequence to historical cable samples with the same power outage test caliber as the cable to be evaluated.

[0127] Preferably, when determining the abnormal cable operation fingerprint feature sequence, the historical cable operation fingerprint sequence and historical cable test entry timestamp are first read from the historical power outage test sample reading record. Using the historical cable test entry timestamp as the time reading caliber, the historical cable operation fingerprint sequence undergoes the same segmented tracing processing as the cable to be evaluated, thus forming a historical segmented tracing verification record. The historical segmented tracing verification record includes historical continuous degradation segment records, historical degradation turning point segment records, historical interval degradation segment records, historical cable operation fingerprint slice sequences, historical slice nonlinear trend records, and historical localized deterioration continuation records. Historical continuous degradation segment records are used to define degradation segments of the historical cable that continuously intensify within the continuous tracing period; historical degradation turning point segment records are used to define degradation segments of the historical cable that undergo a change in degradation direction or degradation magnitude within the continuous tracing period; and historical interval degradation segment records are used to define degradation segments of the historical cable where the degradation direction remains consistent before and after a time gap exists. Subsequently, the historical segmented tracing verification record and historical matching verification failure confirmation records are processed to correspond their sources, thus forming a historical abnormal operation status determination record. Historical abnormal operation status determination records are used to record the source of determination that the degraded segments in the historical cable operation fingerprint sequence have deviated from the normal aging reference range of the same type of cable, and continue to participate in the formation process of abnormal cable operation fingerprint feature sequence.

[0128] Preferably, the abnormal cable operation fingerprint feature sequence is formed as follows: First, historical continuous degradation segment records, historical degradation transition segment records, or historical interval degradation segment records marked as abnormal are read from the historical abnormal operation status judgment record. Based on the aforementioned degradation segments marked as abnormal, the corresponding historical cable operation fingerprint slice sequence is read back from the historical segmented tracking and review record. Subsequently, the polarization state field area, dielectric loss state field area, historical cable test entry timestamp, historical cable local degradation feature quantity, and historical cable degradation feature indicator are read item by item from the read-back historical cable operation fingerprint slice sequence. These are then time-series encapsulated according to the chronological order of the historical cable test entry timestamps to form the abnormal cable operation fingerprint feature sequence. Then, based on the degradation segment type, historical cable local degradation feature quantity, and historical cable degradation feature indicator corresponding to the historical continuous degradation segment records, historical degradation transition segment records, or historical interval degradation segment records, abnormal operation performance degradation features are formed and written into the corresponding sequence position in the abnormal cable operation fingerprint feature sequence. The technical essence of the abnormal cable operation fingerprint feature sequence is a low-dimensional temporal feature carrier of the abnormal operation performance degradation process formed by historical cables during historical power outage tests. Each sequence position in the low-dimensional temporal feature carrier retains polarization-side degradation changes, dielectric loss-side degradation changes, historical cable test recording timestamps, historical degradation fragment sources, and abnormal operation performance degradation features. This allows subsequent establishment of mapping association nodes to reference historical cable construction variable source records and historical cable tensile parameter source records based on historical cable test recording timestamps, historical degradation fragment sources, and abnormal operation performance degradation features.

[0129] Preferably, after forming the fingerprint feature sequence of abnormal cable operation, the historical cable deployment file corresponding to the historical cable is also read, and historical cable laying construction records, historical cable segment division records, historical cable path turning records, historical cable traction end records, historical cable guide component layout records, historical cable laying environment records, and historical cable construction time records are retrieved from the historical cable deployment file. Subsequently, based on the historical cable segment division records, the historical cable laying path is divided into multiple historical cable segments, and a historical cable segment identifier is configured for each historical cable segment; the historical cable segment identifier is simultaneously written into the historical cable laying construction records, historical cable path turning records, historical cable traction end records, historical cable guide component layout records, historical cable laying environment records, and historical cable construction time records to form a historical cable construction variable source record. The historical cable construction variable source record is used to carry the construction path, historical cable segment, path turning, traction end position, guide component layout, laying environment, and construction time source formed during the deployment of the historical cable, and is used to establish a correspondence between the above construction stage information and the historical cable segment identifier. The historical cable construction variable source record is further used to generate a historical cable construction variable array.

[0130] Preferably, the historical cable construction variable array is generated as follows: First, multiple historical cable segment identifiers are read from the historical cable construction variable source record, and the multiple historical cable segment identifiers are sequentially encoded according to the laying direction of the historical cable to form the array rows of the historical cable construction variable array; then, the construction variable fields in the historical cable construction variable source record are read, and the path turning field, laying depth field, trench constraint field, guide component spacing field, traction end position field, bending radius diameter field, laying environment field, and construction time field are configured as the array columns of the historical cable construction variable array. Then, according to the intersection of the array row and array column, the construction variable field values ​​under the corresponding historical cable segment identifier are written into the array intersection element of the historical cable construction variable array, and a source correspondence relationship is established between each array intersection element and the historical cable construction variable source record. Each row in the historical cable construction variable array represents a historical cable segment, each column represents a construction variable field, and the array intersection element at the intersection of the array row and array column represents the construction status field value of the corresponding historical cable segment under the corresponding construction variable field. The technical essence of the historical cable construction variable array is to convert the construction path constraints, construction space constraints, guidance layout constraints, and laying environment constraints in the historical cable deployment process into data-driven construction variable expressions arranged by segments. The data-driven construction variable expressions continue to participate in the establishment of the first mapping association node, enabling the first mapping association node to read the corresponding construction variable field values ​​from the segment dimension.

[0131] Preferably, when obtaining the historical cable tension parameter array generated during the deployment of historical cables, the historical cable traction equipment record, historical cable traction force sampling record, historical cable traction speed record, historical cable tension fluctuation record, historical cable traction time record, and historical cable traction section corresponding record are first read from the historical cable deployment archive. Then, based on the historical cable traction section corresponding record, the historical cable traction equipment record, historical cable traction force sampling record, historical cable traction speed record, historical cable tension fluctuation record, and historical cable traction time record are respectively linked back to the corresponding historical cable section identifier to form a historical cable tension parameter source record. The historical cable tension parameter source record is used to carry the traction equipment source, traction force amplitude, traction force duration, traction force variation, traction speed, tension fluctuation, and traction time source generated by traction operations during the deployment of historical cables, and is used to establish a correspondence between the above tension parameter information and the historical cable section identifier. The historical cable tension parameter source record is further used to generate the historical cable tension parameter array, so that the historical cable tension parameter array can use the same historical cable section identifier caliber as the historical cable construction variable array.

[0132] Preferably, the historical cable tensile parameter array is generated as follows: First, multiple historical cable segment identifiers from the historical cable tensile parameter source record are read, and the results are encoded and processed according to the same segment order as the historical cable construction variable array to form the array rows of the historical cable tensile parameter array; then, the tensile parameter fields from the historical cable tensile parameter source record are read, and the peak traction force field, traction force duration field, traction force variation range field, traction speed field, tension fluctuation field, traction time field, and traction equipment source field are configured as the array columns of the historical cable tensile parameter array. Next, according to the intersection of the array rows and array columns, the tensile parameter field values ​​under the corresponding historical cable segment identifier are written into the array intersection element of the historical cable tensile parameter array, and a source correspondence is established between each array intersection element and the historical cable tensile parameter source record. Each row in the historical cable tensile parameter array represents a historical cable segment, each column represents a tensile parameter field, and the array intersection element at the intersection of the array row and array column represents the tensile state field value of the corresponding historical cable segment under the corresponding tensile parameter field. The technical essence of the historical cable tension parameter array is to convert the source of traction equipment, traction force status, traction duration status, traction speed status and tension fluctuation status during the historical cable deployment process into a data-driven tension parameter expression arranged by segments. The data-driven tension parameter expression continues to participate in the establishment of the second mapping association node, enabling the second mapping association node to read the corresponding tension parameter field value from the segment dimension.

[0133] Preferably, before establishing the first mapping association node, the abnormal cable operation fingerprint feature sequence and the historical cable construction variable array are processed for segment time correspondence: first, the historical cable test entry timestamp, historical cable local degradation feature quantity, historical cable degradation feature indicator and abnormal operation performance degradation feature in the abnormal cable operation fingerprint feature sequence are read, and the historical cable segment identifier, path turning field, laying depth field, trench constraint field, guide component spacing field, traction end position field, bending radius diameter field, laying environment field and construction time field in the historical cable construction variable array are read; then, according to the historical cable segment division record and construction time field, the abnormal operation performance degradation feature is pointed back to the corresponding historical cable segment identifier to form the first mapping pre-correspondence record. The first mapping pre-correspondence record includes fields for the source of abnormal operating performance degradation characteristics, historical cable segment identifiers, historical cable test entry timestamps, construction variable field sources, and construction time sources. This first mapping pre-correspondence record records the segment correspondence between abnormal operating performance degradation characteristics and construction variable fields, and is used to define which segment of degradation change in the abnormal cable operating fingerprint feature sequence can be associated with which row of the historical cable construction variable array's array intersection element. The first mapping pre-correspondence record is then used to establish the first mapping association node.

[0134] Preferably, the first mapping association node is established as follows: First, the abnormal operation performance degradation characteristics, historical cable section identifiers, historical cable test entry timestamps, and construction variable field sources from the first mapping predecessor corresponding record are read, and the abnormal operation performance degradation characteristics are written into the abnormal operation characteristic field area of ​​the first mapping association node; then, the array row corresponding to the historical cable section identifier in the historical cable construction variable array is written into the construction variable array row field area of ​​the first mapping association node, and the path turning field, laying depth field, trench constraint field, guide component spacing field, traction end position field, bending radius diameter field, laying environment field, and construction time field in the array row are written into the construction variable field area of ​​the first mapping association node. Finally, the historical cable section identifier, historical cable test entry timestamp, first mapping predecessor corresponding record, and historical cable construction variable source record are written into the section time source field area of ​​the first mapping association node to form the first mapping association node. The technical essence of the first mapping association node is to establish a segment-level source relationship between the abnormal operating performance degradation features in the abnormal cable operation fingerprint feature sequence and the construction variable fields formed during historical cable deployment. The first mapping association node is used to express the association between the abnormal operating performance degradation features and construction path constraints, construction space constraints, guidance layout constraints, and laying environment constraints. The first mapping association node is further used to perform node pairing processing with the second mapping association node, so that the construction variable fields and tension parameter fields can establish a correspondence around the same abnormal operating performance degradation feature.

[0135] Preferably, before establishing the second mapping association node, tension-time correspondence processing is performed on the abnormal cable operation fingerprint feature sequence and the historical cable tension parameter array: first, the historical cable test entry timestamp, historical cable local degradation feature quantity, historical cable degradation feature indicator, and abnormal operation performance degradation feature in the abnormal cable operation fingerprint feature sequence are read, and the historical cable section identifier, traction force peak field, traction force duration field, traction force change amplitude field, traction speed field, tension fluctuation field, traction time field, and traction equipment source field in the historical cable tension parameter array are read; then, according to the historical cable traction section correspondence record and traction time field, the abnormal operation performance degradation feature is pointed back to the corresponding historical cable section identifier to form the second mapping pre-correspondence record. The second mapping preceding correspondence record includes fields for the source of abnormal operating performance degradation characteristics, historical cable segment identifiers, historical cable test entry timestamps, tensile parameter field sources, and traction time sources. This second mapping preceding correspondence record records the segmental correspondence between abnormal operating performance degradation characteristics and tensile parameter fields, and defines which segment of degradation change in the abnormal cable operating fingerprint feature sequence can be associated with which row of array intersection elements in the historical cable tensile parameter array. The second mapping preceding correspondence record is further used to establish the second mapping association nodes.

[0136] Preferably, the second mapping association node is established as follows: First, the abnormal operating performance degradation characteristics, historical cable segment identifiers, historical cable test entry timestamps, and tensile parameter field sources from the corresponding record before the second mapping are read, and the abnormal operating performance degradation characteristics are written into the abnormal operating characteristic field area of ​​the second mapping association node; then, the array row corresponding to the historical cable segment identifier in the historical cable tensile parameter array is written into the tensile parameter array row field area of ​​the second mapping association node, and the peak traction force field, traction force duration field, traction force variation amplitude field, traction speed field, tension fluctuation field, traction time field, and traction equipment source field in the array row are written into the tensile parameter field area of ​​the second mapping association node. Finally, the historical cable segment identifier, historical cable test entry timestamp, corresponding record before the second mapping, and historical cable tensile parameter source record are written into the segment time source field area of ​​the second mapping association node to form the second mapping association node. The technical essence of the second mapping association node is to establish a segment-level source relationship between the abnormal operating performance degradation features in the abnormal cable operation fingerprint feature sequence and the tensile parameter field formed during historical cable deployment. The second mapping association node is used to express the correlation between the abnormal operating performance degradation features and the source of the traction equipment, traction force amplitude, traction force duration, traction force variation, traction speed, and tension fluctuation. The second mapping association node is further used to perform node pairing processing with the first mapping association node, so that the tensile parameter field and the construction variable field can establish a corresponding relationship around the same abnormal operating performance degradation feature.

[0137] Preferably, after the first and second mapping associated nodes are formed, the abnormal operation characteristic field area, construction variable field area, and section time source field area in the first mapping associated node are read first, and the abnormal operation characteristic field area, tensile parameter field area, and section time source field area in the second mapping associated node are read. Subsequently, based on the same historical cable section identifier, the same historical cable test entry timestamp range, and the same abnormal operation performance degradation characteristic, the first and second mapping associated nodes are paired to form a mapping associated node pairing record. The mapping associated node pairing record includes the abnormal operation performance degradation characteristic field, the historical cable section identifier field, the construction variable node field, the tensile parameter node field, the historical cable test entry timestamp field, and the node pairing source field. The mapping association node pairing record is used to record the source of construction variables and tension parameters corresponding to the same abnormal operational performance degradation characteristic, and to distinguish the technical functions of the first mapping association node and the second mapping association node: the first mapping association node provides the source of construction path constraints, construction space constraints, guide layout constraints, and laying environment constraints; the second mapping association node provides the source of traction equipment, traction force amplitude, traction force continuity, traction force variation, traction speed, and tension fluctuation. The mapping association node pairing record is further used to construct the cable construction simulation feature mapping library, enabling the cable construction simulation feature mapping library to simultaneously read the construction variable fields and tension parameter fields under the same historical cable section.

[0138] Preferably, when constructing the cable construction simulation feature mapping library, the mapping association node pairing records are first read, and the first mapping association node, second mapping association node, historical cable section identifier, historical cable test entry timestamp, abnormal operation performance degradation characteristics, construction variable field, and tensile parameter field are read from the mapping association node pairing records. Then, an abnormal operation characteristic index field is established for the cable construction simulation feature mapping library based on the abnormal operation performance degradation characteristics, a section index field is established based on the historical cable section identifier, a construction variable index field is established based on the construction variable field, and a tensile parameter index field is established based on the tensile parameter field. Finally, the first mapping association node, second mapping association node, mapping association node pairing records, historical cable construction variable array, historical cable tensile parameter array, historical cable construction variable source record, and historical cable tensile parameter source record are written into the cable construction simulation feature mapping library to form a cable construction simulation feature mapping library that can be read back according to the abnormal operation performance degradation characteristics, historical cable section identifier, construction variable field, and tensile parameter field. The technical essence of the cable construction simulation feature mapping library is a data mapping library that establishes an index relationship between the abnormal operating performance degradation characteristics in historical power outage tests and the construction variable fields and tensile parameter fields in the historical cable deployment stage according to the historical cable section identifier; the cable construction simulation feature mapping library continues to be used as the retrieval basis for configuring the cable construction reverse simulation engine.

[0139] Preferably, after the cable construction simulation feature mapping library is formed, a mapping source verification process is performed on the library: First, the first and second mapping association nodes in the library are read, and it is verified whether the first mapping association node can be read back to the abnormal cable operation fingerprint feature sequence and the historical cable construction variable array, and whether the second mapping association node can be read back to the abnormal cable operation fingerprint feature sequence and the historical cable tensile parameter array, to form a mapping source verification record; then, the mapping association node pairing record is read, and it is verified whether the first and second mapping association nodes in the pairing record correspond to the same historical cable section identifier, the same historical cable test entry timestamp range, and the same abnormal operation performance degradation feature, to form a mapping pairing verification record. Finally, the mapping source verification record and the mapping pairing verification record are written into the mapping verification field area of ​​the cable construction simulation feature mapping library. The mapping verification field is used to mark mapping records in the cable construction simulation feature mapping library that can be read by subsequent reverse backtracking mapping processing. This ensures that mapping records lacking abnormal performance degradation feature sources, construction variable sources, or tensile parameter sources will not enter the retrieval process of the cable construction reverse simulation engine. The mapping verification field continues to participate in the formation process of the retrieval entry configuration record.

[0140] Preferably, when configuring the cable construction simulation feature mapping library as the retrieval basis for the cable construction reverse simulation engine, the abnormal operation feature index field, section index field, construction variable index field, tension parameter index field, and mapping verification field area in the cable construction simulation feature mapping library are first read, and these fields are then written into the retrieval entry configuration record of the cable construction reverse simulation engine. Subsequently, the retrieval path record of the cable construction reverse simulation engine is established based on the retrieval entry configuration record. The retrieval path record includes the abnormal operation feature retrieval path, section back-index retrieval path, construction variable back-index retrieval path, and tension parameter back-index retrieval path. The abnormal operation feature retrieval path is used to back-read the corresponding abnormal cable operation fingerprint feature sequence based on the subsequently input cable degradation feature indicator. The section back-index retrieval path is used to back-read the corresponding historical cable section identifier based on the abnormal cable operation fingerprint feature sequence. The construction variable back-index retrieval path is used to back-read the first mapping association node based on the historical cable section identifier. The tension parameter back-index retrieval path is used to back-read the second mapping association node based on the historical cable section identifier. The retrieved path records are then used to build the cable construction reverse engineering engine.

[0141] Preferably, the cable construction reverse engineering engine is constructed as follows: First, the retrieval entry configuration record, retrieval path record, cable construction deduction feature mapping library, and mapping verification field area are read, and a reverse backtracking mapping input record is established. This reverse backtracking mapping input record is used to receive subsequent cable degradation feature indicators and to convert continuous degradation segment records, degradation transition segment records, interval degradation segment records, and cable test entry timestamps from the cable degradation feature indicators into searchable abnormal operation feature fields. Subsequently, a correspondence is established between the reverse backtracking mapping input record and the abnormal operation feature retrieval path to form a reverse backtracking mapping retrieval record. Then, the reverse backtracking mapping retrieval record is sequentially linked to the section backtracking retrieval path, the construction variable backtracking retrieval path, and the tension parameter backtracking retrieval path to construct the cable construction reverse engineering engine. The technical essence of the cable construction reverse simulation engine is to use the cable construction simulation feature mapping library as the retrieval basis to reverse map abnormal operation performance degradation characteristics to the data retrieval and mapping processing structure of historical cable section identifiers, construction variable fields and tension parameter fields. The cable construction reverse simulation engine is then used to perform subsequent reverse backtracking mapping processing to output the cable construction tension node record table.

[0142] Preferably, in one scenario, the historical cable is an underground power cable that shares the same cable type, insulation material type, voltage level, laying environment, and power outage test caliber as the cable to be evaluated. When constructing the cable construction reverse engineering engine, the historical cable operation fingerprint sequence is first read from the historical power outage test archives of the historical cable, and the abnormal cable operation fingerprint feature sequence is determined through historical segmented tracking and verification records and historical matching failure confirmation records. Subsequently, historical cable construction variable arrays and historical cable tensile parameter arrays are generated from the historical cable deployment archives. Then, a segment-level source relationship is established between the abnormal cable operation fingerprint feature sequence and the historical cable construction variable array through a first mapping association node, and a segment-level source relationship is established between the abnormal cable operation fingerprint feature sequence and the historical cable tensile parameter array through a second mapping association node. Finally, a cable construction deduction feature mapping library is constructed based on the pairing records of the first mapping association node, the second mapping association node, and the mapping association node, and this library is configured as the retrieval basis for the cable construction reverse engineering engine. This processing method differs from the experience query method based solely on a single construction record. It establishes a mapping relationship between the abnormal operating performance degradation characteristics in historical power outage tests, the construction variable fields during historical cable deployment, and the tensile parameter fields during historical cable deployment, according to the historical cable section identifier. This enables the subsequent reverse backtracking mapping processing of the cable to be evaluated to read the source of construction variables and tensile parameters from the abnormal operating performance degradation characteristics.

[0143] Optionally, the cable degradation feature indicator is input into the cable construction back-engineering to perform reverse backtracking mapping processing to output a cable construction tensile node record table. This includes: extracting the cable performance mutation point features carried in the cable degradation feature indicator using the cable construction back-engineering; retrieving the cable stress damage category identifier corresponding to the cable performance mutation point feature from the cable construction back-engineering feature mapping library; determining the target cable laying location in the cable construction back-engineering feature mapping library based on the cable stress damage category identifier; querying the estimated cable construction tensile attribute data at the target cable laying location based on the cable stress damage category identifier, the estimated cable construction tensile attribute data including cable construction geospatial coordinate information used to locate the cable laying location to be evaluated; generating cable construction tensile node record items based on the estimated cable construction tensile attribute data, the target cable laying location, and the cable test acquisition time information corresponding to the cable performance mutation point feature; and generating a cable construction tensile node record table based on the cable construction tensile node record items.

[0144] Preferably, the specific implementation process of the step "extracting the cable performance mutation point features carried in the cable degradation feature indicator using the cable construction reverse simulation engine" is as follows: After the cable construction reverse simulation engine enters the reverse backtracking mapping state, the reverse backtracking mapping receiving record is read first, and the cable degradation feature indicator, cable degradation fluctuation slope feature quantity, matching test failure confirmation record, reverse simulation trigger source record, and cable identifier of the cable to be evaluated are read from the reverse backtracking mapping receiving record; then, the continuous degradation segment record, degradation transition segment record, interval degradation segment record, and cable test entry timestamp corresponding to each local degradation feature quantity of the cable are read from the cable degradation feature indicator, and the continuous degradation slope field area, degradation transition slope field area, and interval degradation slope field area are read from the cable degradation fluctuation slope feature quantity. Next, the mismatched field areas without overlapping fields in the matching test failure confirmation records are read, and these mismatched field areas are matched with the continuous degradation slope field area, degradation inflection slope field area, and interval degradation slope field area respectively to form the cable performance mutation point extraction source record. The cable performance mutation point extraction source record includes the source of the mismatched field area, the source of the degradation segment, the source of the slope field area, the source of the local degradation characteristic quantity of the cable, the source of the cable test entry timestamp, and the source of the cable identification to be evaluated. The cable performance mutation point extraction source record continues to participate in the subsequent candidate sequence location processing, so that the subsequently extracted cable performance mutation point features can be read back to the cable degradation characteristic indicator, the cable degradation fluctuation slope characteristic quantity, and the matching test failure confirmation record.

[0145] Preferably, the candidate sequence location processing is performed as follows: First, the source of the degradation segment in the source record of the cable performance mutation point extraction is read. When the source of the degradation segment points to the continuous degradation segment record, multiple local cable degradation feature quantities corresponding to the continuous degradation segment record are read. Then, the polarization-side degradation slope component, dielectric loss-side degradation slope component, and continuous deviation slope component in the continuous degradation slope field area are read. Subsequently, according to the order of the cable test recording timestamps, the polarization-side degradation slope component, dielectric loss-side degradation slope component, and continuous deviation slope component between adjacent local cable degradation feature quantities are subjected to continuous enhancement state identification processing to form continuous degradation mutation candidate records. The continuous degradation mutation candidate records include the continuous enhancement start sequence position, the continuous enhancement end sequence position, the continuous enhancement field source, and the continuous enhancement time source. The continuous degradation mutation candidate records are used to record the sequence position in the continuous degradation segment record where the degradation change begins to deviate from the normal aging reference range, and continue to participate in the cable performance mutation point feature encapsulation processing.

[0146] Preferably, the candidate sequence location processing further includes a degradation transition candidate location process: when the source of the degradation segment in the source record of the cable performance mutation point extraction points to the degradation transition segment record, multiple cable local degradation feature quantities corresponding to the degradation transition segment record are first read, and the polarization-side degradation slope component, dielectric loss-side degradation slope component, and continuous deviation slope component in the degradation transition slope field area are read; subsequently, according to the order of the cable test recording timestamps, the degradation direction conversion state and degradation amplitude conversion state between adjacent cable local degradation feature quantities are processed to form a degradation transition mutation candidate record. The degradation transition mutation candidate record includes the sequence position before degradation transition, the sequence position after degradation transition, the source of the degradation transition field, and the source of the degradation transition time; the degradation transition mutation candidate record is used to record the sequence position of the degradation direction conversion state or degradation amplitude conversion state of the polarization-side degradation change, dielectric loss-side degradation change, or continuous deviation state in the degradation transition segment record, and continues to participate in the cable performance mutation point feature encapsulation processing.

[0147] Preferably, the candidate sequence location processing further includes an interval degradation candidate location process: when the source of the degradation segment in the source record of the cable performance mutation point extraction points to the interval degradation segment record, multiple local cable degradation feature quantities corresponding to the interval degradation segment record are first read, and the polarization-side degradation slope component, dielectric loss-side degradation slope component, and continuous deviation slope component in the interval degradation slope field area are read; subsequently, the local cable degradation feature quantities before and after the time gap are read from the interval degradation segment record, and the degradation direction before and after the time gap is maintained by interval continuation location processing to form interval degradation mutation candidate records. The interval degradation mutation candidate records include the sequence position before the interval, the sequence position after the interval, the source of the interval degradation field, and the source of the interval degradation time; the interval degradation mutation candidate records are used to record the sequence positions in the interval degradation segment record that still maintain the degradation direction after crossing the time gap, and continue to participate in the cable performance mutation point feature encapsulation processing.

[0148] Preferably, the encapsulation process for cable performance mutation point features is as follows: First, read the candidate records for continuous degradation mutations, candidate records for degradation transition mutations, and candidate records for interval degradation mutations. Then, extract the source of the mismatch field area from the source record based on the cable performance mutation point, and select the mutation candidate record corresponding to the source of the mismatch field area for encapsulation. Subsequently, read the mutation segment type, mutation sequence position, cable test recording timestamp, polarization-side degradation slope component, dielectric loss-side degradation slope component, continuous deviation slope component, and degradation segment source from the selected mutation candidate record. Next, convert the cable test recording timestamp into cable test acquisition time information, and establish a time-position correspondence between the cable test acquisition time information and the mutation sequence position. Write the polarization-side change direction and polarization-side change amplitude in the polarization-side degradation slope component into the polarization mutation field area; write the dielectric loss-side change direction and dielectric loss-side change amplitude in the dielectric loss-side degradation slope component into the dielectric loss mutation field area; write the continuous deviation direction and continuous deviation continuation state in the continuous deviation slope component into the continuous deviation mutation field area to form the cable performance mutation point feature. The characteristics of cable performance mutation points include mutation segment type field, mutation sequence location field, polarization mutation field area, dielectric loss mutation field area, continuous deviation mutation field area, cable test acquisition time information, mismatch field area source, degradation segment source, and cable identification field to be evaluated. The technical essence of cable performance mutation point characteristics is to extract time-series mutation data from cable degradation characteristic indicators to characterize the degradation changes of the cable to be evaluated that deviate from the normal aging reference range.

[0149] Preferably, after the cable performance mutation point characteristics are formed, the reverse backtracking mapping input record is first read, and the mutation segment type field, polarization mutation field area, dielectric loss mutation field area, continuous deviation mutation field area, cable test acquisition time information, and mismatch field area source in the cable performance mutation point characteristics are written into the reverse backtracking mapping input record to form an abnormal operation feature retrieval input record. Subsequently, the abnormal operation feature retrieval input record is compared with the abnormal operation feature index field in the cable construction simulation feature mapping library to form an abnormal operation feature candidate matching record. The index comparison process first filters the abnormal operation performance degradation features corresponding to the segment types in the abnormal operation feature index field according to the mutation segment type field, then performs field homogeneity comparison according to the polarization mutation field area, dielectric loss mutation field area, and continuous deviation mutation field area, and then performs temporal consistency comparison according to the chronological relationship of the cable test acquisition time information, so that the abnormal operation feature candidate matching record can record the segment type correspondence, polarization side mutation correspondence, dielectric loss side mutation correspondence, continuous deviation correspondence, and temporal sequence correspondence between the cable performance mutation point characteristics and the abnormal cable operation fingerprint feature sequence.

[0150] Preferably, after the candidate matching records of abnormal operation features are formed, the mapping verification field area in the cable construction simulation feature mapping library is first read, and the source integrity filtering process is performed on the candidate matching records of abnormal operation features according to the mapping verification field area to form valid matching records of abnormal operation features. The source integrity filtering process includes: verifying whether the candidate matching records of abnormal operation features can be read back to the abnormal cable operation fingerprint feature sequence, verifying whether the candidate matching records of abnormal operation features can be read back to the first mapping association node, verifying whether the candidate matching records of abnormal operation features can be read back to the second mapping association node, and verifying whether the candidate matching records of abnormal operation features can be read back to the mapping association node pairing record. The valid matching records of abnormal operation features include abnormal operation performance degradation features, historical cable section identifiers, the first mapping association node, the second mapping association node, and the mapping association node pairing record; the valid matching records of abnormal operation features are further used to retrieve cable stress damage category identifiers, so that subsequent category retrieval can simultaneously read the source of construction variables and the source of tensile parameters.

[0151] Preferably, when retrieving cable stress damage category identifiers corresponding to cable performance mutation point features from the cable construction simulation feature mapping library, the abnormal operation performance degradation features, historical cable section identifiers, first mapping association nodes, second mapping association nodes, and mapping association node pairing records in the effective matching records of abnormal operation features are read first. Then, the path turning field, laying depth field, trench constraint field, guide component spacing field, traction end position field, bending radius diameter field, laying environment field, and construction time field are read from the construction variable field area of ​​the first mapping association node. The peak traction force field, traction force duration field, traction force variation range field, traction speed field, tension fluctuation field, traction time field, and traction equipment source field are read from the tension parameter field area of ​​the second mapping association node. Then, a path constraint category source record is formed based on the path turning field, bending radius diameter field, and guide component spacing field; a spatial constraint category source record is formed based on the laying depth field, trench constraint field, and laying environment field; and a traction state category source record is formed based on the peak traction force field, traction force duration field, traction force variation range field, traction speed field, and tension fluctuation field. The source records of path constraint category, spatial constraint category, and traction status category continue to be processed by category field combination to form cable stress damage category matching records.

[0152] Preferably, the category field combination processing specifically involves: first, matching the path constraint category source record with the polarization mutation field area to determine whether path turning, bending radius diameter, and guide component spacing correspond to the mutation source of polarization side degradation; then, matching the spatial constraint category source record with the dielectric loss mutation field area to determine whether laying depth, trench constraints, and laying environment correspond to the mutation source of dielectric loss side degradation; and finally, matching the traction state category source record with the continuous deviation mutation field area to determine whether peak traction force, traction force duration, traction force variation amplitude, traction speed, and tension fluctuation correspond to the mutation source of continuous deviation state. The results of the above matching processing are written into the cable stress damage category matching record, and the cable stress damage category identifier is read from the cable stress damage category matching record. The technical essence of the cable stress damage category identifier is that it is a stress damage category identifier data formed by combining and classifying the cable performance mutation point characteristics with construction path constraints, construction space constraints, guide layout constraints, laying environment constraints, and traction force status at the segment level; the cable stress damage category identifier is used to limit the construction stress source type corresponding to the cable performance mutation point characteristics.

[0153] Preferably, after the cable stress damage category identifier is formed, a category source verification record is also established: first, the cable stress damage category identifier is read, and then read back to the path constraint category source record, spatial constraint category source record, and traction state category source record in the cable stress damage category matching record; subsequently, the path constraint category source record is read back to the construction variable field area of ​​the first mapping associated node, the spatial constraint category source record is read back to the construction variable field area of ​​the first mapping associated node, and the traction state category source record is read back to the tension parameter field area of ​​the second mapping associated node, to form a category source verification record. The category source verification record is used to record the construction variable source and tension parameter source of the cable stress damage category identifier, and continues to participate in the target cable laying location determination process, so that the target cable laying location is not simply determined based on the historical cable segment identifier, but based on the construction stress source corresponding to the cable stress damage category identifier.

[0154] Preferably, when determining the target cable laying location in the cable construction simulation feature mapping library based on the cable stress damage category identifier, the historical cable segment identifier, path constraint category source record, spatial constraint category source record, and traction state category source record in the category source verification record are read first. Then, the historical segment location record is read back from the segment index field of the cable construction simulation feature mapping library based on the historical cable segment identifier. Subsequently, the preset overall cable topology map and the segment division record of the cable to be evaluated are read. The laying direction, path turning relationship, guide component arrangement relationship, segment sequence position, and laying environment source in the historical segment location record are mapped with the segment identifier of the cable to be evaluated, the path turning field of the cable to be evaluated, the guide component arrangement field of the cable to be evaluated, the laying environment field of the cable to be evaluated, and the construction time field of the cable to be evaluated in the segment division record of the cable to be evaluated to form a candidate laying location record of the cable to be evaluated. The historical section location record includes historical cable section identification, historical section sequence location, historical path turning relationship, historical guide component layout relationship, historical laying environment source, and historical construction time source; the candidate laying location record of the cable to be evaluated is used to record the candidate corresponding sections of the historical cable section identification on the cable to be evaluated, and continues to participate in the target cable laying location determination process.

[0155] Preferably, the target cable laying location determination process specifically involves: first, reading the cable segment identifier, cable path turning field, cable guide component layout field, cable laying environment field, and cable construction time field from the candidate laying location record of the cable to be evaluated; then, performing field mapping processing between the cable path turning field and the path constraint category source record to form a path constraint location mapping record; performing field mapping processing between the cable laying environment field and the spatial constraint category source record to form a spatial constraint location mapping record; and performing time sequence constraint processing between the cable construction time field and the cable test acquisition time information to form a construction test time mapping record. Next, the path constraint location mapping record, spatial constraint location mapping record, construction test time mapping record, and traction state category source record are written into the target cable laying location determination record. Finally, the cable segment identifiers that correspond to the cable stress damage category identifier are selected from the target cable laying location determination record, and the laying location corresponding to these cable segment identifiers is configured as the target cable laying location. The target cable laying location includes the identification of the cable section to be evaluated, the section sequence location, the topology node location, the path turning relationship, the arrangement relationship of the guide components, the source of the laying environment, and the source of the construction time. The technical essence of the target cable laying location is the candidate construction stress backtracking section of the cable to be evaluated in the preset overall cable topology map.

[0156] Preferably, when querying the estimated cable construction tensile attribute data at the target cable laying location based on the cable stress damage category identifier, the process first reads the identifier of the cable segment to be evaluated at the target cable laying location, and then reads the target cable laying location determination record based on the identifier of the cable segment to be evaluated. Subsequently, the historical cable segment identifier corresponding to the identifier of the cable segment to be evaluated is read back from the target cable laying location determination record, and the corresponding mapping association node pairing record is read from the segment index field of the cable construction deduction feature mapping library based on the historical cable segment identifier. Then, the second mapping association node is read from the mapping association node pairing record, and the peak traction force field, traction force duration field, traction force variation amplitude field, traction speed field, tension fluctuation field, traction time field, and traction equipment source field are read from the tensile parameter field area of ​​the second mapping association node to form a tensile parameter readback record. Finally, the tensile parameter readback record is compared with the cable stress damage category identifier to perform category correspondence verification processing, thus forming a tensile parameter category correspondence record. The category-based verification process is used to verify whether the peak traction force field, tractio...

Claims

1. A method for assessing cable operational performance degradation and tracing construction defects based on inverse problem solving, characterized in that, include: Identify the cable to be evaluated and obtain the cable polarization characteristic sequence and cable dielectric loss characteristic sequence generated by the cable to be evaluated during the power outage test; Based on the cable polarization characteristic sequence and the cable dielectric loss characteristic sequence, a cable operation fingerprint sequence is generated; The cable running fingerprint sequence is subjected to segmented tracking processing to generate cable degradation feature indicators; The cable degradation feature indicator is imported into a preset cable operation benchmark map corresponding to the cable to be evaluated for matching verification. Then, when the matching verification fails, the cable construction reverse simulation engine is triggered. The cable degradation feature indicator is input into the cable construction reverse inference engine to perform reverse backtracking mapping processing, so as to output the cable construction tensile node record table. Based on the cable construction tensile node record table and the preset overall cable topology diagram corresponding to the cable to be evaluated, the cable material damage segment is located, and then a cable construction defect retrospective report is generated for the cable material damage segment.

2. The method according to claim 1, characterized in that, The step of generating a cable operation fingerprint sequence based on the cable polarization characteristic sequence and the cable dielectric loss characteristic sequence includes: Principal component extraction was performed on the cable polarization feature sequence to obtain the cable polarization scalar. The cable polarization scalar is vectorized to generate a cable polarization dimension-reduced vector. Principal component extraction was performed on the cable dielectric loss characteristic sequence to obtain the cable dielectric loss scalar. The scalar value of the cable dielectric loss is vectorized to generate a dimensionality-reduced vector of the cable dielectric loss. Based on the cable polarization dimension reduction vector and the cable dielectric loss dimension reduction vector, the cable operation fingerprint sequence is generated.

3. The method according to claim 2, characterized in that, The cable polarization feature sequence is subjected to principal component extraction to obtain the cable polarization scalar. The cable polarization scalar is vectorized to generate a reduced-dimensional cable polarization vector, including: Retrieve the preset multidimensional reference space corresponding to the cable to be evaluated. The preset multidimensional reference space is pre-configured based on the cable polarization reference characteristic sequence and cable dielectric loss reference characteristic sequence in the historical power outage test samples of the same type of cable. The cable polarization feature sequence is projected onto the preset multidimensional reference space for principal component extraction to obtain the cable polarization scalar. The cable polarization scalar is mapped to the feature coordinate axes corresponding to the preset multidimensional reference space to perform the vectorization construction process, thereby generating the cable polarization dimensionality reduction vector.

4. The method according to claim 3, characterized in that, The cable dielectric loss feature sequence is subjected to principal component extraction to obtain the cable dielectric loss scalar. The scalar value of the cable dielectric loss is vectorized to generate a dimensionality-reduced vector of the cable dielectric loss, including: The cable dielectric loss feature sequence is projected onto the preset multidimensional reference space for principal component extraction to obtain the cable dielectric loss scalar. The cable dielectric loss scalar is mapped to the feature coordinate axis corresponding to the preset multidimensional reference space to perform the vectorization construction process, thereby generating the cable dielectric loss dimensionality reduction vector.

5. The method according to claim 4, characterized in that, The step of generating the cable operation fingerprint sequence based on the cable polarization dimension reduction vector and the cable dielectric loss dimension reduction vector includes: According to the power outage test generation time corresponding to the cable polarization feature sequence and the cable dielectric loss feature sequence, the cable polarization dimension reduction vector and the cable dielectric loss dimension reduction vector are spliced ​​in time order to generate the cable operation fingerprint sequence. Configure the power outage test generation time as a cable test recording timestamp, and associate the cable test recording timestamp with the cable operation fingerprint sequence.

6. The method according to claim 5, characterized in that, The segmented tracing process performed on the cable operating fingerprint sequence to generate cable degradation feature indicators includes: Extract the cable test entry timestamp carried in the cable operation fingerprint sequence. The cable test entry timestamp is derived from the time when the cable polarization characteristic sequence and the cable dielectric loss characteristic sequence are generated during the power outage test of the cable to be evaluated. According to a preset tracking period, the cable operation fingerprint sequence with the cable test recording timestamp is segmented to generate multiple cable operation fingerprint slice sequences in different time intervals. Nonlinear trend tracking processing is performed on each of the cable running fingerprint slice sequences to generate multiple local cable degradation feature quantities; Based on the order of the timestamps entered for the cable tests, a cable degradation feature indicator is generated according to each of the local degradation feature quantities of the cable.

7. A cable operation performance degradation assessment and construction defect backtracking device based on inverse problem solving, characterized in that, include: The cable test feature acquisition module is used to identify the cable to be evaluated and acquire the cable polarization feature sequence and cable dielectric loss feature sequence generated by the cable to be evaluated during the power outage test. The cable operation fingerprint generation module is used to generate a cable operation fingerprint sequence based on the cable polarization characteristic sequence and the cable dielectric loss characteristic sequence; The cable degradation tracking module is used to perform segmented tracking processing on the cable running fingerprint sequence to generate cable degradation feature indicators; The cable reference matching module is used to import the cable degradation feature indicator into a preset cable operation reference map corresponding to the cable to be evaluated for matching verification. Then, when the matching verification fails, the cable construction reverse deduction engine is triggered. The cable reverse backtracking module is used to input the cable degradation feature indicator into the cable construction reverse deduction engine to perform reverse backtracking mapping processing, so as to output the cable construction tensile node record table. The cable damage location and report generation module is used to locate cable material damage segments based on the cable construction tensile node record table and the preset overall cable topology diagram corresponding to the cable to be evaluated, and then generate a cable construction defect retrospective report for the cable material damage segments.

8. An electronic device, characterized in that, It includes a memory and a processor, the memory storing a computer program, and the processor executing the computer program to perform the following processing: Identify the cable to be evaluated and obtain the cable polarization characteristic sequence and cable dielectric loss characteristic sequence generated by the cable to be evaluated during the power outage test; Based on the cable polarization characteristic sequence and the cable dielectric loss characteristic sequence, a cable operation fingerprint sequence is generated; The cable running fingerprint sequence is subjected to segmented tracking processing to generate cable degradation feature indicators; The cable degradation feature indicator is imported into a preset cable operation benchmark map corresponding to the cable to be evaluated for matching verification. Then, when the matching verification fails, the cable construction reverse simulation engine is triggered. The cable degradation feature indicator is input into the cable construction reverse inference engine to perform reverse backtracking mapping processing, so as to output the cable construction tensile node record table. Based on the cable construction tensile node record table and the preset overall cable topology diagram corresponding to the cable to be evaluated, the cable material damage segment is located, and then a cable construction defect retrospective report is generated for the cable material damage segment.

9. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores a computer program that, when executed by a processor, performs the following processing: Identify the cable to be evaluated and obtain the cable polarization characteristic sequence and cable dielectric loss characteristic sequence generated by the cable to be evaluated during the power outage test; Based on the cable polarization characteristic sequence and the cable dielectric loss characteristic sequence, a cable operation fingerprint sequence is generated; The cable running fingerprint sequence is subjected to segmented tracking processing to generate cable degradation feature indicators; The cable degradation feature indicator is imported into a preset cable operation benchmark map corresponding to the cable to be evaluated for matching verification. Then, when the matching verification fails, the cable construction reverse simulation engine is triggered. The cable degradation feature indicator is input into the cable construction reverse inference engine to perform reverse backtracking mapping processing, so as to output the cable construction tensile node record table. Based on the cable construction tensile node record table and the preset overall cable topology diagram corresponding to the cable to be evaluated, the cable material damage segment is located, and then a cable construction defect retrospective report is generated for the cable material damage segment.

10. A cable operation performance degradation assessment and construction defect backtracking system based on inverse problem solving, characterized in that, include: The cable power outage test data access terminal is configured to identify the cable to be evaluated and acquire the cable polarization characteristic sequence and cable dielectric loss characteristic sequence generated by the cable to be evaluated during the power outage test. The cable operation fingerprint processing terminal is configured to generate a cable operation fingerprint sequence based on the cable polarization characteristic sequence and the cable dielectric loss characteristic sequence, and to perform segmented tracking processing on the cable operation fingerprint sequence to generate a cable degradation characteristic indicator. The cable reference map matching end is configured to import the cable degradation feature indicator into a preset cable operation reference map corresponding to the cable to be evaluated for matching verification, and then trigger the cable construction reverse deduction engine when the matching verification fails. The cable construction reverse backtracking end is configured to input the cable degradation characteristic indicator into the cable construction reverse inference engine to perform reverse backtracking mapping processing, so as to output a cable construction tension node record table; The cable damage location report terminal is configured to locate cable material damage segments based on the cable construction tensile node record table and the preset overall cable topology diagram corresponding to the cable to be evaluated, and then generate a cable construction defect retrospective report for the cable material damage segments.

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