Disc-type insulator AC voltage-withstanding multichannel leakage current detection method and system

Abstract

The invention belongs to the technical field of high-voltage electrical test and detection, and relates to a disc insulator alternating-current voltage-withstanding multichannel leakage current detection method and system, and the method comprises the steps: setting a parameter set which comprises voltage-withstanding voltage, frequency, voltage boosting and stabilizing strategies, sampling parameters, a judgment threshold value and a consistency threshold value, and generating a version identifier; constructing an equipotential boundary and a voltage-sharing electrode, and organizing the high-voltage end of the insulator to be measured, an independent measurement loop and a common grounding reference point; during the voltage boosting and stabilizing period, synchronously sampling each loop to obtain a multi-channel sequence; filtering and windowing the sequence to obtain an effective value and a stability index; channel calibration compensation is carried out, and a consistency index is calculated; and in combination with a threshold value, grounding and communication state output judgment and event marks, voltage reduction or cut-off is carried out during triggering, and structured evidence storage is carried out. The technical scheme of the invention is suitable for alternating current withstand voltage batch detection, and can realize judgment robustness and channel consistency control.

Description

Technical Field

[0001] The present invention belongs to the technical field of high-voltage electrical testing and detection, and particularly relates to a multi-channel leakage current detection method and system for AC withstand voltage of disc insulators. Background Technique

[0002] In the prior art, the detection of leakage current in the AC withstand voltage test of disc insulators usually relies on an AC withstand voltage test device in cooperation with a leakage current meter or a multi-channel acquisition device. By reading the current of the measured circuit during the voltage boosting and voltage stabilizing stages and judging whether it is qualified based on this, it meets the batch detection requirements of factory inspection and operation and maintenance sampling inspection. However, there are some obvious deficiencies in the existing leakage current detection methods in terms of the result consistency of multi-station parallel measurement and the judgment robustness in a strong electromagnetic environment.

[0003] In practical applications, the electric field distribution, wiring layout, and public reference point organization method in the AC withstand voltage test area are likely to introduce capacitive coupling and electromagnetic induction. The leakage current signal is superimposed with random pulse components such as corona and partial discharge, resulting in a relatively large fluctuation amplitude of the time window of multi-channel readings and a relatively weak comparability between channels. The stability of the discrimination basis based on a simple threshold or single reading is weak, and the result comparability during review and repeated tests is also weak. As a result, the overall accuracy of abnormal event recognition and the consistency of batch judgment are relatively low.

[0004] It can be seen that the prior art often has problems such as low anti-interference robustness and limited control level of result consistency in parallel stations in the batch detection of AC withstand voltage of disc insulators. This is the deficiency of the prior art.

[0005] In view of this, it is very necessary for the present invention to provide a multi-channel leakage current detection method and system for AC withstand voltage of disc insulators to solve the above-mentioned defects existing in the prior art. Summary of the Invention

[0006] The purpose of the present invention is to provide a multi-channel leakage current detection method and system for AC withstand voltage of disc insulators to solve the above technical problems in view of the defects of the prior art that the overall anti-interference robustness of current measurement and judgment in the batch detection of AC withstand voltage of disc insulators is relatively low and the control level of result consistency in parallel stations is limited.

[0007] To achieve the above purpose, the present invention provides the following technical solutions: In the first aspect, the present application provides a multi-channel leakage current detection method for AC withstand voltage of disc insulators, including: Setting a parameter set and allocating a version identifier, where the parameter set includes AC withstand voltage, AC frequency, voltage boosting strategy, voltage stabilizing strategy, sampling parameters, judgment threshold, and consistency threshold; Establish equipotential boundaries and equalizing electrodes at the high voltage application location. Connect the high voltage end of each disc insulator under test to the equipotential boundary, and connect the low voltage end to the corresponding independent measurement circuit and return to the common grounding reference point. The voltage is boosted according to the boost strategy and stabilized according to the stabilization strategy. During the boost and stabilization periods, each independent measurement circuit is sampled simultaneously to obtain a multi-channel discrete sampling sequence. Anti-aliasing filtering and windowing are performed on the multi-channel discrete sampling sequence to obtain the effective value of leakage current and stability index of each window; Establish calibration models for each channel and calibrate and compensate for window results; calculate channel consistency indices and compare them with consistency thresholds. Based on the judgment threshold, the effective value of leakage current, stability index, channel consistency index, grounding continuity status and communication health status, the channel judgment result and abnormal event flag are output. When the grounding continuity status or communication health status is not met or the abnormal event flag meets the triggering conditions, the voltage is reduced or disconnected, and the channel judgment result, abnormal event flag and version identifier are written into the structured record.

[0008] By adopting the above technical solution, through parameter set versioning, AC withstand voltage electric field boundary control, multi-channel synchronous sampling and windowed measurement, channel calibration compensation and consistency constraints, and incorporating grounding and communication status into interlocking judgment, comparable acquisition and reliable judgment of multi-channel leakage current can be achieved in the scenario of batch testing of AC withstand voltage for disc insulators. This can improve the robustness of the discrimination criteria under strong electromagnetic environment and improve the consistency control level of parallel station results, thus meeting the requirements of high robustness of current measurement judgment and controllable consistency of parallel station results in batch testing of AC withstand voltage for disc insulators.

[0009] Among these features, parameter sets and version identifiers provide clear traceability and comparison benchmarks for the test configuration; equipotential boundaries and equalizing electrodes make the electric field conditions in the pressure application area more consistent and reduce the impact of random disturbances on the measurement; synchronous sampling and anti-aliasing filtering combined with window division transform the leakage current characterization from instantaneous readings to time window statistics and enhance cross-window comparability; calibration models and compensation processing quantify and correct channel gain and bias differences and provide a unified scale for consistency indicators; consistency threshold constraints ensure that multi-channel results remain convergent under the same judgment scale; and the comprehensive threshold judgment and stability indicators, combined with grounding continuity status and communication health status, make the identification of abnormal events more credible; and the combination of voltage reduction or disconnection and structured record writing provides a traceable chain of evidence for the test process and judgment conclusions.

[0010] Preferably, the steps of setting the parameter set and assigning version identifiers include: Receives and writes the parameter inputs corresponding to AC withstand voltage, AC frequency, boost strategy, voltage regulation strategy, sampling parameters, judgment threshold and consistency threshold into the parameter set; Perform field integrity checks and field consistency checks on the parameter set. When the field integrity checks and field consistency checks meet the conditions, perform a digest calculation on the parameter set and assign the digest calculation result as a version identifier. When a field integrity check or field consistency check fails to meet the conditions, output a parameter exception event flag and write the parameter exception event flag to the structured record.

[0011] By adopting the above technical solution, the version identifier is formed by combining field integrity and consistency verification with digest calculation, which realizes the standardization and version solidification of experimental parameter input, improves the consistency of configuration and the comparability of reproducible experiments, and reduces the impact of parameter drift on the stability of judgment.

[0012] Preferably, the step of establishing an equipotential boundary and equalizing electrodes at the high voltage application location includes: An equipotential boundary is arranged at the location where high voltage is applied, and the electrical connection of the equipotential boundary is closed. A voltage equalization electrode is arranged outside the equipotential boundary, and the voltage equalization electrode is electrically connected to the equipotential boundary. Before boosting the voltage, potential consistency detection is performed on different sampling points at the equipotential boundary and the potential consistency status is output. Surface continuity detection is performed on the equalizing electrode and the surface qualification status is output. When the potential consistency state or surface qualification state does not meet the preset conditions, an abnormal electric field condition event flag is output and written into the structured record.

[0013] By adopting the above technical solution, using equipotential boundary closed connection and combined with external coupling of equalizing electrodes, and introducing potential consistency detection and surface continuity detection, the electric field conditions before pressurization can be verified and confirmed, which can improve the consistency of electric field in the pressurized area and improve the repeatability of current measurement results.

[0014] Preferably, the steps of boosting voltage according to a boost strategy and stabilizing voltage according to a stabilization strategy, and simultaneously sampling each independent measurement loop during the boost and stabilization periods to obtain a multi-channel discrete sampling sequence include: Read the boost and regulation strategies and generate boost and regulation control sequences, execute boost according to the boost control sequence and regulate according to the regulation control sequence; A shared sampling time base is established and a synchronization trigger signal is generated during the boost and stabilization phases. When the synchronization trigger signal arrives, sampling is initiated for each independent measurement loop and the sampling data is output. Each independent measurement loop is assigned a channel identifier, and the sampled data is assigned a window number and a timestamp. Based on the channel identifier, window number, and timestamp, a multi-channel discrete sampling sequence is assembled and written into a structured record.

[0015] By adopting the above technical solution, combining boost and stabilization control sequences and generating synchronous triggers with the help of shared sampling time base, and assigning channel identifiers, window numbers and timestamps to the data, the time alignment of multi-channel sampling and the standardization of data organization can be achieved, which can improve the accuracy of cross-channel comparison and enhance the certainty of abnormal event location.

[0016] Preferably, the steps of performing anti-aliasing filtering and windowing on the multi-channel discrete sampling sequence to obtain the effective value of leakage current and stability index of each window include: Perform anti-aliasing filtering on the multi-channel discrete sampling sequence according to the channel identifier and output the filtered sequence. Perform window division on each filtered sequence according to the window number and output the window sequence. The effective value of leakage current for each window is calculated based on the window sequence, and an effective value sequence is generated. The mean and standard deviation of the effective value sequence are calculated within the continuous window range, and the coefficient of variation is generated as a stability index and written into the structured record.

[0017] By adopting the above technical solution, anti-aliasing filtering is performed on a channel basis and the effective value of leakage current is calculated using windowing. Then, the coefficient of variation is obtained by combining the mean and standard deviation of the continuous window. This achieves both amplitude and fluctuation characterization of leakage current, which can improve the stability characterization ability and resistance to random disturbances of the discrimination criteria.

[0018] Preferably, the steps of establishing a calibration model for each channel, calibrating and compensating for the window results, calculating the channel consistency index, and comparing it with the consistency threshold include: Before boosting, a calibration process is performed on each independent measurement loop and a calibration sampling sequence is generated. A calibration model is then established for each channel based on the calibration sampling sequence. Based on the calibration model, the effective value of leakage current in each window is calibrated and compensated, and a sequence of calibrated effective values ​​is generated. Based on the sequence of calibrated effective values, the channel consistency index is calculated and compared with the consistency threshold. If the consistency conditions are not met, a consistency anomaly event flag is output and written into the structured record.

[0019] By adopting the above technical solution, a calibration sampling sequence is generated and a channel calibration model is established through a pre-boost calibration process. After compensating the effective value of the window, the consistency index is calculated and compared with the consistency threshold. This achieves channel scale unification and consistency quantification constraints, which can improve the comparability of parallel station results and enhance the consistency control level of batch judgment.

[0020] Preferably, based on the judgment threshold, the effective value of leakage current, stability index, channel consistency index, grounding continuity status, and communication health status, the channel judgment result and abnormal event flag are output. When the grounding continuity status or communication health status is not met, or the abnormal event flag meets the triggering conditions, the following steps are performed: The communication health status is obtained based on the transmission statistics of multi-channel discrete sampling sequences through the communication link. The channel determination result is generated based on the comparison results of the effective value of leakage current, stability index, channel consistency index and determination threshold. Interlocking states are generated based on grounding continuity and communication health status. When the interlocking state does not meet the interlocking conditions or the abnormal event flag meets the triggering conditions, a step-down control command or a cut-off control command is generated and executed. Abnormal event flags include parameter abnormal event flags, electric field condition abnormal event flags, consistency abnormal event flags, and recording abnormal event flags.

[0021] By adopting the above technical solution, a communication health status is formed based on transmission statistics and an interlocking status is generated together with the grounding continuity status. At the same time, the comparison results of effective values, stability indicators and consistency indicators are aggregated into channel judgment results, realizing a collaborative closed loop between the judgment basis and the safety status, which can improve the reliability of abnormal event handling and the safety certainty of the test process.

[0022] Preferably, the step of writing the channel determination result, abnormal event marker, and version identifier into the structured record includes: Write the channel determination result, abnormal event marker, and version identifier into a structured record, and assign a record number to this structured record; A record summary is generated based on the structured record, and the record summary is combined with the record summary of the previous structured record to obtain a combined summary; Perform hash calculation on the combined digest to obtain a chain digest, write the chain digest into the structured record and output the record consistency status. When the record consistency status does not meet the preset record consistency conditions, output the record exception event flag and perform decompression or cut-off.

[0023] By adopting the above technical solution, a combined digest is generated using the record sequence number and the record digest, and a hash calculation is performed to obtain a chain digest which is written into the structured record. This achieves consistency verification and traceability constraints of the record chain, which can improve data credibility and audit verifiability and enhance the evidence stability of batch detection conclusions.

[0024] Secondly, this application also provides a multi-channel AC withstand voltage leakage current detection system for disc insulators, comprising: The parameter unit is used to set the parameter set and assign a version identifier. The parameter set includes AC withstand voltage, AC frequency, boost strategy, voltage regulation strategy, sampling parameters, judgment threshold and consistency threshold. Boundary elements are used to establish equipotential boundaries and equalizing electrodes at the high voltage application location, and to connect the high voltage end of each disc insulator under test to the equipotential boundary. The sampling unit is used to connect the low-voltage end of each disc insulator under test to the corresponding independent measurement circuit and return to the common grounding reference point. It boosts the voltage according to the boosting strategy and stabilizes the voltage according to the stabilizing strategy. During the boosting and stabilizing, it generates a synchronous trigger signal based on the shared sampling time base and synchronously samples each independent measurement circuit to obtain a multi-channel discrete sampling sequence. The metering unit is used to perform anti-aliasing filtering and window division on the multi-channel discrete sampling sequence to obtain the effective value of leakage current and stability index of each window; The calibration unit is used to establish a calibration model for each channel and calibrate and compensate for the window results, calculate the channel consistency index and compare it with the consistency threshold. The interlocking unit is used to output channel judgment results and abnormal event flags based on the judgment threshold, effective value of leakage current, stability index, channel consistency index, grounding continuity status, and communication health status, and to perform voltage reduction or disconnection when the grounding continuity status or communication health status is not met or the abnormal event flag meets the triggering conditions. The evidence storage unit is used to write the channel determination result, abnormal event marker, and version identifier into a structured record.

[0025] Preferably, the evidence storage unit is also used to generate a record digest based on the structured record and combine it with the record digest of the previous structured record to obtain a combined digest, perform hash calculation on the combined digest to obtain a chain digest, write the chain digest into the structured record and output the record consistency status, and when the record consistency status does not meet the preset record consistency conditions, the interlocking unit outputs a record abnormal event flag and performs voltage reduction or cutoff.

[0026] As can be seen from the above technical solutions, the present invention has the following advantages: This application provides a method and system for detecting multi-channel leakage current in disc insulators under AC withstand voltage. By versioning parameter sets, controlling the AC withstand voltage electric field boundary, implementing multi-channel synchronous sampling and windowed measurement, channel calibration compensation and consistency constraints, and incorporating grounding and communication status into interlocking judgment, it achieves comparable acquisition and reliable judgment of multi-channel leakage current in the scenario of batch testing of AC withstand voltage for disc insulators. It can improve the robustness of the discrimination criteria under strong electromagnetic environment and improve the consistency control level of parallel station results, meeting the requirements of high robustness of current measurement judgment and controllable consistency of parallel station results in batch testing of AC withstand voltage for disc insulators. Attached Figure Description

[0027] To more clearly illustrate the technical solution of the present invention, the accompanying drawings used in the description will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is a flowchart of a multi-channel AC withstand voltage leakage current detection method for disc insulators provided by the present invention; Figure 2 This is a schematic diagram of a multi-channel leakage current detection system for AC withstand voltage of disc insulators provided by the present invention.

[0029] Among them, 1. Parameter unit, 2. Boundary unit, 3. Sampling unit, 4. Measurement unit, 5. Calibration unit, 6. Interlocking unit, and 7. Evidence storage unit. Detailed Implementation

[0030] Various embodiments of this disclosure are described more fully below with reference to the accompanying drawings. This disclosure may have various embodiments, and adjustments and changes may be made therein. However, it should be understood that there is no intention to limit the various embodiments of this disclosure to the specific embodiments disclosed herein, but rather this disclosure should be understood to cover all adjustments, equivalents, and / or alternatives falling within the spirit and scope of the various embodiments of this disclosure.

[0031] In the following, the terms “comprising” or “may include”, which may be used in various embodiments of this disclosure, indicate the presence of the disclosed functions, operations, or elements, and do not limit the addition of one or more functions, operations, or elements. Furthermore, as used in various embodiments of this disclosure, the terms “comprising,” “having,” and their cognates are intended only to indicate a particular feature, number, step, operation, element, component, or combination of the foregoing, and should not be construed as primarily excluding the presence of one or more other features, numbers, steps, operations, elements, components, or combinations of the foregoing, or the possibility of adding one or more combinations of the foregoing.

[0032] It should be noted in advance that, in order to facilitate a clear and accurate description of the technical solutions in the embodiments of this application, the following is a brief explanation of some terms and related technologies involved in the embodiments of this application: 1. Effective value of leakage current: Usually defined as RMS (Root Mean Square), it is used to characterize the equivalent amplitude of AC current within a cycle or a given time window. Its calculation is based on the square root of the average square of the sampling points, and it is more suitable than the instantaneous value for amplitude evaluation and threshold determination in AC withstand voltage process.

[0033] 2. Anti-aliasing filtering: A commonly used band-limiting processing technique before and after discrete sampling of analog signals. By suppressing more than half of the high-frequency components at the sampling frequency, it avoids high-frequency components from folding to low frequencies after sampling and forming aliasing interference, thereby improving the authenticity and comparability of the discrete sampling sequence in representing the current components of the target frequency band.

[0034] 3. Hash Calculation and Chain Digest: Hash is a calculation method that maps data of arbitrary length to a fixed-length digest. Chain digest is a digest obtained by combining the digest of the current record with the digest of the previous record and then hashing it, so that records form a chain of verification links, which facilitates the verification of the integrity and consistency of records.

[0035] To address the issues of large fluctuations in multi-channel current measurement results, weak comparability of parallel workstations, and weak robustness of judgment criteria during batch testing of AC withstand voltage disc insulators under strong electromagnetic environments and complex electric fields, which result in limited consistency control of batch judgments, this application discloses a multi-channel leakage current detection method and system for AC withstand voltage disc insulators. This method addresses these problems, which hinder operations and quality inspection processes from meeting the practical needs for rapid multi-station judgment, consistent and controllable results, and process traceability. By introducing versioned parameter set management, controlled electric field boundary organization, and a multi-channel synchronous sampling and measurement mechanism, combined with channel calibration compensation and consistency constraints, as well as interlocking judgment and structured recording, the method achieves reliable characterization and consistent judgment of leakage current during AC withstand voltage testing. This improves the robustness of current measurement and judgment under strong interference conditions and enhances the consistency control level of parallel workstation results, further strengthening the safety certainty of abnormal event handling and the verifiability of test conclusions.

[0036] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0037] like Figure 1 As shown in this embodiment, a multi-channel AC withstand voltage leakage current detection method for disc insulators is provided, comprising: Step S1: Set the parameter set and assign a version identifier. The parameter set includes AC withstand voltage, AC frequency, boost strategy, voltage regulation strategy, sampling parameters, judgment threshold and consistency threshold. Step S2: Establish an equipotential boundary and equalizing electrodes at the high voltage application location. Connect the high voltage end of each disc insulator under test to the equipotential boundary, and connect the low voltage end to the corresponding independent measurement circuit and return it to the common grounding reference point. Step S3: Boost the voltage according to the boost strategy and stabilize the voltage according to the stabilization strategy. During the boost and stabilization periods, sample each independent measurement circuit simultaneously to obtain a multi-channel discrete sampling sequence. Step S4: Perform anti-aliasing filtering and window division on the multi-channel discrete sampling sequence to obtain the effective value of leakage current and stability index of each window; Step S5: Establish a calibration model for each channel and calibrate and compensate for the window results, calculate the channel consistency index and compare it with the consistency threshold; Step S6: Based on the judgment threshold, effective value of leakage current, stability index, channel consistency index, grounding continuity status and communication health status, output channel judgment result and abnormal event flag. When the grounding continuity status or communication health status is not satisfied or the abnormal event flag meets the triggering conditions, perform voltage reduction or disconnection, and write the channel judgment result, abnormal event flag and version identifier into the structured record.

[0038] This embodiment employs a parameter set versioning management and summary solidification mechanism to ensure that key configurations such as AC withstand voltage, frequency, boost and stabilization strategies, sampling, and judgment thresholds have consistent and traceable version benchmarks, thus providing a stable reference for cross-batch verification and result comparison in batch testing. By organizing equipotential boundaries and configuring equalizing electrodes at the high-voltage application location, the electric field conditions in the pressure application area are made more consistent, and the influence of random disturbances on leakage current characterization is suppressed, balancing current measurement stability and inter-station comparability in strong electromagnetic environments. By establishing a shared sampling time base and performing multi-channel synchronous sampling during boost and stabilization, combined with anti-aliasing filtering and windowed measurement, the leakage current is transformed from an instantaneous reading into a windowed statistic and introduced into a stability characterization, thereby improving discrimination. Based on robustness and the ability to distinguish abnormal fluctuations; by calibrating each channel and compensating for window results before the test, and by using consistency indicators to constrain the convergence of parallel channels, the channel scale differences are quantitatively controlled and the consistency control level of batch judgment is improved; by incorporating leakage current measurement results, grounding continuity status, and communication health status into the interlocking judgment logic, and performing voltage reduction or disconnection when the trigger conditions are met, the handling of abnormal events has higher safety certainty and reduces the cost of repeated tests caused by misjudgment; at the same time, by writing the judgment results, abnormal events, and version identifiers into structured records, the detection process and conclusions form a verifiable chain of evidence, improving the traceability and audit availability in operation and maintenance and quality inspection scenarios.

[0039] It should be noted in advance that, in the embodiments of this application, a method for detecting multi-channel leakage current of disc insulators under AC withstand voltage is operated on an AC withstand voltage test device. The device consists of a multi-station withstand voltage support, an electric rotary transposition mechanism, an AC high voltage application and electric field boundary control component, a multi-channel leakage current acquisition and metering module, a wireless communication link, a control terminal and recording and evidence storage unit, and a safety interlocking link. It is used to apply pressure to multiple disc insulators in parallel under AC withstand voltage strong electromagnetic environment and simultaneously acquire leakage current data at each station, so as to realize batch testing and fault location.

[0040] In terms of structural load-bearing capacity, the multi-station withstand voltage support adopts a double-layer arrangement to integrate multiple independent testing stations in a limited space. Each station is equipped with an independent insulation branch and electrode assembly, which can support the simultaneous application of AC withstand voltage to multiple insulators. The insulators are repositioned and positioned through an electric rotation system. The rotation speed is adjustable and supports remote control operation, so that the installation and repositioning process is completed in a fixed position, reducing the operational complexity and risks caused by personnel moving around the device.

[0041] In terms of AC high voltage application and electric field boundary control, the high voltage application end is equipped with an equipotential boundary and equalizing electrode assembly. The equalizing cover adopts an integrally machined circular structure and is reliably connected to the test electrode to form an equipotential body. The electric field distribution is optimized through a smooth continuous curved surface and a sufficient radius of curvature, which suppresses the interference caused by phenomena such as corona and partial discharge caused by the concentration of edge field strength on the leakage current determination, making the electric field conditions of the parallel station more consistent and closer to the actual operating conditions.

[0042] In terms of grounding and safety bearing capacity, each workstation is equipped with an automatic grounding spring device that is linked to the workstation's operation. When the insulator is placed in position, its own weight triggers the spring to contract, thereby automatically engaging and connecting the grounding electrode. After the test is completed, the spring resets as the workstation is lifted, thereby automatically disconnecting the grounding circuit. This forms an automatic grounding process that matches the electric rotation and transposition, while also providing a foundation for grounding continuity for subsequent interlocking determination, thereby reducing the risk of discharge and personnel contact during high-voltage testing.

[0043] In terms of leakage current acquisition, measurement, and communication, each workstation is equipped with an independent leakage current test module. The module uses a sampling resistor to convert a small current into a measurable voltage signal. Combined with a filtering circuit, it completes noise reduction and anti-interference conditioning. Then, it is converted from analog to digital to obtain a digital quantity, realizing multi-channel parallel measurement and reducing crosstalk and common-mode coupling between channels. Multiple workstation data are reported to the control terminal through a short-range radio frequency wireless link. The wireless frame can combine address, sequence number, CRC check and time slot scheduling mechanism to improve the transmission reliability under high voltage and strong electromagnetic environment and reduce the risk of misjudgment caused by bit errors and packet loss.

[0044] In terms of control and record storage, the control terminal is used to receive and display leakage current data of each workstation and compare it with the threshold to complete the judgment and fault location. It also combines communication link quality statistics to form communication health-related status quantities, and further forms a logical interlock with the pressure allowable conditions such as grounding continuity, emergency stop link, and legality of test parameters. If any condition fails, it enters the failure safety state and triggers voltage reduction or disconnection. At the same time, test parameters, threshold version, channel calibration coefficient, communication quality and event logs are written into the record chain to support retesting, comparison and engineering traceability.

[0045] Hereinafter, steps S1 to S6 will be specifically described according to embodiments of this application.

[0046] In step S1, the core task is to form a verifiable unified input of the key process parameters, measurement parameters and judgment parameters of the AC withstand voltage test before the test begins, and output a traceable version identifier to constrain the consistent reference of the same set of parameters in subsequent voltage boosting, sampling, measurement, judgment and evidence storage.

[0047] Specifically, a parameter set can be set and a version identifier can be assigned; in this embodiment, the parameter set includes AC withstand voltage, AC frequency, boost strategy, voltage regulation strategy, sampling parameters, judgment threshold, and consistency threshold. The effective value of the AC withstand voltage is adopted... Characterization, unit is The AC frequency adopts Characterization, unit is The boost strategy is used to determine at least the boost time, slope, and stage switching conditions. The boost time is adopted using... Characterization, unit is The voltage stabilization strategy is used at least to determine the stabilization duration and steady-state criteria. The stabilization time adopts... Characterization, unit is The sampling parameters should include at least the sampling frequency, the number of window points, and the filter cutoff frequency. The sampling frequency should use... Characterization, unit is The window points are represented by the window points. Characterization, the filter cutoff frequency is adopted Characterization, unit is The threshold for judgment includes at least the leakage current threshold and the sudden change threshold. The leakage current threshold is determined using... Characterization, unit is The mutation threshold is adopted. Characterization, unit is The consistency threshold is used to constrain the upper limit of deviation or statistical deviation of multi-channel results, and adopts... Characterization. In the embodiments of this application, the input of the parameter set can come from local interactive input, a preset process library, or an external distribution interface, and can be directly stored in the library during the receiving stage for subsequent structured record reference.

[0048] In some embodiments of this application, parameter inputs corresponding to AC withstand voltage, AC frequency, boost strategy, voltage regulation strategy, sampling parameters, judgment threshold, and consistency threshold can be received and written into a parameter set. Furthermore, to ensure traceability and tamper-proof correlation of the parameter set, field integrity checks and field consistency checks can be performed on the parameter set. When the field integrity checks and field consistency checks meet the conditions, a digest calculation is performed on the parameter set, and the digest calculation result is assigned as a version identifier. The version identifier can be a hash digest string or a fixed-length binary digest, and the digest input must at least contain the effective value of the AC withstand voltage. AC frequency Boost time stabilization time Sampling frequency Window points Cutoff frequency Leakage current threshold Mutation threshold and consistency threshold Fields such as these make the version identifier sensitive to changes in key process specifications. For example, one could take... , , , , , , , , When a field integrity check or field consistency check fails, a parameter exception event flag is output and written to the structured record.

[0049] Thus, step S1, by aggregating and versioning the test process parameters and metrological criteria parameters, constitutes a parameter governance system that drives boosting, sampling, and judgment with a unified standard, providing verifiable input boundaries and traceable version anchors for subsequent processes.

[0050] In step S2, the core task is to construct controlled electric field boundary conditions at the high-voltage application end and organize multi-station electrical connections so that the high-voltage end of each tested disc insulator is under equipotential boundary, while each low-voltage end enters an isolated independent measurement circuit and returns to the common grounding reference point, thereby reducing inter-station coupling and suppressing spurious current surges caused by edge field strength concentration.

[0051] Specifically, an equipotential boundary and equalizing electrode can be established at the high voltage application location. The equipotential boundary can be formed by a conductive equalizing shield or a conductive equalizing ring. The equalizing electrode can adopt a smooth continuous curved surface structure to obtain a large radius of curvature and reduce local field concentration. In the embodiments of this application, a multi-station withstand voltage structure can be arranged in a limited space, such as an arrangement of several stations in upper and lower double layers. The circular equalizing shield is integrated into the high voltage application end to improve the electric field distribution and make the multiple stations under more uniform electric field conditions.

[0052] In some embodiments of this application, to ensure electrical connection closure and effective potential boundary, an equipotential boundary can be further arranged at the high-voltage application location, and the electrical connection of the equipotential boundary can be closed. An equalizing structure can be arranged outside the equipotential boundary to suppress edge effects; that is, equalizing electrodes can be arranged outside the equipotential boundary, and the equalizing electrodes can be electrically connected to the equipotential boundary. Subsequently, the test object is wired according to its work station, thereby connecting the high-voltage end of each test disc insulator to the equipotential boundary and connecting the low-voltage end to the corresponding independent measurement circuit and returning to the common grounding reference point. The common grounding reference point is the withstand voltage test grounding busbar or an equivalent common grounding point. The independent measurement circuit can be equipped with an independent sampling resistor and front-end conditioning link at each work station, maintaining circuit routing isolation to suppress common-mode coupling and crosstalk.

[0053] Furthermore, to verify the electric field and connection conditions before pressurization, multiple points of the equipotential boundary can be sampled and the surface condition of the equalizing electrode can be checked. In this embodiment, potential consistency detection can be performed on different sampling points of the equipotential boundary before voltage increase, and the potential consistency status can be output. Surface continuity detection can also be performed on the equalizing electrode, and the surface qualification status can be output. Potential consistency detection can acquire potential readings from multiple sampling points using a contact potential probe or a non-contact potential sensor, and compare them with allowable deviations to output the potential consistency status. Surface continuity detection can combine visual inspection with surface resistance testing to confirm that the equalizing electrode surface has no sharp points, burrs, or areas of discontinuity disruption, thereby reducing the risk of corona and partial discharge. When the potential consistency status or surface qualification status does not meet preset conditions, an abnormal electric field condition event flag is output and written into a structured record.

[0054] Thus, step S2, through the coordinated organization of the electric field and wiring of "equipotential boundary - equalizing electrode - independent loop - common reference", forms a reproducible multi-station controlled electric field and low-coupling current measurement foundation, providing a stable electric field boundary and loop topology prerequisite for subsequent boost sampling.

[0055] In step S3, the core task is to generate an executable high-voltage control sequence based on the boost and stabilization strategies, and to establish a shared sampling time base during the boost and stabilization stages to achieve multi-channel synchronous sampling, thereby ensuring that multiple workstations are comparable under the same time base and the same window division and supporting the time alignment capture of abrupt events.

[0056] Specifically, the voltage can be boosted according to the boost strategy and stabilized according to the stabilization strategy. During the boost and stabilization processes, multi-channel sampling is triggered simultaneously to form a multi-channel discrete sampling sequence. That is, during the boost and stabilization periods, each independent measurement circuit is sampled synchronously to obtain a multi-channel discrete sampling sequence.

[0057] In some embodiments of this application, to ensure that the boost and regulation processes can be reproduced by the control terminal, the boost and regulation strategies can be read from the parameter set and a control sequence can be generated to complete the execution closed loop. This can be achieved by reading the boost and regulation strategies and generating boost and regulation control sequences, and then further executing boost according to the boost control sequence and regulation according to the regulation control sequence. The boost control sequence can be a linear or piecewise linear voltage setting sequence, and the regulation control sequence can be a constant setting with an allowable fluctuation band. Furthermore, the effective value of the AC withstand voltage can be continuously monitored during the regulation phase. With frequency of communication Whether it is within the allowable deviation range is used to determine the steady-state condition.

[0058] Furthermore, multi-channel synchronous sampling relies on a shared sampling time base and a synchronization triggering mechanism. In this embodiment, a shared sampling time base can be established and a synchronization triggering signal can be generated during the boost and stabilization phases. When the synchronization triggering signal arrives, sampling is initiated for each independent measurement loop, and sampling data is output. For example, the shared sampling time base can be implemented by a unified sampling clock distribution or a unified synchronization frame trigger. The sampling data can be a discrete voltage sample sequence output by the analog front end of each channel or a discrete current sample sequence after local conversion. Furthermore, to support subsequent anti-aliasing processing, window measurement, and consistency verification, channels, windows, and time need to be labeled at the data level. In this embodiment, channel identifiers can be assigned to each independent measurement loop, and window numbers and timestamps can be assigned to the sampling data, thereby making the sampling data indexable in the structured record. At the same time, multi-channel discrete sampling sequences can be assembled according to the identification rules and written into the record, thereby assembling multi-channel discrete sampling sequences based on channel identifiers, window numbers, and timestamps and writing them into the structured record.

[0059] Thus, step S3, by serializing the boost and stabilization control and sharing the sampling time base, constitutes a three-in-one acquisition system of "controlled pressurization - synchronous sampling - indexable data," providing a consistent and aligned data foundation for subsequent digital metering and anomaly detection in a strong interference environment.

[0060] In step S4, the core task is to perform anti-aliasing filtering, window division, and robust measurement on the multi-channel discrete sampling sequence, output the effective value of leakage current for each window, and construct a stability index, thereby providing a calculable basis for over-limit judgment, breakdown judgment, and steady-state window selection.

[0061] Specifically, anti-aliasing filtering and windowing can be performed on the multi-channel discrete sampling sequence to obtain the effective value of leakage current and stability index of each window. In the embodiments of this application, the channel index is used. Indicates that the instantaneous value of leakage current for each channel is expressed as follows: Characterization, unit is Each channel is equipped with a sampling resistor to convert the leakage current into a voltage signal. The sampling resistor uses... Characterization, unit is The voltage across the sampling resistor is adopted Characterization, unit is The relationship between the two can be written as:

[0062] Based on this, differential amplification and anti-aliasing filtering are performed on the voltage across the sampling resistor, and the amplified analog signal is used. Characterization, channel equivalent gain is adopted. The representation can be written as:

[0063] Furthermore, cutoff frequency Used to limit the bandwidth of anti-aliasing low-pass filters to cover AC frequencies. Necessary harmonics and suppression of radio frequency and switching noise are achieved. When sampling to obtain a discrete sequence, the amplified analog signal is discretized into a discrete sampling sequence. The reconstructed current sequence is obtained by converting the channel gain and sampling resistance. It can be written as:

[0064] In some embodiments of this application, window partitioning is used to reconstruct the current sequence. Aggregate the samples into a window sequence based on a fixed number of points; for example, anti-aliasing filtering can be performed on multi-channel discrete sampling sequences according to channel identifiers and the filtered sequences can be output. Furthermore, windowing can be performed on each filtered sequence according to its window number and the window sequence can be output. (Regarding the window number...) The corresponding window can be used to calculate the effective value of the leakage current; in this embodiment of the application, the first... The reconstruction current sample value within each window is denoted as... And the effective value of the window leakage current is adopted Characterization, unit is It can be written as:

[0065] in, The current sequence length can be used to calculate the amplitude of abrupt changes to support breakdown event identification. The amplitude of the abrupt changes is then expressed as... Characterization, unit is It can be written as:

[0066] Furthermore, to quantify the steady-state degree of the window effective value sequence, a stability index can be calculated within a continuous window range. In this embodiment, the effective value of leakage current for each window can be calculated based on the window sequence to generate an effective value sequence. The mean and standard deviation of the effective value sequence can be calculated within a continuous window range to generate a coefficient of variation as a stability index, which is then written into a structured record. The coefficient of variation uses... Characterization, the mean function is adopted Characterization, the standard deviation function is used The representation can be written as:

[0067] in, and These represent the mean and standard deviation of the effective value of the window leakage current, respectively. For example, the sampling resistor can be taken as... Channel equivalent gain Sampling frequency Window points The window duration is During the voltage stabilization phase, the number of consecutive windows can be required. Satisfy coefficient of variation Not exceeding the stability threshold Then output the steady-state result to suppress misjudgment of transient fluctuations caused by strong disturbances.

[0068] Thus, step S4, through the digital metrology link of "anti-aliasing filtering - window partitioning - RMS measurement - stability constraint - mutation quantization", forms a robust metrology system for strong electromagnetic environments, providing reproducible window-level quantization input for subsequent calibration consistency and interlocking determination.

[0069] In step S5, the core task is to establish an implementable calibration model for each channel and perform calibration compensation on the window results. At the same time, a channel consistency index is constructed and compared with a consistency threshold to explicitly constrain the impact of channel-level device deviation, gain error and zero bias error on multi-station comparability within a controllable range.

[0070] Specifically, a calibration model can be established for each channel, and window results can be calibrated and compensated. Furthermore, channel consistency indices can be calculated and compared with a consistency threshold. In this embodiment, the calibration process for each independent measurement circuit can be completed before voltage boosting: multiple calibration point currents are injected into each independent measurement circuit using a standard AC current source, and after stabilization at each calibration point, the effective values ​​of window leakage currents for multiple windows are collected. To form a calibration sampling sequence.

[0071] In some embodiments of this application, a calibration process can be performed on each independent measurement loop before boosting to generate a calibration sampling sequence, and a calibration model can be further established for each channel based on the calibration sampling sequence. The calibration model can be linear or piecewise linear; in linear calibration, the original measured values ​​are used... Characterization, using calibrated measurements Characterization can be achieved using a proportionality coefficient. With bias term Establish a calibration relationship and prioritize the use of calibrated measurement values ​​when determining and displaying data on the control terminal. At the same time, the original measurement values ​​are retained. For use in verification and traceability.

[0072] Furthermore, calibration compensation is performed at the window level to ensure consistency with subsequent judgment criteria. In this embodiment, calibration compensation can be performed on the effective leakage current value of each window based on the calibration model to generate a sequence of effective calibration values. The channel consistency index is used to measure the deviation level of parallel channels under the same excitation condition and can be calculated at calibration points or steady-state window sets. In this embodiment, the deviation of each channel at each calibration point can be defined as the original measurement value of each channel. The difference between the channel mean and the mean, and the maximum deviation and root mean square deviation are calculated as components of the channel consistency index. Simultaneously, the channel consistency index is compared with the consistency threshold. The system compares the channel consistency index based on the calibration effective value sequence with a consistency threshold. When the comparison fails to meet the consistency criteria, an event can be output and written to a record to drive maintenance or recalibration; that is, when the comparison fails to meet the consistency criteria, a consistency anomaly event flag is output and written to a structured record. For example, the calibration point current set can be set as follows: It also requires that the maximum deviation and the root mean square deviation do not exceed a preset consistency threshold. Only then is the pressurization process allowed.

[0073] Thus, step S5, through the closed-loop mechanism of "pre-pressurization calibration - window-level compensation - consistency quantification - threshold constraint - anomaly evidence storage", constitutes a multi-channel comparability error management system, providing a consistent and traceable metrological input basis for subsequent interlock determination.

[0074] In step S6, the core task is to integrate the judgment threshold, the effective value of the window leakage current, the stability index, the channel consistency index, and the safety-related state variables, output the channel judgment result and the abnormal event marker, and perform voltage reduction or disconnection when the interlocking conditions are not met or abnormal triggering occurs. At the same time, the test conclusions, events and version identifiers are written into the structured record and a chain consistency verification is formed to achieve failure safety and verifiable traceability.

[0075] Specifically, the system can output channel determination results and abnormal event markers based on a determination threshold, the effective value of leakage current, stability indicators, channel consistency indicators, grounding continuity status, and communication health status. The determination threshold is used to determine the effective value of the leakage current within the window. Mutation amplitude Coefficient of variation And perform threshold comparisons using channel consistency indicators; when the effective value of window leakage current... Exceeding the leakage current threshold The corresponding channel can be determined to be unqualified when the sudden change amplitude is large. Exceeding the mutation threshold When cross-range saturation characteristics appear, a breakdown event can be identified and rapid response can be triggered. To enhance the ability to characterize the insulation degradation mechanism, a fundamental phase reference can be introduced within the steady-state window set, and the reconstructed current sequence can be... Performing in-phase and quadrature projections yields in-phase and quadrature components, and the change in the in-phase component serves as supplementary evidence of an increase in the resistive component; in this embodiment, the current sequence can be reconstructed within the steady-state window. Calculate in-phase components Orthogonal components This allows the classification criteria of "health-early warning-non-compliance-breakdown" and the triggering reasons to be output to the abnormal event marker and saved in the structured record for review.

[0076] It should be noted that the reliability of the communication link directly affects the integrity of the multi-channel discrete sampling sequence and the reliability of the judgment. In some embodiments of this application, the communication health status can be obtained based on the transmission statistics of the multi-channel discrete sampling sequence through the communication link. The communication health status can be obtained by comprehensively considering the packet loss rate, CRC check failure rate, duplicate frame ratio, and received signal strength statistics, and compared with a preset threshold to output whether the communication health status meets the conditions. Meanwhile, the channel judgment result needs to be generated by comparing the measurement results with the threshold. In this embodiment, the channel judgment result can be generated based on the comparison results of the effective value of leakage current, stability index, and channel consistency index with the judgment threshold, wherein the stability index uses the coefficient of variation. Characterize and require the number of consecutive windows Steady-state judgment results are only allowed to be output after the stability threshold is met. Safety interlocking relies on a combination of state variables such as grounding continuity and communication health. Furthermore, interlocking states can be generated based on grounding continuity and communication health states. The grounding continuity state can be obtained by detecting the grounding resistance and contact status from the common grounding reference point to the grounding points of each workstation, and compared with the allowable upper limit to output whether the grounding continuity condition is met.

[0077] Based on this, a voltage reduction or disconnection must be executed immediately upon interlocking triggering. In this embodiment, a voltage reduction control command or a disconnection control command is generated and executed when the interlocking state does not meet the interlocking conditions or when the abnormal event flag meets the triggering conditions. The abnormal event flag is used to categorize the triggering cause and support subsequent tracing. In this embodiment, the abnormal event flag includes parameter abnormal event flags, electric field condition abnormal event flags, consistency abnormal event flags, and record abnormal event flags, and can carry the triggering channel index, triggering window number, and the effective value of the window leakage current at the time of triggering in the structured record. With the magnitude of mutation Key evidence fields, etc.

[0078] It should be further explained that the test conclusions need to be stored in a structured manner and have a verifiable consistency check chain. In this embodiment, the channel judgment result, abnormal event marker, and version identifier can be written into a structured record, and an incrementing record number can be assigned to the record during writing to ensure traceability of the order, that is, a record number can be assigned to this structured record. At the same time, a record digest can be generated for the structured record, and a chain digest can be obtained by hashing it with the record digest of the previous record to achieve cross-record tampering detectable consistency check. In this embodiment, a record digest can be generated based on the structured record, and the record digest can be further combined with the record digest of the previous structured record to obtain a combined digest. Then, a hash calculation is performed on the combined digest to obtain a chain digest and it is written into the structured record, thereby forming a digest chain linked by record number. The control terminal can output the record consistency status according to the chain digest, and output an event and perform interlocking processing when the consistency condition is not met. In this embodiment, a chain digest can be written into the structured record and the record consistency status can be output. When the record consistency status does not meet the preset record consistency condition, a record abnormal event marker is output and voltage reduction or disconnection is performed.

[0079] Thus, step S6 closes the loop of "measuring judgment - communication and grounding safety status - interlocking handling - structured evidence storage - chain consistency verification", forming a comprehensive technical system that takes into account the robustness of judgment, the certainty of handling and the verifiability of conclusions, providing traceable, verifiable output results with failure safety boundaries for batch AC withstand voltage testing.

[0080] In summary, this method constructs equipotential boundaries and equalizing electrodes at the high-voltage application location, along with synchronous sampling using multi-channel independent measurement circuits. It combines anti-aliasing filtering and windowed effective value measurement to form a robust AC leakage current characterization. Simultaneously, it introduces channel calibration compensation and consistency constraints, and links the grounding continuity status and communication health status for safety interlocking. This enables batch parallel, comparable, and traceable testing of disc insulators in strong electromagnetic environments. It can significantly reduce the risk of false spikes and misjudgments caused by corona and partial discharge, improve the comparability and judgment stability between channels, and rapidly reduce voltage or disconnect during abnormal triggering to enhance test safety. In this way, it enhances detection efficiency, data reliability, and result verifiability.

[0081] It should be noted that, although the embodiments in this application are based on... Figure 1 Steps S1 to S6 are described sequentially, but this does not mean that steps S1 to S6 must be performed in a strict order. The reason this embodiment follows this order is... Figure 1 The order in which steps S1 to S6 are described is provided to facilitate understanding of the technical solutions of the embodiments of this application by those skilled in the art. In other words, in the embodiments of this application, the order of steps S1 to S6 can be appropriately adjusted according to actual needs.

[0082] In some embodiments of this application, the method is applied to the batch testing of power frequency AC withstand voltage of disc suspension insulators. The testing device adopts a double-layer withstand voltage structure with a total of 16 stations. Each station corresponds to an independent measurement circuit and communicates with the control console through a short-range radio frequency link. During the test, the common grounding reference point is used as a unified zero potential reference. The electric field at the high-voltage end is constrained by the equipotential boundary and the equalizing electrode, thereby completing a complete implementation process from clamping, calibration, voltage boosting, voltage stabilization, synchronous sampling, metrological judgment, interlocking processing to structured evidence storage.

[0083] The complete implementation process may include the following steps: Step one: Complete the test environment and equipment status check and establish a common ground reference point. Specifically, control the ambient temperature of the test area at... to Within the range and confirm that the altitude does not exceed The grounding resistance of the common grounding reference point is measured to obtain the grounding continuity status. Among them, the grounding continuity state It is used to indicate whether the electrical connection between the common grounding reference point and the return path of each workstation circuit meets the allowable conditions, and at the same time to verify the continuity of the emergency stop link and the disconnection circuit to ensure that subsequent interlocking procedures can be executed.

[0084] Step two: Input test parameters and generate a version identifier. Specifically, input the effective value of the AC withstand voltage. Set as , will the frequency of the exchange Set as , will boost time Set as , stabilization time Set as sampling frequency Set as , window points Set as cutoff frequency Set as Leakage current threshold Set as , mutation threshold Set as , set the consistency threshold Set as Subsequently, integrity and consistency checks are performed on the parameter fields, and a digest calculation is performed on the parameter set to obtain the version identifier. Version identifier Used to anchor the parameter caliber and judgment caliber of this experiment in subsequent structured records.

[0085] Step 3: Establish equipotential boundaries and equalizing electrodes, and complete the site wiring and electric field condition verification. Specifically, equipotential boundaries are arranged at the high-voltage application locations and electrical connections are closed. Equalizing electrodes are placed outside the equipotential boundaries and electrically connected to them, ensuring a consistent potential boundary for the high-voltage terminals of the 16 sites. The high-voltage terminals of each tested disc insulator are connected to the equipotential boundaries, and the low-voltage terminals are connected to their respective independent measurement circuits and returned to the common grounding reference point. Before voltage increase, potential consistency testing is performed at different sampling points along the equipotential boundaries to obtain the potential consistency status. The surface continuity of the equalizing electrode was measured to obtain a qualified surface condition. When the potential is consistent Or surface qualified status Output electric field condition abnormal event flag when preset conditions are not met And it is prohibited to enter the pressurization process.

[0086] Step four: Perform multi-channel calibration and establish a channel calibration model. Specifically, for each channel index... The corresponding independent measurement loops are sequentially injected with the set of effective values ​​of the calibration current. The effective value of the window leakage current at each calibration point is collected and a calibration sampling sequence is formed; based on the calibration sampling sequence, each channel is indexed. Establish a linear calibration model so that the calibrated measurements Compared with the original measurement value satisfy:

[0087] Where the linear proportionality coefficient With zero bias coefficient Obtained by fitting the calibration sampling sequence; when the calibration residual or cross-point consistency does not meet the allowable conditions, a consistency anomaly event marker is output. And index the corresponding channel Marked as unavailable channel.

[0088] Step 5: Execute the withstand voltage process according to the boost and voltage regulation strategies, and simultaneously sample to form a multi-channel discrete sampling sequence. Specifically, generate the boost control sequence and the voltage regulation control sequence, and sort them according to the boost time. RMS value of AC withstand voltage From zero to During the voltage stabilization time The effective value of AC withstand voltage is internal. Maintain within the allowable fluctuation range; establish a shared sampling time base and generate a synchronization trigger signal during voltage boost and stabilization; initiate sampling for each independent measurement loop and output sampled data upon arrival of the synchronization trigger signal; assign channel identifiers to each workstation and assign window sequence numbers to the sampled data. With timestamp By channel identifier and window number With timestamp Assemble multi-channel discrete sampling sequences and write them into a structured record buffer.

[0089] Step six involves performing anti-aliasing filtering, windowing, and stability calculations on the multi-channel discrete sampling sequence. Specifically, for each channel index... The discrete sampling sequence execution cutoff frequency The corresponding anti-aliasing filter is used to obtain the filtered sequence, and the filtered sequence is processed according to the number of window points. Divide into a window sequence; for each window number Calculate the effective value of the leakage current in the window. Window leakage current RMS value Used to characterize the channel index In window number The effective value of the leakage current within the cavity can be calculated as follows:

[0090] Among them, the reconstructed current sample value By channel index The corresponding sampling resistor and channel gain are converted; the calculation window duration is then calculated. Window duration is used to characterize the duration of coverage for each window. It can be written as:

[0091] RMS value of leakage current in a continuous window range Perform mean and standard deviation calculations and generate the coefficient of variation. As a stability indicator, the coefficient of variation Used to characterize the channel index steady-state condition within a continuous window, coefficient of variation It can be written as:

[0092] Step 7: Perform calibration compensation and channel consistency verification and generate consistency anomaly event markers. Specifically, based on the linear scaling factor... With zero bias coefficient RMS value of leakage current at the window Perform calibration compensation to obtain the effective calibration value. calibrate effective value Used for subsequent threshold determination and cross-channel comparison; selected during the voltage stabilization stage to meet the coefficient of variation. A set of windows that does not exceed a stability threshold, based on the effective calibration value. Calculate channel consistency index and consistency threshold Comparison, when the channel consistency index Exceeding the consistency threshold Output consistency exception event flag Index the relevant channels Included in the abnormal channel set.

[0093] Step eight involves statistically analyzing communication links and generating communication health status, generating interlocking states, and executing voltage reduction or disconnection. Specifically, the multi-channel discrete sampling sequence is processed through... Upload via a short-range RF link. The link uses channel identification and sequence number addressing, and employs time slot scheduling and CRC16 checksum to reduce bit errors and collisions. The control end obtains the communication health status based on packet loss rate, CRC checksum failure rate, and timeout rate statistics. Communication health status Used to indicate whether the current communication meets the data integrity conditions required for the determination; the control terminal will indicate the ground continuity status. Communication health status Combine to generate interlocking states When the interlocking state If the interlocking conditions are not met, a step-down control command or a cut-off control command is generated and executed to reduce the effective value of the AC withstand voltage. The voltage drops back to a safe voltage at a preset rate and triggers the discharge process.

[0094] Step nine: Output channel determination results and abnormal event markers based on threshold comparison and abnormal triggering conditions. Specifically, for each channel index... Compare calibration effective values With leakage current threshold To generate a leak exceeding the limit event marker And compare the differences in effective values ​​of calibration between adjacent windows to generate abrupt event markers. , where mutation event markers The difference in calibrated effective values ​​can exceed the mutation threshold. Trigger; combined with coefficient of variation Channel consistency index Grounding continuity status Communication health status Output channel determination result With exception event tag set Exception event tag set It should include at least parameter anomaly event markers, electric field condition anomaly event markers, consistency anomaly event markers, and recording anomaly event markers, and be included in the anomaly event marker set. When the triggering condition is met, either reduce the voltage or cut off the circuit.

[0095] Step 10: Write structured records and generate chained digests to output the record consistency state. Specifically, this involves version identifiers... Channel determination results Exception event tag set Window number timestamp , Calibration RMS value Coefficient of variation Consistency index with channel Write structured records and assign record numbers. Generate record summaries from structured records. , record summary Linked to the previous chain summary Combine to obtain a combined digest and perform a hash calculation. Obtain chained digests Chained summary It can be written as:

[0096] Chained digest Used to output record consistency status When recording consistent state If the preset conditions are not met, output an abnormal event marker and perform voltage reduction or cutoff.

[0097] Step 11: Complete the voltage reduction, discharge, and test completion procedures, and output the test report. Specifically, during the voltage stabilization time... After termination or interlocking is triggered, the effective value of the AC withstand voltage is set to... The slope is lowered to zero according to the preset gradient, and discharge and grounding are performed at the equipotential boundary and the low-voltage end of the workstation. After the residual charge is released, the workstation clamp is released and the abnormal channel index is checked. The corresponding disc insulators are identified and isolated. The control terminal exports batch reports based on structured records and sorts them by record number. Provide a traceable chain of conclusions.

[0098] Through the complete implementation process described above, this method... Under power frequency AC withstand voltage conditions, 16 independent measurement circuits are used to achieve multi-channel parallel measurement of effective leakage current and stability constraints. Equipotential boundaries and equalizing electrodes are used to reduce the sudden increase in false leakage current caused by electric field inhomogeneity, corona, and partial discharge. The calibration model and consistency test suppress the impact of channel gain error and zero bias error on batch comparability. Interlocking is driven by communication health status and grounding continuity status to achieve failure safety and rapid disconnection. The structured record of version identification and chain summary ensures the traceability and verifiability of conclusions. Thus, the efficiency of batch testing is improved while taking into account test accuracy and test safety.

[0099] It should be understood that the step numbers identified by "Step 1, Step 2" and other similar forms in the above embodiments are only used to distinguish different steps and do not limit the steps to be executed in the order of these numbers. The specific execution order of each step can be adjusted according to its functional requirements and the inherent logic in the actual application scenario. The above step numbers should not be interpreted as a limitation on the implementation process of the embodiments of this application.

[0100] like Figure 2 As shown, the following is an embodiment of a disc-type insulator AC withstand voltage multi-channel leakage current detection system provided by this disclosure. This disc-type insulator AC withstand voltage multi-channel leakage current detection system belongs to the same inventive concept as the disc-type insulator AC withstand voltage multi-channel leakage current detection method in the above embodiments. For details not described in detail in the embodiments of the disc-type insulator AC withstand voltage multi-channel leakage current detection system, please refer to the embodiments of the disc-type insulator AC withstand voltage multi-channel leakage current detection method.

[0101] Based on the same concept, another embodiment of this application provides a multi-channel leakage current detection system for disc-type insulators under AC withstand voltage, comprising: Parameter unit 1 is used to set the parameter set and assign a version identifier. The parameter set includes AC withstand voltage, AC frequency, boost strategy, voltage regulation strategy, sampling parameters, judgment threshold and consistency threshold. Boundary unit 2 is used to establish an equipotential boundary and equalizing electrodes at the high voltage application location, and to connect the high voltage end of each disc insulator under test to the equipotential boundary. Sampling unit 3 is used to connect the low-voltage end of each disc insulator under test to the corresponding independent measurement circuit and return to the common grounding reference point. It boosts the voltage according to the boosting strategy and stabilizes the voltage according to the stabilizing strategy. During the boosting and stabilizing, it generates a synchronous trigger signal based on the shared sampling time base and synchronously samples each independent measurement circuit to obtain a multi-channel discrete sampling sequence. Metering unit 4 is used to perform anti-aliasing filtering and window division on the multi-channel discrete sampling sequence to obtain the effective value of leakage current and stability index of each window; Calibration unit 5 is used to establish calibration models for each channel and calibrate and compensate for window results, calculate channel consistency index and compare it with consistency threshold; Interlocking unit 6 is used to output channel judgment results and abnormal event flags based on judgment threshold, effective value of leakage current, stability index, channel consistency index, grounding continuity status, and communication health status, and to perform voltage reduction or disconnection when the grounding continuity status or communication health status is not met or the abnormal event flag meets the triggering conditions. The evidence storage unit 7 is used to write the channel determination result, abnormal event marker, and version identifier into the structured record.

[0102] In some embodiments of this application, the evidence storage unit 7 is further configured to generate a record digest based on the structured record and combine it with the record digest of the previous structured record to obtain a combined digest, perform hash calculation on the combined digest to obtain a chain digest, write the chain digest into the structured record and output the record consistency status, and when the record consistency status does not meet the preset record consistency conditions, the interlocking unit 6 outputs a record abnormal event flag and performs voltage reduction or cutoff.

[0103] The above-disclosed embodiments are merely preferred embodiments of the present invention, but the present invention is not limited thereto. Any non-creative variations that can be conceived by those skilled in the art, as well as any improvements and modifications made without departing from the principles of the present invention, should fall within the protection scope of the present invention.

Claims

1. A method for detecting AC withstand voltage multi-channel leakage current of a disc-type insulator, characterized in that, include: Set the parameter set and assign a version identifier. The parameter set includes AC withstand voltage, AC frequency, boost strategy, voltage regulation strategy, sampling parameters, judgment threshold and consistency threshold. Establish equipotential boundaries and equalizing electrodes at the high voltage application location. Connect the high voltage end of each disc insulator under test to the equipotential boundary, and connect the low voltage end to the corresponding independent measurement circuit and return to the common grounding reference point. The voltage is boosted according to the boost strategy and stabilized according to the stabilization strategy. During the boost and stabilization periods, each independent measurement circuit is sampled simultaneously to obtain a multi-channel discrete sampling sequence. Anti-aliasing filtering and windowing are performed on the multi-channel discrete sampling sequence to obtain the effective value of leakage current and stability index of each window; Establish calibration models for each channel and calibrate and compensate for window results; calculate channel consistency indices and compare them with consistency thresholds. Based on the judgment threshold, the effective value of leakage current, stability index, channel consistency index, grounding continuity status and communication health status, the channel judgment result and abnormal event flag are output. When the grounding continuity status or communication health status is not met or the abnormal event flag meets the triggering conditions, the voltage is reduced or disconnected, and the channel judgment result, abnormal event flag and version identifier are written into the structured record.

2. The method for detecting AC withstand voltage multi-channel leakage current of disc insulators as described in claim 1, characterized in that, The steps for setting the parameter set and assigning version identifiers include: Receives and writes the parameter inputs corresponding to AC withstand voltage, AC frequency, boost strategy, voltage regulation strategy, sampling parameters, judgment threshold and consistency threshold into the parameter set; Perform field integrity checks and field consistency checks on the parameter set. When the field integrity checks and field consistency checks meet the conditions, perform a digest calculation on the parameter set and assign the digest calculation result as a version identifier. When a field integrity check or field consistency check fails to meet the conditions, output a parameter exception event flag and write the parameter exception event flag to the structured record.

3. The method for detecting AC withstand voltage multi-channel leakage current of disc insulators as described in claim 2, characterized in that, The steps of establishing an equipotential boundary and equalizing electrodes at the high voltage application location include: An equipotential boundary is arranged at the location where high voltage is applied, and the electrical connection of the equipotential boundary is closed. A voltage equalization electrode is arranged outside the equipotential boundary, and the voltage equalization electrode is electrically connected to the equipotential boundary. Before boosting the voltage, potential consistency detection is performed on different sampling points at the equipotential boundary and the potential consistency status is output. Surface continuity detection is performed on the equalizing electrode and the surface qualification status is output. When the potential consistency state or surface qualification state does not meet the preset conditions, an abnormal electric field condition event flag is output and written into the structured record.

4. The method for detecting AC withstand voltage multi-channel leakage current of disc insulators as described in claim 1, characterized in that, The steps of boosting voltage according to a boost strategy and stabilizing voltage according to a stabilization strategy, and synchronously sampling each independent measurement loop during the boost and stabilization periods to obtain a multi-channel discrete sampling sequence, include: Read the boost and regulation strategies and generate boost and regulation control sequences, execute boost according to the boost control sequence and regulate according to the regulation control sequence; A shared sampling time base is established and a synchronization trigger signal is generated during the boost and stabilization phases. When the synchronization trigger signal arrives, sampling is initiated for each independent measurement loop and the sampling data is output. Each independent measurement loop is assigned a channel identifier, and the sampled data is assigned a window number and a timestamp. Based on the channel identifier, window number, and timestamp, a multi-channel discrete sampling sequence is assembled and written into a structured record.

5. The method for detecting AC withstand voltage multi-channel leakage current of disc insulators as described in claim 4, characterized in that, The steps for performing anti-aliasing filtering and windowing on multi-channel discrete sampling sequences to obtain the RMS value of leakage current and stability index for each window include: Perform anti-aliasing filtering on the multi-channel discrete sampling sequence according to the channel identifier and output the filtered sequence. Perform window division on each filtered sequence according to the window number and output the window sequence. The effective value of leakage current for each window is calculated based on the window sequence, and an effective value sequence is generated. The mean and standard deviation of the effective value sequence are calculated within the continuous window range, and the coefficient of variation is generated as a stability index and written into the structured record.

6. The method for detecting AC withstand voltage multi-channel leakage current of disc insulators as described in claim 3, characterized in that, The steps of establishing a calibration model for each channel, calibrating and compensating for the window results, calculating the channel consistency index, and comparing it with the consistency threshold include: Before boosting, a calibration process is performed on each independent measurement loop and a calibration sampling sequence is generated. A calibration model is then established for each channel based on the calibration sampling sequence. Based on the calibration model, the effective value of leakage current in each window is calibrated and compensated, and a sequence of calibrated effective values ​​is generated. Based on the sequence of calibrated effective values, the channel consistency index is calculated and compared with the consistency threshold. If the consistency conditions are not met, a consistency anomaly event flag is output and written into the structured record.

7. The method for detecting AC withstand voltage multi-channel leakage current of disc insulators as described in claim 6, characterized in that, Based on the judgment threshold, effective value of leakage current, stability index, channel consistency index, ground continuity status, and communication health status, the output channel judgment result and abnormal event flag are used. When the ground continuity status or communication health status is not met, or the abnormal event flag meets the triggering conditions, the following steps are performed: voltage reduction or disconnection. The communication health status is obtained based on the transmission statistics of multi-channel discrete sampling sequences through the communication link. The channel determination result is generated based on the comparison results of the effective value of leakage current, stability index, channel consistency index and determination threshold. Interlocking states are generated based on grounding continuity and communication health status. When the interlocking state does not meet the interlocking conditions or the abnormal event flag meets the triggering conditions, a step-down control command or a cut-off control command is generated and executed. Abnormal event flags include parameter abnormal event flags, electric field condition abnormal event flags, consistency abnormal event flags, and recording abnormal event flags.

8. The method for detecting AC withstand voltage multi-channel leakage current of disc insulators as described in claim 7, characterized in that, The steps of writing the channel determination result, exception event marker, and version identifier into the structured record include: Write the channel determination result, abnormal event marker, and version identifier into a structured record, and assign a record number to this structured record; A record summary is generated based on the structured record, and the record summary is combined with the record summary of the previous structured record to obtain a combined summary; Perform hash calculation on the combined digest to obtain a chain digest, write the chain digest into the structured record and output the record consistency status. When the record consistency status does not meet the preset record consistency conditions, output the record exception event flag and perform decompression or cut-off.

9. A multi-channel leakage current detection system for AC withstand voltage of disc insulators, characterized in that, include: The parameter unit is used to set the parameter set and assign a version identifier. The parameter set includes AC withstand voltage, AC frequency, boost strategy, voltage regulation strategy, sampling parameters, judgment threshold and consistency threshold. Boundary elements are used to establish equipotential boundaries and equalizing electrodes at the high voltage application location, and to connect the high voltage end of each disc insulator under test to the equipotential boundary. The sampling unit is used to connect the low-voltage end of each disc insulator under test to the corresponding independent measurement circuit and return to the common grounding reference point. It boosts the voltage according to the boosting strategy and stabilizes the voltage according to the stabilizing strategy. During the boosting and stabilizing, it generates a synchronous trigger signal based on the shared sampling time base and synchronously samples each independent measurement circuit to obtain a multi-channel discrete sampling sequence. The metering unit is used to perform anti-aliasing filtering and window division on the multi-channel discrete sampling sequence to obtain the effective value of leakage current and stability index of each window; The calibration unit is used to establish a calibration model for each channel and calibrate and compensate for the window results, calculate the channel consistency index and compare it with the consistency threshold. The interlocking unit is used to output channel judgment results and abnormal event flags based on the judgment threshold, effective value of leakage current, stability index, channel consistency index, grounding continuity status, and communication health status, and to perform voltage reduction or disconnection when the grounding continuity status or communication health status is not met or the abnormal event flag meets the triggering conditions. The evidence storage unit is used to write the channel determination result, abnormal event marker, and version identifier into a structured record.

10. The disc-type insulator AC withstand voltage multi-channel leakage current detection system as described in claim 9, characterized in that, The evidence storage unit is also used to generate a record digest based on the structured record and combine it with the record digest of the previous structured record to obtain a combined digest. It also performs a hash calculation on the combined digest to obtain a chain digest, writes the chain digest into the structured record and outputs the record consistency status. When the record consistency status does not meet the preset record consistency conditions, the interlocking unit outputs a record abnormal event flag and performs voltage reduction or cutoff.

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