Disclosed are a disc-type insulator AC voltage resistance multi-channel leakage current detection method and system

Abstract

The application belongs to the technical field of high-voltage electrical test and detection, and relates to a disc-type insulator alternating current withstand voltage multi-channel leakage current detection method and system. The method comprises the following steps: setting a parameter set comprising a withstand voltage, a frequency, a voltage raising and stabilizing strategy, sampling parameters, a judgment threshold and a consistency threshold, and generating a version identifier; constructing equipotential boundaries and voltage grading electrodes, and organizing a high-voltage end of a to-be-detected insulator, an independent measurement loop and a common ground reference point; synchronously sampling each loop during voltage raising and stabilizing to obtain a multi-channel sequence; filtering and windowing the sequence to obtain an effective value and a stability index; compensating and calculating a consistency index; combining the threshold, a ground state and a communication state to output a judgment and an event marker, triggering voltage reduction or disconnection, and structuring evidence. The technical scheme of the application is suitable for batch detection of alternating current withstand voltage, and can realize judgment robustness and channel consistency control.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of high-voltage electrical test and detection, and particularly relates to a disc-type insulator AC voltage resistance multi-channel leakage current detection method and system. BACKGROUND

[0002] In the prior art, the leakage current detection of the disc-type insulator AC voltage resistance test usually relies on the AC voltage resistance test device in cooperation with the leakage current meter or the multi-channel acquisition equipment to meet the batch detection needs of the factory inspection and operation and maintenance sampling by reading the current of the measured loop in the voltage boosting and stabilizing stage and giving the pass or fail judgment. However, the existing leakage current detection method has some obvious deficiencies in the consistency of the results of the multi-station parallel measurement and the determination robustness in the strong electromagnetic environment.

[0003] In actual application, the electric field distribution, the wiring layout and the public reference point organization mode of the AC voltage resistance test area are easy to introduce the capacitive coupling and the electromagnetic induction, and the leakage current signal is superimposed with random pulse components such as corona and partial discharge, so that the time window fluctuation amplitude of the multi-channel reading is large, the comparability between channels is weak, the determination basis based on the simple threshold or single reading has weak stability, the comparison of the results in the review and repeated test is also weak, and then the abnormal event recognition accuracy and the batch determination consistency are overall low.

[0004] Therefore, the prior art often has problems such as low anti-interference robustness of the whole flow and determination in the disc-type insulator AC voltage resistance batch detection, and limited consistency control level of the parallel station results. This is the deficiency of the prior art.

[0005] Therefore, the application provides a disc-type insulator AC voltage resistance multi-channel leakage current detection method and system to solve the above-mentioned defects in the prior art, which is very necessary. SUMMARY

[0006] The purpose of the application is to provide a disc-type insulator AC voltage resistance multi-channel leakage current detection method and system to solve the above-mentioned technical problems in view of the defects of the prior art that the whole flow and determination in the disc-type insulator AC voltage resistance batch detection have low anti-interference robustness, and the parallel station result consistency control level is limited.

[0007] To achieve the above-mentioned purpose, the application provides the following technical scheme:

[0008] In a first aspect, the application provides a disc-type insulator AC voltage resistance multi-channel leakage current detection method, comprising:

[0009] Set parameter set and assign version identifier, parameter set includes AC withstand voltage, AC frequency, voltage boosting strategy, voltage stabilizing strategy, sampling parameter, determination threshold and consistency threshold;

[0010] Establish equipotential boundary and voltage equalizing electrode at high voltage application position, connect high voltage end of each disc type insulator to be tested to equipotential boundary, connect low voltage end to corresponding independent measurement loop and return to common ground reference point;

[0011] Boost voltage according to voltage boosting strategy and stabilize voltage according to voltage stabilizing strategy, synchronously sample each independent measurement loop during voltage boosting and voltage stabilizing to obtain multi-channel discrete sampling sequence;

[0012] Perform anti-aliasing filtering and window division on multi-channel discrete sampling sequence to obtain leakage current effective value and stability index of each window;

[0013] Establish calibration model for each channel and calibrate and compensate window result, calculate channel consistency index and compare with consistency threshold;

[0014] Output channel determination result and abnormal event marker based on determination threshold, leakage current effective value, stability index, channel consistency index, ground continuity state and communication health degree state, perform voltage reduction or cut-off when ground continuity state or communication health degree state does not meet or abnormal event marker meets triggering condition, and write channel determination result, abnormal event marker and version identifier into structured record.

[0015] By parameter set versioning, AC withstand voltage field boundary control, multi-channel synchronous sampling and windowed measurement, channel calibration compensation and consistency constraint, and incorporating ground and communication states into interlocking determination, the above technical solution realizes comparable collection and reliable determination of multi-channel leakage current in disc type insulator AC withstand voltage batch detection scenario, can improve the robustness of the basis for judgment in strong electromagnetic environment and improve the consistency control level of parallel station results, and meets the needs of high robustness of current measurement determination and controllable consistency of parallel station results in disc type insulator AC withstand voltage batch detection.

[0016] The parameter set and the version identification make the test configuration have clear traceability and comparison reference, the equipotential boundary and the voltage equalizing electrode make the electric field condition of the pressure applying area more consistent and reduce the influence of random disturbance on the measurement, the synchronous sampling and the anti-aliasing filtering combine with the window division to make the leakage current representation change from instantaneous reading to time window statistics and enhance the cross-window comparison, the calibration model and the compensation processing make the channel gain and bias difference be quantitatively corrected and provide a unified scale for the consistency index, the consistency threshold constraint makes the multi-channel results keep convergence under the same judgment scale, the comprehensive threshold judgment and the stability index are combined with the ground continuity state and the communication health state to make the abnormal event identification more reliable, and the voltage reduction or cut-off and the structured record writing make the test process and the judgment conclusion have a traceable evidence chain.

[0017] Preferably, the step of setting the parameter set and assigning the version identification comprises:

[0018] Receiving parameter inputs corresponding to the AC withstand voltage, the AC frequency, the voltage boosting strategy, the voltage stabilizing strategy, the sampling parameter, the judgment threshold and the consistency threshold and writing the parameter inputs into the parameter set;

[0019] Performing field integrity check and field consistency check on the parameter set, and when the field integrity check and the field consistency check meet the conditions, performing digest calculation on the parameter set and assigning the digest calculation result as the version identification;

[0020] When the field integrity check or the field consistency check does not meet the conditions, outputting a parameter abnormal event marker and writing the parameter abnormal event marker into the structured record.

[0021] By using the above technical solution, the field integrity and consistency check are combined with the digest calculation to form the version identification, the standardization and version solidification of the test parameter input are realized, the configuration consistency and the comparison of the repeated experiments are improved, and the influence of parameter drift on the judgment stability is reduced.

[0022] Preferably, the step of establishing the equipotential boundary and the voltage equalizing electrode at the high-voltage applying position comprises:

[0023] Arranging the equipotential boundary at the high-voltage applying position and completing the electrical connection closure of the equipotential boundary;

[0024] Arranging the voltage equalizing electrode outside the equipotential boundary and completing the electrical connection of the voltage equalizing electrode and the equipotential boundary;

[0025] Performing potential consistency detection on different sampling points of the equipotential boundary before voltage boosting and outputting a potential consistency state, and performing surface continuity detection on the voltage equalizing electrode and outputting a surface qualified state;

[0026] When the potential consistency state or the surface eligibility state does not satisfy the preset condition, an electric field condition abnormal event flag is output, and the electric field condition abnormal event flag is written into the structured record.

[0027] By using the above technical solution, the equipotential boundary is closed and connected, the outer coupling of the voltage equalizing electrode is combined, the potential consistency detection and the surface continuity detection are introduced, the verifiable confirmation of the electric field condition before pressure is realized, the electric field consistency of the pressure area is improved, and the repeatability of the flow measurement result is improved.

[0028] As preferred, the step of boosting according to the boosting strategy and stabilizing according to the stabilizing strategy, and synchronously sampling each independent measurement loop during the boosting and the stabilizing to obtain a multi-channel discrete sampling sequence, includes:

[0029] The boosting control sequence and the stabilizing control sequence are generated by reading the boosting strategy and the stabilizing strategy, the boosting is performed according to the boosting control sequence, and the stabilizing is performed according to the stabilizing control sequence.

[0030] A shared sampling time base is established during the boosting and the stabilizing, and a synchronous trigger signal is generated, sampling of each independent measurement loop is started and sampling data is output when the synchronous trigger signal arrives.

[0031] Channel identifiers are assigned to each independent measurement loop, window numbers and time stamps are assigned to the sampling data, a multi-channel discrete sampling sequence is assembled based on the channel identifiers, the window numbers and the time stamps, and is written into the structured record.

[0032] By using the above technical solution, the boosting control sequence and the stabilizing control sequence are combined, the synchronous trigger is generated with the help of the shared sampling time base, the channel identifiers, the window numbers and the time stamps are assigned to the data, the time alignment of the multi-channel sampling and the data organization specification are realized, the cross-channel comparison accuracy is improved, and the certainty of the abnormal event positioning is enhanced.

[0033] As preferred, the step of performing the anti-aliasing filtering and the window division on the multi-channel discrete sampling sequence to obtain the leakage current effective value and the stability index of each window, includes:

[0034] The anti-aliasing filtering is respectively performed on the multi-channel discrete sampling sequence according to the channel identifiers, and a filtering sequence is output, the window division is performed on each filtering sequence according to the window number, and a window sequence is output.

[0035] The leakage current effective value of each window is calculated based on the window sequence, an effective value sequence is generated, the mean value and the standard deviation calculation are performed on the effective value sequence within a continuous window range, a variation coefficient is generated as the stability index, and is written into the structured record.

[0036] According to the technical scheme, the anti-aliasing filtering is performed on the channels, the leakage current effective value is calculated by windowing, the coefficient of variation is obtained by combining the continuous window mean value and the standard deviation, the amplitude representation and the fluctuation representation of the leakage current are realized, and the stability representation capability and the anti-random disturbance capability of the discrimination basis are improved.

[0037] Preferably, the step of establishing a calibration model for each channel, calibrating and compensating the window results, calculating the channel consistency index, and comparing the channel consistency index with the consistency threshold value, comprises:

[0038] A calibration sampling sequence is generated by performing a calibration process on each independent measurement circuit before boosting, and a calibration model is established for each channel based on the calibration sampling sequence;

[0039] The leakage current effective value of each window is calibrated and compensated based on the calibration model, and a calibrated effective value sequence is generated, the channel consistency index is calculated based on the calibrated effective value sequence, and compared with the consistency threshold value, and when the comparison does not meet the consistency condition, an consistency abnormal event marker is output and written into the structured record.

[0040] According to the technical scheme, the calibration sampling sequence is generated by the calibration process before boosting, and the channel calibration model is established, the consistency index is calculated after the window effective value is compensated, and compared with the consistency threshold value, the channel scale is unified and the consistency quantization constraint is realized, the comparability of the parallel station results is improved, and the consistency control level of batch judgment is improved.

[0041] Preferably, the step of outputting the channel judgment result and the abnormal event marker based on the judgment threshold value, the leakage current effective value, the stability index, the channel consistency index, the grounding continuity state and the communication health state, and performing the step of reducing the voltage or cutting off when the grounding continuity state or the communication health state does not meet or the abnormal event marker meets the triggering condition, comprises:

[0042] The communication health state is obtained by transmitting and counting the multi-channel discrete sampling sequence based on the communication link;

[0043] The channel judgment result is generated based on the comparison results of the leakage current effective value, the stability index and the channel consistency index with the judgment threshold value;

[0044] The interlocking state is generated based on the grounding continuity state and the communication health state, and the voltage reduction control instruction or the cutting off control instruction is generated and executed when the interlocking state does not meet the interlocking condition or the abnormal event marker meets the triggering condition, and the abnormal event marker includes the parameter abnormal event marker, the electric field condition abnormal event marker, the consistency abnormal event marker and the record abnormal event marker.

[0045] According to the technical scheme, the communication health state is formed based on transmission statistics, and is combined with the grounding continuity state to generate an interlocking state, and the comparison results of the effective value, stability index and consistency index are aggregated as a channel determination result, so that the determination basis and the safety state are cooperatively closed, and the reliability of abnormal event disposal and the safety certainty of the test process can be improved.

[0046] As preferred, the step of writing the channel determination result, the abnormal event marker and the version identifier into the structured record comprises:

[0047] The channel determination result, the abnormal event marker and the version identifier are written into the structured record, and a record serial number is allocated to the structured record;

[0048] A record digest is generated based on the structured record, and the record digest is combined with a record digest of a previous structured record to obtain a combined digest;

[0049] Hash calculation is performed on the combined digest to obtain a chain digest, the chain digest is written into the structured record, and a record consistency state is outputted; when the record consistency state does not satisfy a preset record consistency condition, a record abnormal event marker is outputted and pressure reduction or cutting is performed.

[0050] According to the technical scheme, the record serial number and the record digest are used to generate the combined digest, and the hash calculation is performed to obtain the chain digest written into the structured record, so that the consistency verification and traceability constraint of the record chain are realized, and the data credibility and audit checkability are improved, and the evidence stability of the batch detection conclusion is enhanced.

[0051] In a second aspect, the application also provides a disc-type insulator AC voltage withstand multi-channel leakage current detection system, comprising:

[0052] A parameter unit is configured to set a parameter set and allocate a version identifier, and the parameter set comprises an AC voltage withstand voltage, an AC frequency, a boosting strategy, a voltage stabilizing strategy, a sampling parameter, a determination threshold and a consistency threshold;

[0053] A boundary unit is configured to establish an equipotential boundary and a voltage equalizing electrode at a high-voltage application position, and connect a high-voltage end of each disc-type insulator to be tested to the equipotential boundary;

[0054] A sampling unit is configured to connect a low-voltage end of each disc-type insulator to be tested to a corresponding independent measurement loop and back to a common ground reference point, boost according to the boosting strategy and stabilize voltage according to the voltage stabilizing strategy, and generate a synchronous trigger signal based on a shared sampling time base during the boosting and voltage stabilizing, and synchronously sample each independent measurement loop to obtain a multi-channel discrete sampling sequence;

[0055] A metering unit is configured to perform anti-aliasing filtering and window division on the multi-channel discrete sampling sequence to obtain a leakage current effective value and a stability index of each window.

[0056] a calibration unit configured to establish a calibration model for each channel, calibrate and compensate the window result, calculate a channel consistency index, and compare the channel consistency index with a consistency threshold value;

[0057] an interlocking unit configured to output a channel determination result and an abnormal event flag based on the determination threshold value, the leakage current effective value, the stability index, the channel consistency index, the ground continuity state, and the communication health state, and perform voltage reduction or disconnection when the ground continuity state or the communication health state does not meet a condition or the abnormal event flag meets a trigger condition;

[0058] a storage unit configured to write the channel determination result, the abnormal event flag, and a version identifier into a structured record.

[0059] Preferably, the storage unit is further configured to generate a record digest based on the structured record, combine the record digest with a record digest of a previous structured record to obtain a combined digest, perform a hash calculation on the combined digest to obtain a chain digest, write the chain digest into the structured record, and output a record consistency state, and the interlocking unit is configured to output a record abnormal event flag and perform voltage reduction or disconnection when the record consistency state does not meet a preset record consistency condition.

[0060] As can be seen from the above technical solutions, the present application has the following advantages:

[0061] In the disc-type insulator AC voltage resistance multi-channel leakage current detection method and system provided by the present application, parameter set versioning, AC voltage resistance electric field boundary control, multi-channel synchronous sampling and windowed measurement, channel calibration compensation and consistency constraint, and the ground and communication states are included in the interlocking determination, to realize comparable collection and reliable determination of multi-channel leakage current in the disc-type insulator AC voltage resistance batch detection scene, improve the robustness of the determination basis in a strong electromagnetic environment and the parallel station result consistency control level, and meet the requirements of high determination robustness and controllable parallel station result consistency in disc-type insulator AC voltage resistance batch detection. BRIEF DESCRIPTION OF DRAWINGS

[0062] In order to more clearly illustrate the technical solutions of the present application, the drawings required in the description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0063] Figure 1 is a flowchart of a disc-type insulator AC voltage resistance multi-channel leakage current detection method provided by the present application;

[0064] Figure 2It is a kind of disc type insulator AC voltage resistance multi-channel leakage current detection system principle block diagram provided by the application.

[0065] Wherein, 1. parameter unit, 2. boundary unit, 3. sampling unit, 4. metrology unit, 5. calibration unit, 6. interlocking unit, 7. storage unit. DETAILED DESCRIPTION

[0066] Various embodiments of the present disclosure are described more fully below with reference to the accompanying drawings. The present disclosure can have various embodiments, and adjustments and changes can be made therein. However, it should be understood that there is no intention to limit various embodiments of the present disclosure to the specific embodiments disclosed herein, but the present disclosure should be understood to encompass all adjustments, equivalents, and / or alternatives falling within the spirit and scope of various embodiments of the present disclosure.

[0067] Hereinafter, the term "include" or "may include" used in various embodiments of the present disclosure indicates the presence of the disclosed functions, operations, or elements, and does not limit the addition of one or more functions, operations, or elements. In addition, as used in various embodiments of the present disclosure, the terms "include", "have", and their cognates merely mean to indicate the presence of specific features, numbers, steps, operations, elements, components, or combinations of the foregoing, and should not be understood as first excluding the presence or addition of one or more other features, numbers, steps, operations, elements, components, or combinations of the foregoing.

[0068] It needs to be explained in advance that, in order to clearly and accurately describe the technical solutions of the embodiments of the present application, the following briefly describes some terms and related technologies involved in the embodiments of the present application:

[0069] 1, leakage current effective value: usually defined by RMS (Root Mean Square, RMS), used to represent the equivalent amplitude of AC current in a cycle or given time window, which is calculated based on the square mean value of sampling points and then opened, which is more suitable for amplitude evaluation and threshold determination in AC voltage resistance process than instantaneous value.

[0070] 2, anti-aliasing filter: a common band-limiting means before and after discrete sampling of analog signals, which suppresses high-frequency components more than half of the sampling frequency to avoid high-frequency components folding into low frequencies after sampling to form aliasing interference, thereby improving the representation authenticity and comparability of discrete sampling sequence to target frequency band current components.

[0071] 3. Hash calculation and chain digest: Hash is usually referred to as Hash calculation, which is a calculation method of mapping data of arbitrary length to fixed length digest. Chain digest is a digest form obtained by combining the current record digest with the last record digest and then hashing, which forms a check chain between records to facilitate the verification of the integrity and consistency of the records.

[0072] In view of the problems in the batch detection process of disc type insulator AC voltage resistance, such as large fluctuation amplitude of multi-channel measurement results in strong electromagnetic environment and complex electric field conditions, weak comparability of parallel stations, weak robustness of discrimination basis, and limited consistency control level of batch determination, which cannot meet the actual needs of operation and quality inspection for multi-station rapid determination, consistent and controllable results, and process traceability, the embodiment of the present application discloses a disc type insulator AC voltage resistance multi-channel leakage current detection method and system. By introducing parameter set version management, controlled electric field boundary organization, and multi-channel synchronous sampling measurement mechanism, combined with channel calibration compensation and consistency constraint, interlocking determination and structured recording, reliable representation and consistent determination of leakage current in AC voltage resistance process are realized, thereby improving the robustness of measurement and determination under strong interference conditions and improving the consistency control level of parallel station results, and further enhancing the safety certainty of abnormal event handling and the verifiability of detection conclusion.

[0073] The technical solutions in the embodiments of the present application will be described clearly and completely in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0074] As shown in Figure 1 The disc type insulator AC voltage resistance multi-channel leakage current detection method provided by the embodiment includes:

[0075] Step S1: setting a parameter set and assigning a version identifier, the parameter set including AC voltage resistance voltage, AC frequency, voltage boosting strategy, voltage stabilizing strategy, sampling parameter, determination threshold, and consistency threshold;

[0076] Step S2: establishing an equipotential boundary and a voltage equalizing electrode at a high voltage application position, connecting the high voltage end of each disc type insulator to be tested to the equipotential boundary, connecting the low voltage end to the corresponding independent measurement loop and returning to the common ground reference point;

[0077] Step S3: boosting voltage according to the voltage boosting strategy and stabilizing voltage according to the voltage stabilizing strategy, and synchronously sampling each independent measurement loop to obtain multi-channel discrete sampling sequences during voltage boosting and stabilizing;

[0078] Step S4: Anti-aliasing filtering and window division are performed on the multi-channel discrete sampling sequence to obtain the leakage current effective value and stability index of each window;

[0079] Step S5: A calibration model is established for each channel, and the window results are calibrated and compensated. The channel consistency index is calculated and compared with the consistency threshold;

[0080] Step S6: Based on the decision threshold, leakage current effective value, stability index, channel consistency index, ground continuity state and communication health state, the channel decision result and abnormal event marker are output. When the ground continuity state or communication health state does not meet or the abnormal event marker meets the triggering condition, the voltage is reduced or cut off, and the channel decision result, abnormal event marker and version identification are written into the structured record.

[0081] The embodiment adopts parameter set version management and abstract solidification mechanism, so that the key configurations such as AC withstand voltage, frequency, voltage boosting and stabilizing strategy, sampling and decision threshold have consistent and traceable version reference, thereby providing stable reference for cross-batch review and result comparison of batch detection; By organizing equipotential boundary at high voltage application position and configuring voltage equalizing electrode, the electric field conditions of pressure application area are more consistent and the influence of random disturbance on leakage current representation is suppressed, and the measurement stability and comparability between stations are considered in strong electromagnetic environment; By establishing shared sampling time base during voltage boosting and stabilizing and performing multi-channel synchronous sampling, anti-aliasing filtering and windowed measurement are performed, so that the leakage current is converted from instantaneous reading to window statistics and stability representation is introduced, thereby improving the robustness of the discrimination basis and the ability to distinguish abnormal fluctuations; By performing calibration on each channel before the test and compensating the window results, and using the consistency index to constrain the convergence of parallel channels, the channel size difference is quantitatively controlled and the consistency control level of batch judgment is improved; By including the leakage current measurement results, ground continuity state and communication health state into the interlocking decision logic, and executing voltage reduction or cut-off when the triggering condition is met, the abnormal event disposal has higher safety certainty and reduces the repeated test cost caused by misjudgment; At the same time, by writing the decision result, abnormal event and version identification into the structured record, the detection process and conclusion form a verifiable evidence chain, and the traceability and audit availability in operation and quality inspection scenarios are improved.

[0082] It needs to be noted that in the embodiments of the present application, the disc type insulator AC voltage withstand multi-channel leakage current detection method runs on a set of AC voltage withstand test detection device, which is composed of a multi-station voltage withstand support, an electric rotating position changing mechanism, an AC high voltage application and electric field boundary control assembly, a multi-channel leakage current collection and metering module, a wireless communication link, a control terminal and a record storage unit, and a safety interlocking link, which is used to apply voltage to multiple disc type insulators in parallel and synchronously acquire leakage current data of each station under AC voltage withstand strong electromagnetic environment, so as to realize batch detection and fault station positioning.

[0083] In terms of structural bearing, the multi-station voltage withstand support adopts a double-layer arrangement to integrate multiple independent detection stations in a limited space, each station is configured with an independent insulation branch and an electrode assembly, which can support synchronous application of AC voltage withstand voltage to multiple insulators, and the position of the insulator is changed and positioned by the electric rotating system, the rotating speed is adjustable and supports remote control operation, so that the installation and position changing process is completed in a fixed position, reducing the operation complexity and risk caused by personnel moving around the device.

[0084] In terms of AC high voltage application and electric field boundary control, the high voltage application end is configured with an equipotential boundary and a voltage equalizing electrode assembly, the voltage equalizing cover is integrally formed in a circular structure and reliably connected with the test electrode to form an equipotential body, the smooth continuous curved surface and sufficient curvature radius are used to realize electric field distribution optimization, suppress the interference of phenomena such as corona and partial discharge caused by edge field strength concentration on leakage current judgment, and make the electric field conditions of parallel stations more consistent and closer to actual operating conditions.

[0085] In terms of grounding and safety bearing, each station is configured with an automatic grounding spring device and is linked with the station action, when the insulator is placed in position, the spring is triggered to contract to realize automatic adhesion and conduction of the grounding electrode, after the test is completed, the spring is reset to realize automatic disconnection of the grounding loop, forming an automatic grounding process matched with the electric rotating position changing, and providing a grounding continuity basis condition for subsequent interlocking judgment, so as to reduce the discharge risk and personnel contact risk in high voltage test.

[0086] In terms of leakage current collection, metering and communication bearing, each station is configured with an independent leakage current test module, the module uses a sampling resistor to convert a small current into a measurable voltage signal, combines a filter circuit to complete noise reduction and anti-interference conditioning, and then gets a digital quantity through analog-to-digital conversion, realizes multi-channel parallel metering and reduces crosstalk and common mode coupling between channels, reports the multi-channel station data to the control terminal through a short-range radio frequency wireless link, and improves transmission reliability under high voltage strong electromagnetic environment and reduces the risk of misjudgment caused by error code and packet loss by combining address, serial number, CRC check and time slot scheduling mechanism.

[0087] In the control end and the record storage bearing, the control end is used for receiving and displaying the leakage current data of each station and comparing with the threshold to complete the judgment and fault station positioning, and combining the communication link quality statistics to form the communication health degree related state quantity, and further combining the grounding continuity, emergency stop link, test parameter legality and other pressurization permission conditions to form a logic lock, and any condition failure enters the failure safety state and triggers the depressurization or cut-off, and at the same time, the test parameters, threshold version, channel calibration coefficient, communication quality and event log are written into the record chain to support the retest, comparison and engineering traceability.

[0088] Hereinafter, according to the embodiments of the present application, the above steps S1 to S6 are specifically described.

[0089] 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 voltage withstand test before the test starts, and output a traceable version identifier to constrain the consistent reference of the same set of parameters by subsequent pressurization, sampling, measurement, judgment and storage.

[0090] Specifically, a parameter set can be set and a version identifier can be assigned; in the embodiments of the present application, the parameter set includes AC voltage withstand voltage, AC frequency, pressurization strategy, voltage stabilization strategy, sampling parameter, judgment threshold and consistency threshold. Among them, the AC voltage withstand voltage effective value adopts characterization, unit ; the AC frequency adopts characterization, unit ; the pressurization strategy is at least used to determine the pressurization time, slope and stage switching condition, the pressurization time adopts characterization, unit ; the voltage stabilization strategy is at least used to determine the voltage stabilization time and steady state criterion, the voltage stabilization time adopts characterization, unit ; the sampling parameter at least includes sampling frequency, window point number and filter cutoff frequency, the sampling frequency adopts characterization, unit , the window point number adopts window point number characterization, the filter cutoff frequency adopts characterization, unit ; the judgment threshold at least includes the leakage current threshold and the mutation threshold, the leakage current threshold adopts characterization, unit , the mutation threshold adopts characterization, unit ; the consistency threshold is used to constrain the upper limit of deviation or the upper limit of statistical deviation of multi-channel results, and adopts Characterization. In the embodiments of the present application, the input of the parameter set can come from local interactive input, pre-set process library or external interface, and can be directly stored in the database for subsequent structured record reference in the receiving link.

[0091] In some embodiments of the present application, the parameter inputs corresponding to the AC withstand voltage, AC frequency, voltage boosting strategy, voltage stabilizing strategy, sampling parameter, judgment threshold and consistency threshold can be received and written into the parameter set. Further, in order to make the parameter set have traceability and tamper-proof relevance, field integrity check and field consistency check can be performed on the parameter set; when the field integrity check and the field consistency check meet the conditions, the parameter set is executed to calculate the digest and the digest calculation result is assigned as the version identification. The version identification can use a hash digest string or a fixed-length binary digest, and the digest input at least contains the fields of AC withstand voltage effective value , AC frequency , voltage boosting time , voltage stabilizing time , sampling frequency , window point number , cutoff frequency , leakage current threshold , mutation threshold and consistency threshold , so that the version identification is sensitive to the change of the key process caliber. Exemplarily, the , , , , , , , , . When the field integrity check or the field consistency check does not meet the conditions, an abnormal parameter event marker is output and written into the structured record.

[0092] So far, step S1 forms a parameter management system for voltage boosting, sampling and judgment driven by unified caliber by parameterizing and versioning the test process parameters and the metering criterion parameters, providing verifiable input boundary and traceable version anchor point for subsequent processes.

[0093] In step S2, the core task is to construct a controlled electric field boundary condition at the high-voltage application end and organize multi-station electrical connection, so that each high-voltage end of the disc-shaped insulator under test is under the same potential boundary, while each low-voltage end enters an independent measurement loop isolated from each other and returns to a common ground reference point, to reduce the coupling between stations and suppress the false current surge caused by edge field strength concentration.

[0094] Specifically, the equipotential boundary and the voltage equalizing electrode can be established at the high-voltage application position, where the equipotential boundary can be formed by a conductive voltage equalizing cover or a conductive voltage equalizing ring, and the voltage equalizing electrode can adopt a smooth continuous curved surface structure to obtain a larger curvature radius and reduce local field strength concentration; in the embodiments of the present application, multiple workstations can be arranged in a limited space, for example, an arrangement mode of double layers of workstations, and a circular voltage equalizing cover is integrated at the high-voltage application end to improve the electric field distribution, so that the multiple workstations are in a more consistent electric field condition.

[0095] In some embodiments of the present application, in order to make the electrical connection closed and the potential boundary effective, an equipotential boundary can be further arranged at the high-voltage application position and the electrical connection of the equipotential boundary is completed, and a voltage equalizing structure is arranged outside the equipotential boundary to suppress the edge effect, that is, a voltage equalizing electrode is arranged outside the equipotential boundary and the electrical connection of the voltage equalizing electrode and the equipotential boundary is completed. Then, the measured object is organized by workstations, so that the high-voltage end of each disc-type insulator to be measured is connected to the equipotential boundary, and the low-voltage end is connected to the corresponding independent measurement loop and returns to the common ground reference point, where the common ground reference point is a withstand voltage test grounding busbar or an equivalent common ground point, and the independent measurement loop can set an independent sampling resistor and a front-end conditioning link at each workstation and keep the loop wiring isolated to suppress common mode coupling and crosstalk.

[0096] Further, in order to verify the electric field and connection conditions before pressurization, the equipotential boundary can be sampled at multiple points and the surface state of the voltage equalizing electrode can be checked; in the embodiments of the present application, the potential consistency of the equipotential boundary can be detected at different sampling points before boosting and the potential consistency state is output, and the surface continuity of the voltage equalizing electrode can be detected and the surface qualified state is output. Wherein, the potential consistency detection can obtain the potential readings of multiple sampling points through a contact potential probe or a non-contact potential sensing method, and compare with the allowed deviation to output the potential consistency state; the surface continuity detection can confirm that there is no sharp end, burr or continuity damage area on the surface of the voltage equalizing electrode through visual inspection and surface resistance test, so as to reduce the risk of corona and partial discharge. When the potential consistency state or the surface qualified state does not meet the preset condition, an electric field condition abnormal event marker is output and written into a structured record.

[0097] So far, step S2 organizes the electric field and wiring in cooperation with the "equipotential boundary-voltage equalizing electrode-independent loop-common reference" to form a reproducible multiple workstation controlled electric field and a low-coupling measurement flow basis, which provides a stable electric field boundary and loop topology premise for subsequent boosting sampling.

[0098] In step S3, the core task is to generate executable high-voltage control sequences according to the boosting strategy and the stabilizing strategy, and to establish a shared sampling time base during the boosting and stabilizing stages to achieve multi-channel synchronous sampling, thereby ensuring comparability of multi-stations under the same time reference and the same window division and supporting time alignment capture of mutation events.

[0099] Specifically, boosting can be performed according to the boosting strategy, and stabilizing can be performed according to the stabilizing strategy, and multi-channel sampling can be triggered simultaneously during the boosting and stabilizing processes to form a multi-channel discrete sampling sequence, i.e., synchronous sampling of each independent measurement loop during the boosting and stabilizing periods to obtain a multi-channel discrete sampling sequence.

[0100] In some embodiments of the present application, to enable the boosting and stabilizing processes to be reproduced by the control end, the boosting strategy and the stabilizing strategy can be read from the parameter set first, and control sequences can be generated, and then the execution closed loop is completed. To this end, the boosting strategy and the stabilizing strategy can be read, and boosting control sequences and stabilizing control sequences can be generated, and further, boosting can be performed according to the boosting control sequences, and stabilizing can be performed according to the stabilizing control sequences. The boosting control sequences can adopt linear or piecewise linear voltage setting sequences, and the stabilizing control sequences can adopt the mode of constant setting and allowable fluctuation band, and the effective value of the AC withstand voltage can be continuously monitored during the stabilizing stage and the AC frequency whether within the allowable deviation range to judge the steady state condition.

[0101] Further, multi-channel synchronous sampling relies on a shared sampling time base and a synchronous triggering mechanism. In embodiments of the present application, a shared sampling time base can be established during the boosting and stabilizing periods, and a synchronous triggering signal can be generated, and when the synchronous triggering signal arrives, sampling of each independent measurement loop can be started and sampling data can be output. Exemplarily, the shared sampling time base can be implemented by unified sampling clock distribution or unified synchronous frame triggering, and the sampling data can be a discrete voltage sample sequence output by each channel analog front end or a discrete current sample sequence after local conversion. Further, to support subsequent anti-aliasing processing, window metering and consistency checking, the channel, window and time need to be labeled at the data level. In embodiments of the present application, a channel identifier can be assigned to each independent measurement loop, and a window sequence number and a time stamp can be assigned to the sampling data, so that the sampling data has indexability in structured recording. At the same time, a multi-channel discrete sampling sequence can be assembled according to the identification rule and written into the record, so that the multi-channel discrete sampling sequence is assembled based on the channel identifier, the window sequence number and the time stamp and written into the structured record.

[0102] So far, step S3 forms a collection system with "controlled pressurization-synchronous sampling-indexable data" by sequencing the boosting and stabilizing control sequences and sharing the sampling time base, and provides a window-synchronous, phase-aligned data basis for subsequent digital metering and anomaly detection in a strong interference environment.

[0103] In step S4, the core task is to perform anti-aliasing filtering, window division and robust metering on the multi-channel discrete sampling sequence, output the effective value of the leakage current of each window and construct the stability index, thereby providing calculable basis for the over-limit determination, breakdown determination and steady-state window selection.

[0104] Specifically, anti-aliasing filtering and window division can be performed on the multi-channel discrete sampling sequence, thereby obtaining the effective value of the leakage current of each window and the stability index. In the embodiments of the present application, the channel index is represented by channel index ; the instantaneous value of the leakage current of each channel is represented by leakage current instantaneous value ; the unit is ; the sampling resistance is set for each channel to convert the leakage current into a voltage signal, and the sampling resistance is represented by sampling resistance ; the unit is ; the voltage across the sampling resistance is represented by voltage across sampling resistance ; the unit is ; and the relationship can be written as:

[0105]

[0106] On this basis, the voltage across the sampling resistance is differentially amplified and anti-aliasing filtered, and the amplified analog signal is represented by amplified analog signal ; the channel equivalent gain is represented by channel equivalent gain ; and can be written as:

[0107]

[0108] Further, the cutoff frequency is used to constrain the bandwidth of the anti-aliasing low-pass filter to cover the alternating current frequency and the necessary harmonics and suppress radio frequency and switching noise. When the discrete sequence is sampled, the amplified analog signal is discretized into a discrete sampling sequence , and the reconstructed current sequence is obtained by converting according to the channel gain and the sampling resistance, and can be written as:

[0109]

[0110] In some embodiments of the present application, window division is used to aggregate the reconstructed current sequence into a window sequence according to a fixed number of points; for example, anti-aliasing filtering can be performed on the multi-channel discrete sampling sequence according to the channel identifier, and the filtered sequence is output, and window division is performed on each filtered sequence according to the window sequence number, and the window sequence is output. For the window sequence number , the effective value of the leakage current of the corresponding window can be calculated; in the embodiments of the present application, the first The reconstructed current sample value in a window is denoted as The window leakage current effective value is denoted as The unit is The window leakage current effective value can be written as

[0111]

[0112] The unit is The window leakage current effective value can be written as The unit is The window leakage current effective value can be written as

[0113]

[0114] Further, in order to quantify the stability degree of the window effective value sequence, a stability index can be calculated in the range of consecutive windows; in the embodiment of the present application, the leakage current effective value of each window can be calculated based on the window sequence to generate an effective value sequence, and the mean value and standard deviation of the effective value sequence can be calculated in the range of consecutive windows to generate a coefficient of variation as a stability index and write it into a structured record. The coefficient of variation is denoted as The mean value function is denoted as The standard deviation function is denoted as The window leakage current effective value can be written as

[0115]

[0116] The unit is and are the mean value and standard deviation of the window leakage current effective value, respectively. Exemplarily, the sampling resistance , the channel equivalent gain , the sampling frequency , the window point number , the window duration is ; in the steady voltage stage, the consecutive window number is required to satisfy the coefficient of variation not exceeding the stability threshold , and then the steady state result is output, so as to suppress the transient fluctuation misjudgment caused by strong interference.

[0117] At this point, step S4 forms a robust measurement system for strong electromagnetic environment through the digital measurement chain of "anti-aliasing filtering-window division-effective value measurement-stability constraint-mutation quantization", which provides reproducible window-level quantization input for subsequent calibration consistency and interlocking judgment.

[0118] In step S5, the core task is to establish an implementable calibration model for each channel and to perform calibration compensation on the window results, while constructing a channel consistency index and comparing it with a consistency threshold to explicitly constrain the effects of channel-level device bias, gain error and zero bias error on multi-station comparability within a controllable range.

[0119] Specifically, a calibration model can be established for each channel and calibration compensation can be performed on the window results, and further a channel consistency index can be calculated and compared with a consistency threshold. In the embodiments of the present application, the calibration process of each independent measurement loop can be completed before boosting: a standard AC current source injects a plurality of calibration point currents into each independent measurement loop, and after the current at each calibration point is stable, the effective values of the leakage currents of a plurality of windows are collected to form a calibration sample sequence.

[0120] In some embodiments of the present application, the calibration process can be performed on each independent measurement loop before boosting and a calibration sample sequence is generated, and further a calibration model is established for each channel based on the calibration sample sequence. The calibration model can be in linear or piecewise linear form; in linear calibration, the original measurement value is represented as , and the calibrated measurement value is represented as , which can use a proportional coefficient and a bias term to form a calibration relationship, and the calibrated measurement value is preferentially used when determining and displaying at the control end , while the original measurement value is retained for review and tracing.

[0121] Further, calibration compensation is performed at the window level to be consistent with the subsequent judgment criteria; in the embodiments of the present application, calibration compensation can be performed on the effective values of the leakage currents of each window based on the calibration model and a calibrated effective value sequence is generated. The channel consistency index is used to measure the deviation level of parallel channels under the same excitation condition, which can be calculated on the calibration points or the steady-state window set; in the embodiments of the present application, the deviation of each channel at each calibration point can be defined as the difference between the original measurement value of each channel and the channel mean value, and the maximum deviation and the root mean square deviation are calculated as components of the channel consistency index, and the channel consistency index is compared with a consistency threshold , so as to calculate the channel consistency index based on the calibrated effective value sequence and compare it with the consistency threshold. When the comparison does not satisfy the consistency condition, an event can be output and written into a record to drive maintenance or re-calibration, i.e., when the comparison does not satisfy the consistency condition, an inconsistency abnormal event flag is output and the inconsistency abnormal event flag is written into a structured record. Exemplarily, the set of calibration point currents can be , and it is required that both the maximum deviation and the root mean square deviation do not exceed a preset consistency threshold before allowing the boosting process to proceed.

[0122] 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.

[0123] 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.

[0124] 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.

[0125] It should be noted that the reliability of the communication link directly affects the integrity of the multi-channel discrete sampling sequence and the credibility of the determination; in some embodiments of the present application, the communication health state can be obtained based on the transmission statistics of the multi-channel discrete sampling sequence by the communication link, the communication health state can be obtained by the packet loss rate, the CRC check failure rate, the repeated frame proportion and the received signal strength statistics, and compared with the preset threshold to output whether the communication health meets the condition. At the same time, the channel determination result needs to be generated by comparing the measurement result with the threshold; in the embodiments of the present application, the channel determination result can be generated based on the comparison results of the leakage current effective value, the stability index and the channel consistency index with the determination threshold, wherein the stability index adopts the coefficient of variation The stability threshold is satisfied in a continuous window number The steady-state determination result is allowed to be output. The safety interlock depends on the combination of the ground continuity and the communication health state; further, the interlock state can be generated based on the ground continuity state and the communication health state, wherein the ground continuity state can be obtained by the ground resistance and the contact state detection from the common ground reference point to each workpiece grounding point, and compared with the upper limit to output whether the ground continuity meets the condition.

[0126] On this basis, the voltage reduction or cut-off needs to be immediately executed when the interlock is triggered; in the embodiments of the present application, the voltage reduction control instruction or the cut-off control instruction is generated and executed when the interlock state does not meet the interlock condition or the abnormal event marker meets the trigger condition. Among them, the abnormal event marker is used for classifying the trigger reason and supporting subsequent tracing; in the embodiments of the present application, the abnormal event marker includes the parameter abnormal event marker, the electric field condition abnormal event marker, the consistency abnormal event marker and the record abnormal event marker, and can carry the trigger channel index, the trigger window serial number, the window leakage current effective value And the mutation amplitude And other key evidence fields in the structured record.

[0127] It needs to be further explained that the test conclusion needs to be stored in a structured manner and has a verifiable consistency check chain; in the embodiment of the application, the channel determination result, the abnormal event mark and the version identification can be written into the structured record, and an incremental record serial number is assigned to the record when writing to ensure that the sequence is traceable, that is, the record serial number is assigned to this structured record. At the same time, the record digest of the structured record can be generated, and after being combined with the last record digest, the chain digest is obtained by hash calculation to realize the tamper-detectable consistency check across records; in the embodiment of the application, the record digest can be generated based on the structured record, and the record digest is further combined with the record digest of the last structured record to obtain a combined digest, and then the combined digest is executed by hash calculation to obtain a chain digest and write it into the structured record, thereby forming a digest chain in series according to the record serial number. The control end can output the record consistency state according to the chain digest, and output the event and execute the interlocking disposal when the consistency condition is not met; in the embodiment of the application, the chain digest can be written in the structured record and the record consistency state is output, and when the record consistency state does not meet the preset record consistency condition, the record abnormal event mark is output and pressure reduction or cut-off is executed.

[0128] So far, step S6 forms a comprehensive technical system considering determination robustness, disposal certainty and conclusion verifiability by closing the loop of "metering determination-communication and grounding safety state-interlocking disposal-structured storage-chain consistency check", providing traceable, reviewable and failure safety boundary output results for AC voltage withstand batch detection.

[0129] In summary, the method forms a robust AC leakage current representation by constructing equipotential boundaries and voltage equalizing electrodes at high voltage application positions, combining synchronous sampling of multiple channel independent measurement circuits, and combining anti-aliasing filtering and windowed effective value metering. At the same time, channel calibration compensation and consistency constraints are introduced, and the safety interlocking of grounding continuity state and communication health state is linked, realizing batch parallel, comparable and traceable detection of disc insulators in strong electromagnetic environment, which can significantly reduce the risk of false surge and misjudgment caused by corona and partial discharge, improve the comparability and determination stability between channels, and quickly reduce pressure or cut off when an abnormality occurs to improve test safety, thereby enhancing detection efficiency, data reliability and result reviewability.

[0130] It needs to be noted that although the embodiments of the application are described with reference to Figure 1 Although steps S1 to S6 are introduced and described in sequence, this does not mean that steps S1 to S6 must be executed in strict sequence. The embodiments of the application are described in sequence Figure 1The 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.

[0131] 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.

[0132] A complete implementation process may include the following steps:

[0133] 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.

[0134] 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 ; then performing integrity and consistency check on the parameter field and performing digest calculation on the parameter set to obtain the version identification , the version identification is used to anchor the parameter range and judgment range of the current test in the subsequent structured record.

[0135] Step three, establish the equipotential boundary and the equalization electrode and complete the work site wiring and the electric field condition verification. Specifically, the equipotential boundary is arranged at the high-voltage application position and the electric connection is closed, the equalization electrode is arranged outside the equipotential boundary and is electrically connected with the equipotential boundary, so that the equipotential boundary forms a consistent potential boundary for the high-voltage end of the 16 work sites; the high-voltage end of each disc-shaped insulator to be tested is connected to the equipotential boundary, and the low-voltage end of each disc-shaped insulator to be tested is connected to the corresponding independent measurement loop and returns to the common ground reference point; before voltage rising, the potential consistency detection is performed on different sampling points of the equipotential boundary to obtain the potential consistency state , and the surface continuity detection is performed on the equalization electrode to obtain the surface qualified state , when the potential consistency state or the surface qualified state does not meet the preset condition, an electric field condition abnormal event flag is output , and the voltage rising process is prohibited.

[0136] Step four, perform multi-channel calibration and establish a channel calibration model. Specifically, for each channel index , a set of calibration current effective values is injected into the corresponding independent measurement loop in sequence, the window leakage current effective value of each calibration point is collected to form a calibration sampling sequence; based on the calibration sampling sequence, a linear calibration model is established for each channel index , so that the calibrated measurement value and the original measurement value satisfy:

[0137]

[0138] wherein the linear proportionality coefficient and the zero offset coefficient are obtained by fitting the calibration sampling sequence; when the calibration residual or the cross-point consistency does not meet the allowed condition, an consistency abnormal event flag is output , and the corresponding channel index is marked as an unusable channel.

[0139] Step five, perform the withstand voltage process according to the voltage rising strategy and the voltage stabilizing strategy, and synchronously sample to form a multi-channel discrete sampling sequence. Specifically, the voltage rising control sequence and the voltage stabilizing control sequence are generated, and the AC withstand voltage effective value is applied according to the voltage rising time rise from zero to The AC voltage withstand voltage effective value is maintained within the allowable fluctuation band during the voltage stabilization time ; a shared sampling time base is established and a synchronous trigger signal is generated during the voltage rise and stabilization period, and the sampling of each independent measurement circuit is started and the sampling data is output when the synchronous trigger signal arrives; a channel identifier is assigned to each channel and a window serial number is assigned to the sampling data with a timestamp , the channel identifier, window serial number and timestamp Assemble a multi-channel discrete sampling sequence and write it to a structured record buffer area.

[0140] Step six, perform anti-aliasing filtering, windowing and stability calculation on the multi-channel discrete sampling sequence. Specifically, perform anti-aliasing filtering with a cutoff frequency on the discrete sampling sequence of each channel index and obtain a filtered sequence, and divide the filtered sequence into window sequences according to the number of window points ; calculate the window leakage current effective value for each window serial number , and the window leakage current effective value is used to represent the leakage current effective value of the channel index in the window serial number , and the calculation can be written as:

[0141]

[0142] Where the reconstructed current sample is obtained by converting the sampling resistance and channel gain corresponding to the channel index ; calculate the window duration to represent the time length covered by each window, and the window duration can be written as:

[0143]

[0144] Perform mean and standard deviation calculation on the window leakage current effective value in the continuous window range and generate a coefficient of variation as a stability indicator, and the coefficient of variation is used to represent the degree of steady state of the channel index in the continuous window, and the coefficient of variation can be written as:

[0145]

[0146] Step seven, perform calibration compensation and channel consistency check and generate consistency abnormal event flag. Specifically, based on the linear proportionality coefficient and zero offset coefficient to the window leakage current effective value , perform calibration compensation to obtain the calibration effective value , the calibration effective value is used for subsequent threshold determination and cross-channel comparison; select the window set that meets the coefficient of variation not more than the stability threshold in the steady voltage stage, based on the calibration effective value calculate the channel consistency index and compare it with the consistency threshold , when the channel consistency index exceeds the consistency threshold , output the consistency abnormal event flag and include the related channel index in the abnormal channel set.

[0147] Step eight, count the communication link and generate the communication health state, generate the interlocking state and perform the voltage reduction or cut-off. Specifically, the multi-channel discrete sampling sequence is transmitted through short-range radio frequency link, the link uses channel identification and sequence number addressing and uses time slot scheduling and CRC16 check to reduce error code and collision; the control end counts the communication health state based on the packet loss rate, CRC check failure rate and timeout rate , the communication health state is used to indicate whether the current communication meets the required data integrity condition for judgment; the control end combines the grounding continuity state and the communication health state to generate the interlocking state , when the interlocking state does not meet the interlocking condition, generate and execute the voltage reduction control instruction or cut-off control instruction, so that the AC voltage withstand voltage effective value falls to the safety voltage according to the preset voltage reduction slope and triggers the discharge process.

[0148] Step nine, output the channel judgment result and abnormal event flag based on threshold comparison and abnormal triggering condition. Specifically, compare the calibration effective value and the leakage current threshold for each channel index to generate the leakage overrun event flag , and compare the difference between the calibration effective values of adjacent windows to generate the mutation event flag , wherein the mutation event flag may be triggered by the calibration effective value difference exceeding the mutation threshold ; combined with the coefficient of variation channel consistency index ground continuity status communication health status output channel determination result abnormal event marker set abnormal event marker set at least including parameter abnormal event marker, electric field condition abnormal event marker, consistency abnormal event marker and record abnormal event marker, and in abnormal event marker set When the trigger condition is met, the voltage is reduced or cut off.

[0149] Step ten, write structured record and generate chain digest to output record consistency status. Specifically, write version identification channel determination result abnormal event marker set window number timestamp calibration effective value coefficient of variation channel consistency index Write structured record and assign record serial number Generate record digest for structured record Combine record digest with the last chain digest to get combined digest and perform hash calculation to get chain digest chain digest can be written as:

[0150]

[0151] where chain digest is used to output record consistency status When record consistency status does not meet the preset condition, output record abnormal event marker and perform voltage reduction or cut off.

[0152] Step eleven, complete voltage reduction, discharge and test end disposal and output test report. Specifically, after the steady voltage time ends or interlock disposal triggers, the effective value of AC withstand voltage is reduced to zero at a preset slope, and discharge and grounding maintenance are performed on the equipotential boundary and the low voltage end of the work position. After the residual charge is released, the work position is released and the abnormal channel index is marked and isolated for the corresponding disc insulator. The control end derives batch report based on structured record and gives traceable conclusion chain according to record serial number .

[0153] Through the complete implementation process described above, the method realizes Under the condition of power frequency AC withstand voltage, multi-channel parallel leakage current effective value measurement and stability constraint are realized by 16 independent measurement loops, false leakage current surge caused by uneven electric field and corona, local discharge is reduced by equipotential boundary and voltage equalizing electrode, the influence of channel gain error and zero offset error on batch comparability is suppressed by calibration model and consistency test, failure safety and rapid cutting are realized by driving interlocking disposal through communication health state and grounding continuity state, and conclusion traceability and verifiability are realized through structured recording of version identification and chain digest, so as to improve batch detection efficiency while considering test accuracy and test safety.

[0154] It should be understood that the step numbers identified in the form of "step one, step two" and the like in the above embodiments are only used to distinguish different steps, and do not limit that the steps must be executed in the order of the numbering, and the specific execution order of the steps can be adjusted according to the functional requirements and the internal logic in the actual application scene. The above step numbers should not be understood as a limitation on the implementation process of the embodiments of the present application.

[0155] As shown in Figure 2 The following is an embodiment of a disc-type insulator AC withstand voltage multi-channel leakage current detection system provided by the embodiments of the present disclosure, which belongs to the same inventive concept as the disc-type insulator AC withstand voltage multi-channel leakage current detection method described above. Details not described in the embodiment of the disc-type insulator AC withstand voltage multi-channel leakage current detection system can be referred to the embodiment of the disc-type insulator AC withstand voltage multi-channel leakage current detection method described above.

[0156] Based on the same concept, another embodiment of the present application provides a disc-type insulator AC withstand voltage multi-channel leakage current detection system, which comprises:

[0157] A parameter unit 1 is configured to set a parameter set and assign a version identification, the parameter set including an AC withstand voltage, an AC frequency, a boosting strategy, a voltage stabilizing strategy, a sampling parameter, a judgment threshold, and a consistency threshold;

[0158] A boundary unit 2 is configured to establish an equipotential boundary and a voltage equalizing electrode at a high voltage application position, and connect a high voltage end of each disc-type insulator to be tested to the equipotential boundary;

[0159] A sampling unit 3 is configured to connect a low voltage end of each disc-type insulator to be tested to a corresponding independent measurement loop and back to a common ground reference point, boost according to a boosting strategy and stabilize voltage according to a voltage stabilizing strategy, and generate a synchronous trigger signal based on a shared sampling time base during the boosting and voltage stabilizing periods, and synchronously sample each independent measurement loop to obtain a multi-channel discrete sampling sequence;

[0160] a metering unit 4 configured to perform anti-aliasing filtering and window division on the multi-channel discrete sampling sequence to obtain a leakage current effective value and a stability index of each window;

[0161] a calibration unit 5 configured to establish a calibration model for each channel and calibrate and compensate the window results, calculate a channel consistency index and compare the channel consistency index with a consistency threshold value;

[0162] an interlocking unit 6 configured to output a channel decision result and an abnormal event flag based on a decision threshold value, the leakage current effective value, the stability index, the channel consistency index, a ground continuity state, and a communication health state, and perform voltage reduction or disconnection when the ground continuity state or the communication health state does not meet a condition or the abnormal event flag meets a triggering condition;

[0163] a record storage unit 7 configured to write the channel decision result, the abnormal event flag, and a version identifier into a structured record.

[0164] In some embodiments of the present application, the record storage unit 7 is further configured to generate a record digest based on the structured record, combine the record digest with a record digest of a previous structured record to obtain a combined digest, perform a hash calculation on the combined digest to obtain a chain digest, write the chain digest into the structured record, and output a record consistency state, and the interlocking unit 6 is configured to output an abnormal event flag of the record and perform voltage reduction or disconnection when the record consistency state does not meet a preset record consistency condition.

[0165] The above disclosure is only preferred embodiments of the present application, but the present application is not limited thereto, any non-creative changes that can be thought of by those skilled in the art, and several improvements and refinements made without departing from the principles of the present application, should fall within the scope of protection of the present application.

Claims

1. A disc-type insulator AC voltage resistance multi-channel leakage current detection method, characterized in that, The method comprises the following steps: setting a parameter set and assigning a version identifier, the parameter set comprising AC withstand voltage, AC frequency, voltage boosting strategy, voltage stabilizing strategy, sampling parameter, determination threshold and consistency threshold; establishing equipotential boundary and voltage equalizing electrode at high voltage application position, connecting high voltage end of each disc type insulator to be tested to equipotential boundary, connecting low voltage end to corresponding independent measurement loop and returning to common ground reference point; boosting voltage according to voltage boosting strategy and stabilizing voltage according to voltage stabilizing strategy, synchronously sampling each independent measurement loop during voltage boosting and stabilizing to obtain multi-channel discrete sampling sequence; performing anti-aliasing filtering and window division on multi-channel discrete sampling sequence to obtain leakage current effective value and stability index of each window; establishing calibration model for each channel and compensating window result, calculating channel consistency index and comparing with consistency threshold; outputting channel determination result and abnormal event marker based on determination threshold, leakage current effective value, stability index, channel consistency index, ground continuity state and communication health degree state, executing voltage reduction or cutting off when ground continuity state or communication health degree state does not meet or abnormal event marker meets triggering condition, and writing channel determination result, abnormal event marker and version identifier into structured record.

2. The disc-type insulator AC voltage withstand multi-channel leakage current detection method of claim 1, wherein The step of setting parameter set and assigning version identifier comprises: receiving parameter input corresponding to AC withstand voltage, AC frequency, voltage boosting strategy, voltage stabilizing strategy, sampling parameter, determination threshold and consistency threshold and writing into parameter set; performing field integrity check and field consistency check on parameter set, when field integrity check and field consistency check meet condition, performing digest calculation on parameter set and assigning digest calculation result as version identifier; when field integrity check or field consistency check does not meet condition, outputting parameter abnormal event marker and writing parameter abnormal event marker into structured record.

3. The disc-type insulator AC voltage withstand multi-channel leakage current detection method of claim 2, wherein The step of establishing equipotential boundary and voltage equalizing electrode at high voltage application position comprises: arranging equipotential boundary at high voltage application position and completing electrical connection closure of equipotential boundary; arranging voltage equalizing electrode outside equipotential boundary and completing electrical connection between voltage equalizing electrode and equipotential boundary; performing potential consistency detection on different sampling points of equipotential boundary before voltage boosting and outputting potential consistency state, performing surface continuity detection on voltage equalizing electrode and outputting surface qualification state; when potential consistency state or surface qualification state does not meet preset condition, outputting electric field condition abnormal event marker and writing electric field condition abnormal event marker into structured record.

4. The disc-type insulator AC voltage withstand multi-channel leakage current detection method of claim 1, wherein The step of boosting voltage according to voltage boosting strategy and stabilizing voltage according to voltage stabilizing strategy, synchronously sampling each independent measurement loop during voltage boosting and stabilizing to obtain multi-channel discrete sampling sequence comprises: reading voltage boosting strategy and voltage stabilizing strategy and generating voltage boosting control sequence and voltage stabilizing control sequence, performing voltage boosting according to voltage boosting control sequence and performing voltage stabilizing according to voltage stabilizing control sequence; establishing shared sampling time base during voltage boosting and voltage stabilizing and generating synchronous trigger signal, starting sampling on each independent measurement loop and outputting sampling data when synchronous trigger signal arrives; Assigning a channel identifier to each independent measurement loop and assigning a window sequence number and a timestamp to the sampled data, assembling a multi-channel discrete sampling sequence based on the channel identifier, the window sequence number and the timestamp and writing into a structured record.

5. The disc-type insulator AC voltage withstand multi-channel leakage current detection method of claim 4, wherein The steps of performing anti-aliasing filtering and window division on the multi-channel discrete sampling sequence to obtain the leakage current effective value and stability index of each window, comprising: Performing anti-aliasing filtering on the multi-channel discrete sampling sequence according to the channel identifier respectively and outputting the filtered sequence, and performing window division on each filtered sequence according to the window sequence number and outputting the window sequence; Based on the window sequence, calculate the leakage current effective value of each window and generate the effective value sequence, perform mean and standard deviation calculation on the effective value sequence within the continuous window range and generate the coefficient of variation as the stability index and write into the structured record.

6. The disc-type insulator AC voltage withstand multi-channel leakage current detection method of claim 3, wherein The steps of establishing a calibration model for each channel and calibrating and compensating the window results, calculating the channel consistency index and comparing with the consistency threshold, comprising: Performing a calibration process on each independent measurement loop before boosting and generating a calibration sampling sequence, and establishing a calibration model for each channel based on the calibration sampling sequence; Based on the calibration model, perform calibration compensation on the leakage current effective value of each window and generate a calibrated effective value sequence, and based on the calibrated effective value sequence, calculate the channel consistency index and compare with the consistency threshold, if the comparison does not meet the consistency condition, output a consistency abnormal event marker and write it into the structured record.

7. The disc-type insulator AC voltage withstand multi-channel leakage current detection method of claim 6, wherein The steps of outputting the channel decision result and the abnormal event marker based on the decision threshold, the leakage current effective value, the stability index, the channel consistency index, the ground continuity state and the communication health state, and performing step-down or cutting off when the ground continuity state or the communication health state does not meet or the abnormal event marker meets the trigger condition, comprising: Statistically obtain the communication health state based on the transmission of the multi-channel discrete sampling sequence through the communication link; Generate the channel decision result based on the comparison results of the leakage current effective value, the stability index and the channel consistency index with the decision threshold; Based on the ground continuity state and the communication health state, generate the interlocking state, and generate and execute the step-down control instruction or the cutting-off control instruction when the interlocking state does not meet the interlocking condition or the abnormal event marker meets the trigger condition, the abnormal event marker including the parameter abnormal event marker, the electric field condition abnormal event marker, the consistency abnormal event marker and the record abnormal event marker.

8. The disc-type insulator AC voltage withstand multi-channel leakage current detection method of claim 7, wherein, The steps of writing the channel decision result, the abnormal event marker and the version identifier into the structured record, comprising: Write the channel decision result, the abnormal event marker and the version identifier into the structured record, and assign a record sequence number to this structured record; Generate a record digest based on the structured record, and combine the record digest 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 state, and when the record consistency state does not meet the preset record consistency condition, output the record abnormal event marker and perform step-down or cutting off.

9. A disc type insulator AC voltage resistance multi-channel leakage current detection system, characterized in that, Comprising: A parameter unit is configured to set a parameter set and assign a version identifier, the parameter set including AC withstand voltage, AC frequency, boosting strategy, stabilizing strategy, sampling parameter, determination threshold, and consistency threshold; A boundary unit is configured to establish an equipotential boundary and a voltage equalizing electrode at a high-voltage application position, and connect a high-voltage end of each disc-type insulator to be tested to the equipotential boundary; A sampling unit is configured to connect a low-voltage end of each disc-type insulator to be tested to a corresponding independent measurement loop and back to a common ground reference point, boost according to the boosting strategy and stabilize according to the stabilizing strategy, and generate a synchronous trigger signal based on a shared sampling time base during boosting and stabilizing, and synchronously sample each independent measurement loop to obtain a multi-channel discrete sampling sequence; A metering unit is configured to perform anti-aliasing filtering and window division on the multi-channel discrete sampling sequence to obtain a leakage current effective value and a stability index of each window; A calibration unit is configured to establish a calibration model for each channel, calibrate and compensate the window results, calculate a channel consistency index, and compare the channel consistency index with the consistency threshold; An interlocking unit is configured to output a channel determination result and an abnormal event flag based on the determination threshold, the leakage current effective value, the stability index, the channel consistency index, a ground continuity state, and a communication health state, and perform voltage reduction or disconnection when the ground continuity state or the communication health state does not meet the condition or the abnormal event flag meets the trigger condition; A storage unit is configured to write the channel determination result, the abnormal event flag, and the version identifier into a structured record.

10. The disc type insulator AC voltage withstanding multi-channel leakage current detection system according to claim 9, wherein The storage unit is further configured to generate a record digest based on the structured record, combine the record digest with a record digest of a previous structured record to obtain a combined digest, perform a hash calculation on the combined digest to obtain a chain digest, write the chain digest in the structured record, and output a record consistency state, and the interlocking unit is configured to output a record abnormal event flag and perform voltage reduction or disconnection when the record consistency state does not meet a preset record consistency condition.

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