A high-voltage cabinet breaking coil failure identification method and system

Abstract

This invention belongs to the field of high-voltage equipment fault detection technology, and discloses a method and system for identifying the failure of a high-voltage switchgear tripping coil. The method includes: applying a detection signal that does not trigger the tripping coil when the circuit breaker is in the tripping position; forming a static detection result based on the collected data and determining whether to generate current coil state parameters; selecting similar normal samples from historical valid normal samples based on the current coil state parameters to generate a predicted tripping range; collecting actual tripping process data and extracting response parameters for each stage; comparing the response parameters of each stage with the corresponding predicted range based on whether the predicted tripping range has been generated, or determining whether a response has been formed at each stage, and determining the anomaly attribution level by level; generating a tripping coil failure identification result based on the anomaly attribution and the static detection result. This invention can distinguish between anomalies in command output, connection transmission, tripping coil, and operating mechanism, improving the accuracy of failure identification.

Description

Technical Field

[0001] This invention relates to the field of high-voltage equipment fault detection technology, and more specifically, to a method and system for identifying the failure of a high-voltage switchgear disconnecting coil. Background Technology

[0002] The disconnecting coil in the high-voltage switchgear is used to generate electromagnetic driving force after receiving a disconnection command, and to switch the circuit breaker from the closed position to the disconnected position through the operating mechanism. Any abnormality in any part of the disconnecting coil, disconnection control circuit and operating mechanism may cause the circuit breaker to fail to disconnect according to the disconnection command.

[0003] Existing technologies typically determine the breaking status by detecting the conduction state of the breaking coil, the coil resistance, or the coil current and position feedback during the actual breaking process. There is a lack of correspondence between the static detection results and the actual breaking response, and the actual breaking response is often judged using a fixed threshold, which fails to fully consider the influence of the current state of the breaking coil, the temperature of the coil installation area, and the changes in the breaking control power supply voltage on the response parameters.

[0004] When an anomaly occurs in the preceding stage of the command output section, connection transmission section, disconnecting coil body, electromagnetic drive process, or operating mechanism, the subsequent stage may also exhibit response delay or missing response. Existing technologies make it difficult to distinguish the attribution of an anomaly based on the sequential relationship of responses at each stage, and easily attribute connection transmission anomalies or operating mechanism anomalies directly to the disconnecting coil body. Therefore, how to correlate the static state of the disconnecting coil with the stage responses in the actual disconnecting process, and how to distinguish the stage where the anomaly is located step by step, is a technical problem that needs to be solved in this field.

[0005] In view of this, the present invention proposes a method and system for identifying the failure of the high-voltage switchgear disconnecting coil to solve the above problems. Summary of the Invention

[0006] To address the shortcomings of existing technologies, the present invention aims to provide a method and system for identifying failures of high-voltage switchgear tripping coils. This method acquires static detection results of the tripping coil when the circuit breaker is in the tripping position, matches historical valid normal samples with the current coil state parameters to generate a predicted tripping range, and then, by combining the comparison results of response parameters at each stage of the actual tripping process with the corresponding predicted range, or the formation of responses at each stage, determines the attribution of the anomaly step by step. This achieves the goal of distinguishing between command output, connection transmission, tripping coil body, and operating mechanism anomalies, and improving the accuracy of failure identification.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] In a first aspect, the present invention provides a method for identifying the failure of a high-voltage switchgear disconnecting coil, comprising:

[0009] When the circuit breaker is in the open position, a detection signal that does not trigger the action of the open coil is applied to the open control circuit. Based on the collected instructions, the section voltage, open coil terminal voltage, detection current and coil installation area temperature are output to form static detection results. Based on the static detection results, it is determined whether to generate the current coil state parameters.

[0010] When the current coil state parameters are generated and the current coil state parameters are within the parameter coverage range of historical valid normal samples, a similar normal sample is selected from the historical valid normal samples, and the current segmentation prediction range is generated based on the response parameters of each stage of the selected sample; when the current coil state parameters are not generated or they exceed the parameter coverage range, the corresponding static detection results are retained.

[0011] During the actual disconnection process, the disconnection command signal, command output section voltage, disconnection coil terminal voltage, disconnection coil current, and circuit breaker mechanical position are collected, and response parameters for each stage corresponding to command output, connection transmission, coil electrical, electromagnetic drive, and mechanism response are extracted.

[0012] Based on whether the predicted range of this segmentation is generated, the response parameters of each stage are compared with the corresponding predicted range or it is determined whether the response of each stage is formed, and the anomaly attribution is determined step by step according to the order of the responses of each stage.

[0013] Based on the anomaly attribution and static detection results, a broken coil failure identification result is generated.

[0014] Furthermore, a conduction detection signal and a parameter detection signal are sequentially applied to the disconnection control circuit. When a detection voltage is formed at the disconnection coil terminal and the detection current reaches the conduction determination threshold, it is determined that the disconnection coil is in a conducting state, and the parameter detection stable section is determined based on the change in detection current after the parameter detection signal is applied.

[0015] Furthermore, when the disconnecting coil is in the conducting state and a stable parameter detection segment is formed, the equivalent resistance of the current coil is determined based on the voltage at the disconnecting coil terminal and the detection current within the stable parameter detection segment. The equivalent resistance of the current coil is then temperature-corrected based on the temperature of the coil installation area to obtain a temperature-corrected resistance. The equivalent time parameter of the coil is determined based on the rise process of the detection current after the parameter detection signal is applied. The equivalent resistance of the connection transmission segment is determined based on the voltage of the command output segment, the voltage at the disconnecting coil terminal, and the detection current. The current coil state parameters include at least the temperature-corrected resistance, the equivalent time parameter of the coil, and the equivalent resistance of the connection transmission segment. The connection transmission segment includes the connection loop between the disconnecting command output component and the disconnecting coil input terminal, and between the disconnecting coil return terminal and the disconnecting control power supply return terminal.

[0016] Furthermore, when the disconnected coil is not conducting, evidence of an impending abnormality of coil non-conduction is formed and the current coil state parameters are not generated; when the disconnected coil is in a conducting state but a stable parameter detection segment has not been formed, the current coil state parameters are not generated and the corresponding static detection results are retained.

[0017] Furthermore, each historical valid normal sample includes the coil state parameters under normal conditions and the corresponding response parameters at each stage. The sample difference value is determined based on the parameter differences between the current coil state parameters and the coil state parameters in each historical valid normal sample.

[0018] Furthermore, multiple similar normal samples are selected in ascending order of sample difference values. Corresponding prediction ranges are generated based on the value range of response parameters at each stage in the multiple similar normal samples. The prediction ranges are then combined to form the current segmentation prediction range.

[0019] Furthermore, the response parameters for each stage include command output response time, connection transmission response time, coil current establishment time, current rise parameter, electromagnetic drive characteristic appearance time, mechanism response time, and disconnection completion time. The command output response time is determined based on the time when the disconnection command signal appears and the time when the command output segment voltage is established. The connection transmission response time is determined based on the time when the command output segment voltage is established and the time when the disconnection coil terminal voltage is established. The coil current establishment time is determined based on the time when the disconnection coil terminal voltage is established and the time when the disconnection coil current is established.

[0020] Furthermore, the timing of the electromagnetic drive characteristic occurrence is determined based on the change in the breaking coil current; the current rise parameter is determined based on the current change and time difference between the coil current establishment time and the electromagnetic drive characteristic occurrence time; the electromagnetic drive characteristic occurrence time is determined based on the time difference between the coil current establishment time and the electromagnetic drive characteristic occurrence time; the mechanism response time is determined based on the timing of the electromagnetic drive characteristic occurrence and the moment when the circuit breaker's mechanical position changes to the breaking position; and the breaking completion time is determined based on the timing of the breaking command signal occurrence and the moment when the circuit breaker's mechanical position changes to the breaking position.

[0021] Furthermore, when the current segmentation prediction range has been generated, the response parameters of each stage are compared with the corresponding prediction range. Based on the comparison results, the corresponding stage's normal result, deviation below the lower limit of the prediction range, deviation above the upper limit of the prediction range, or response missing result are generated and combined to form the actual segmentation deviation result. When the current segmentation prediction range has not been generated, the actual segmentation response result is generated based on whether the response of each stage has been formed.

[0022] Furthermore, based on the actual breaking deviation result or the actual breaking response result, the anomaly attribution is determined step by step in the order of command output response, connection transmission response, coil electrical response, electromagnetic drive response and mechanism response; when the response of the previous stage is missing or is determined to be abnormal, the failure of the breaking coil body is not directly determined based on the abnormal response of the next stage, and the judgment result of the previous stage is used as the basis for the judgment of the subsequent anomaly attribution.

[0023] Furthermore, the current coil status parameters include the temperature correction resistor, and the normal parameter range is established based on the coil status parameters in historical valid normal samples; if no command output response is generated, the command output is determined to be abnormal; if the command output response is not determined to be abnormal and no connection transmission response is generated, the connection transmission is determined to be abnormal; if the voltage at the disconnecting coil terminal has been established but no disconnecting coil current has been generated, and any of the following conditions are met, the disconnecting coil open-circuit failure is determined: the static detection result includes evidence of a pre-existing abnormality such as coil non-conduction; the temperature correction resistor is greater than the upper limit of the temperature correction resistor in the normal parameter range.

[0024] Furthermore, the normal parameter range is established based on the coil state parameters in historical valid normal samples. When the current interruption prediction range has been generated, if the command output response, connection transmission response, and coil electrical response are all normal, and the temperature correction resistance, coil equivalent time parameter, and connection transmission section equivalent resistance in the current coil state parameters are all within their respective normal parameter ranges, and no electromagnetic drive response is formed, the interruption coil electromagnetic drive is determined to be abnormal. When the electromagnetic drive characteristic appears within the corresponding prediction range, but the circuit breaker mechanical position does not change to the interruption position within the interruption completion time prediction range, the operating mechanism is determined to be abnormal.

[0025] Furthermore, when generating the current breakage prediction range, the coil installation area temperature and breakage control power supply voltage during the static detection period are associated with the current breakage prediction range; the coil installation area temperature and breakage control power supply voltage during the actual breakage process are compared with the coil installation area temperature and breakage control power supply voltage associated with the current breakage prediction range, respectively. When the difference of any parameter is greater than the allowable difference for the corresponding operating condition, the anomaly is not determined based on the current breakage prediction range, and an operating condition mismatch result is generated.

[0026] Secondly, the present invention provides a high-voltage switchgear disconnecting coil failure identification system, wherein implementing the high-voltage switchgear disconnecting coil failure identification method includes:

[0027] The static detection module is used to apply a detection signal to the tripping control circuit without triggering the tripping coil when the circuit breaker is in the tripping position. Based on the collected instructions, it outputs the section voltage, tripping coil terminal voltage, detection current and coil installation area temperature to form static detection results, and determines whether to generate current coil state parameters based on the static detection results.

[0028] The range generation module is used to select similar normal samples from the historical valid normal samples when the current coil state parameters are generated and the current coil state parameters are within the parameter coverage range of historical valid normal samples, and generate the current segmentation prediction range based on the response parameters of each stage of the selected samples; when the current coil state parameters are not generated or they exceed the parameter coverage range, the corresponding static detection results are retained.

[0029] The response extraction module is used to collect the breaking command signal, the voltage of the command output section, the voltage of the breaking coil terminal, the breaking coil current and the mechanical position of the circuit breaker during the actual breaking process, and to extract the response parameters of each stage corresponding to the command output, connection transmission, coil electrical, electromagnetic drive and mechanism response.

[0030] The anomaly attribution module is used to compare the response parameters of each stage with the corresponding prediction range based on whether the current segmentation prediction range has been generated, or to determine whether the response of each stage has been formed, and to determine the anomaly attribution level by level according to the order of the responses of each stage.

[0031] The result generation module is used to generate the failure identification result of the broken coil based on the anomaly attribution and static detection results.

[0032] The technical effects and advantages of the high-voltage switchgear disconnecting coil failure identification method and system proposed in this invention are as follows:

[0033] First, the present invention applies a detection signal that does not trigger the tripping coil when the circuit breaker is in the tripping position, and forms a static detection result based on the detected voltage, current and temperature data. This allows the current status information of the tripping coil and the connected transmission section to be obtained without performing an actual tripping action, providing a static detection basis for judging abnormalities during the actual tripping process.

[0034] Second, the present invention selects similar normal samples from historical valid normal samples by using the current coil state parameters, and generates the current break prediction range based on the response parameters of each stage of the similar normal samples, so that the comparison benchmark of the actual break response corresponds to the current coil state, reducing the deviation generated when using a unified fixed range to judge different coil states.

[0035] Third, based on the comparison results of the response parameters at each stage with the corresponding prediction range or the formation of the response at each stage, the present invention determines the attribution of the anomaly step by step according to the order of command output, connection transmission, coil electrical, electromagnetic drive and mechanism response. This can distinguish the subsequent response loss caused by the anomaly at the previous stage and reduce the possibility of directly attributing the connection transmission anomaly or the operating mechanism anomaly to the disconnecting coil body. Attached Figure Description

[0036] Figure 1 This is a flowchart of the high-voltage switchgear disconnecting coil failure identification method in Embodiment 1 of the present invention;

[0037] Figure 2 This is a flowchart of static detection and current coil state parameter generation in Embodiment 1 of the present invention;

[0038] Figure 3 This is a flowchart of the selection of similar normal samples and the generation of the predicted range for this segmentation in Embodiment 1 of the present invention. Detailed Implementation

[0039] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0040] Example 1:

[0041] See Figure 1 As shown, this embodiment provides a method for identifying the failure of a high-voltage switchgear disconnecting coil, including:

[0042] Obtain the disconnection control circuit connection information of the high-voltage switchgear under test. Based on the connection sequence between the disconnection command output component, connection interface, connection terminal, connection wire and disconnection coil in the disconnection control circuit, divide the disconnection control circuit into command output section, connection transmission section and coil load section.

[0043] The instruction output section is the circuit section corresponding to the disconnection instruction output component and its output contacts; the connection transmission section is the circuit section corresponding to the connection interface, connection terminal and connection wire between the disconnection instruction output component and the disconnection coil input terminal and between the disconnection coil return terminal and the disconnection control power supply return terminal; the coil load section is the circuit section corresponding to the disconnection coil winding body.

[0044] The voltage detection endpoints of the command output section, the voltage detection endpoints of the disconnecting coil, and the current detection position of the disconnecting coil are determined. The voltage detection endpoint of the command output section is used to obtain the voltage between the power supply terminal of the disconnecting command output side and the return terminal of the disconnecting control power supply. The voltage detection endpoint of the disconnecting coil is used to obtain the voltage between the input terminal of the disconnecting coil and the return terminal of the disconnecting coil. The current detection position of the disconnecting coil is set in the series path of the disconnecting coil winding.

[0045] The system acquires the following signals: disconnection command signal, circuit breaker mechanical position detection signal, circuit breaker position feedback, disconnection control power supply voltage signal, disconnection control power supply type, primary main circuit isolation status, high-voltage cabinet interlocking status, and coil installation area temperature signal. The disconnection command signal is used to trigger actual disconnection monitoring; the circuit breaker mechanical position detection signal is used to determine whether the circuit breaker has actually completed disconnection; the circuit breaker position feedback is used to verify whether the auxiliary position feedback is consistent with the circuit breaker mechanical position; the disconnection control power supply voltage signal is used to filter historical valid normal samples that match the operating conditions and to determine whether the predicted operating conditions are consistent with the actual disconnection operating conditions; the disconnection control power supply type is used to distinguish between AC and DC disconnection control power supplies; the primary main circuit isolation status and high-voltage cabinet interlocking status are used to determine whether static detection is allowed; and the coil installation area temperature signal is used to perform temperature correction on the equivalent resistance of the disconnection coil.

[0046] The mechanical position detection signal of the circuit breaker is obtained through the stroke detection component corresponding to the main shaft, transmission component or breaking mechanism of the circuit breaker. The position feedback of the circuit breaker is obtained through the open position auxiliary contact and the closed position auxiliary contact of the circuit breaker, so that the mechanical position of the circuit breaker and the position feedback of the circuit breaker can be judged independently.

[0047] Establish the association between the instruction output section, the connection transmission section, and the coil load section and the corresponding voltage detection endpoint, current detection position, and status signal to form a break detection configuration result. The break detection configuration result serves as the common configuration basis for detection status identification, current coil status parameter extraction, break prediction range generation, and actual break deviation judgment.

[0048] Based on the disconnection detection configuration results, read the disconnection command signal, circuit breaker mechanical position detection signal, primary main circuit isolation status and high-voltage cabinet interlocking status, and determine the current detection status in the order of actual disconnection monitoring taking precedence over static detection. The detection status includes static detection status, actual disconnection monitoring status and detection prohibited status.

[0049] When the disconnection command signal does not appear, the circuit breaker mechanical position detection signal indicates that the circuit breaker is in the disconnected position, the primary main circuit isolation status indicates that the circuit breaker is electrically isolated from the high-voltage live parts, and the high-voltage cabinet interlock status indicates that testing is allowed, the current testing status is determined as the static testing status.

[0050] When a disconnection command signal is detected and the circuit breaker mechanical position detection signal indicates that the circuit breaker is in the closed position, the current detection state is determined as the actual disconnection monitoring state, and the time when the disconnection command signal appears is used as the unified trigger time for the actual disconnection data.

[0051] When a disconnection command signal appears during static testing, the output of the static testing signal is immediately stopped and the independent testing branch is disconnected through hardware priority control. The actual disconnection power supply path remains in a normal and usable state. Since the circuit breaker is already in the disconnected position during static testing, the disconnection command is not identified as an actual disconnection event, and the current static testing is terminated. Only when the circuit breaker mechanical position detection signal indicates that the circuit breaker is in the closed position will the actual disconnection monitoring state be triggered.

[0052] When a disconnection command signal is detected but the circuit breaker mechanical position detection signal does not indicate that the circuit breaker is in the closed position, the circuit breaker mechanical position detection signal does not correspond to the isolation status of the primary main circuit, the high-voltage switchgear interlock status indicates that detection is not allowed, or the independent detection branch is not in a safe exit state, the current detection status will be determined as a prohibited detection state.

[0053] Based on the above judgment, a detection status identification result is formed. The detection status identification result triggers static detection of the disconnecting coil in static detection state, triggers actual disconnection response acquisition in actual disconnection monitoring state, and keeps the independent detection branch disconnected in the prohibited detection state.

[0054] See Figure 2 As shown, when the detection status identification result is a static detection status, the conduction detection signal and parameter detection signal are sequentially applied from the voltage detection endpoint of the command output section to the disconnection control circuit through an independent detection branch, so that the detection current flows sequentially through the connection transmission section and the coil load section. At the same time, the voltage of the command output section, the voltage of the disconnection coil terminal, the detection current of the disconnection coil, and the temperature of the coil installation area are collected.

[0055] When a stable parameter detection segment is formed, the average value of each effective temperature sample within the stable parameter detection segment is determined as the coil installation area temperature corresponding to this static test. For the disconnection control power supply voltage, when the disconnection control power supply type is DC disconnection control power supply, the average value of each effective power supply voltage sample within the stable parameter detection segment is determined as the disconnection control power supply voltage corresponding to this static test; when the disconnection control power supply type is AC disconnection control power supply, the effective value of each effective power supply voltage sample within the stable parameter detection segment is determined as the disconnection control power supply voltage corresponding to this static test. The obtained coil installation area temperature and disconnection control power supply voltage are associated with and stored in relation to the temperature correction resistor, coil equivalent time parameter, and equivalent resistance of the connection transmission section formed in this static test.

[0056] The independent detection branch includes an electrical isolation component, a current limiting component, and a detection switching component. The electrical isolation component prevents the detection signal from entering the disconnection command output component in reverse. The current limiting component limits the detection current flowing through the disconnection coil. The detection switching component only controls the connection and disconnection between the independent detection branch and the disconnection control circuit. The actual disconnection power supply path remains in a normal and usable state. When the disconnection command signal appears, the detection switching component forcibly disconnects the independent detection branch according to the hardware priority relationship.

[0057] The independent detection branch applies a unidirectional controlled detection signal to the disconnection control circuit, causing the coil current to rise unidirectionally during the static detection period. The static parameter calculation is not affected by whether the actual disconnection control power supply is AC or DC.

[0058] The duration of the continuity detection signal is shorter than the duration of the parameter detection signal. The continuity detection signal is used to determine whether a continuous current path is formed in the coil load section, while the parameter detection signal is used to obtain the change process of the interrupted coil detection current from the beginning of its rise to its tendency to stabilize.

[0059] The maximum current values ​​of both the continuity detection signal and the parameter detection signal are less than the minimum operating current of the breaking coil, and the cumulative input energy is less than the minimum operating energy of the breaking coil. The minimum operating current and minimum operating energy are determined based on the technical parameters of the breaking coil and the results of the operation test during the installation and commissioning phase, and are multiplied by a safety factor of less than 1 to obtain the upper limit of the detection current and the upper limit of the detection energy.

[0060] The formula for calculating the cumulative input energy of the detected signal is:

[0061] ;

[0062] in, This represents the cumulative input energy of the detected signal. Indicates the first The voltage at the disconnecting coil terminal at each sampling time, Indicates the first The detected current at each sampling time, Indicates the sampling period. This indicates the number of sampling points during the duration of the detection signal.

[0063] When a continuity detection signal is applied, if a detection voltage is formed at the disconnected coil terminal and the detection current at a consecutive preset number of sampling points is greater than the continuity judgment threshold, the coil continuity state is determined to be continuous. If a detection voltage is formed at the disconnected coil terminal but the detection current does not reach the continuity judgment threshold, a pre-abnormal evidence of coil non-conduction is generated, parameter detection is not performed, and the current coil state parameters are not generated.

[0064] The conduction determination threshold is set between the upper limit of the noise of the current detection channel and the minimum detection current of the normal breaking coil. The number of continuous confirmation sampling points is determined based on the sampling period and the shortest duration of the normal detection current during the installation and commissioning phase.

[0065] When the coil is in the conducting state, a continuous stable detection window is set after the parameter detection signal. When the difference between the maximum and minimum values ​​of the detected current within the continuous stable detection window is less than or equal to the stability judgment amplitude, the continuous stable detection window is determined as the parameter detection stable segment.

[0066] The length of the continuous stable detection window is determined based on the sampling period and the shortest duration of the stable segment of the normal detection signal during the installation and commissioning phase. The stability judgment amplitude is determined based on the maximum current fluctuation amplitude of the stable segment of the normal detection signal and the maximum value in the measurement resolution of the current detection channel.

[0067] The equivalent resistance of the current coil is determined based on the average voltage and average detection current at the disconnected coil terminals in the stable section of the parameter detection. The calculation formula is as follows:

[0068] ;

[0069] in, This indicates the current equivalent resistance of the coil. This represents the average voltage at the disconnected coil terminals during the stable phase of parameter detection. This represents the average detection current during the stable phase of parameter detection.

[0070] The equivalent resistance of the current coil is corrected for temperature based on the temperature of the coil installation area, the reference temperature, and the temperature coefficient of resistance of the broken coil conductor. The calculation formula is as follows:

[0071] ;

[0072] in, Indicates temperature-corrected resistor. This represents the temperature coefficient of resistance of the conductor in the disconnected coil. Indicates the temperature of the coil mounting area. Indicates the reference temperature.

[0073] Based on the change in the detection current after the parameter detection signal is applied, the moment when the detection current first reaches the conduction judgment threshold is determined as the start time of current rise, the start time of the parameter detection stable segment is determined as the end time of current rise, and the time difference between the start time and the end time of current rise is determined as the coil equivalent time parameter. When the detection current does not reach the conduction judgment threshold or does not form a parameter detection stable segment, the current static detection is determined as invalid and no current coil state parameter is generated.

[0074] Based on the difference between the average voltage of the command output section and the average voltage of the disconnecting coil terminal, and the average detection current in the parameter detection stabilization section, the equivalent resistance of the connection transmission section is determined using the following formula:

[0075] ;

[0076] in, Indicates the equivalent resistance of the connected transmission segment. This indicates the average voltage of the command output section within the parameter detection stable segment. This represents the average voltage across the corresponding disconnecting coil terminals. This represents the corresponding average detection current.

[0077] When the average detected current is greater than or equal to the allowable current calculated by the resistor, the equivalent resistance of the connected transmission section is calculated; when the average detected current is less than the allowable current calculated by the resistor, the current static detection is determined to be invalid, the current coil state parameters and the current break prediction range are not generated, and the reason for the invalidity of the current static detection parameters is retained; the allowable current calculated by the resistor is set to a value greater than the upper limit of the current detection channel noise and the measurement resolution.

[0078] Only when the coil conduction state, temperature correction resistor, coil equivalent time parameter, and equivalent resistance of the connection transmission section are all valid, the above parameters are combined with the coil installation area temperature and disconnection control power supply voltage to form the current coil state parameters. When any parameter is invalid, or the detection signal exceeds the detection current limit or detection energy limit, the current static detection is terminated and the current coil state parameters and the current disconnection prediction range are not generated, but the detection data that caused the parameters to be invalid is retained. When an actual disconnection occurs subsequently, based on the retained static detection results, prior abnormal evidence, and actual disconnection response, the corresponding abnormal attribution judgment is executed in the order of command output section, connection transmission section, coil load section, electromagnetic drive process, operating mechanism, and position feedback loop. When the already formed static detection results, prior abnormal evidence, and actual disconnection response cannot form a unique abnormal attribution, a coil parameter abnormality pending verification result is generated.

[0079] During the installation and commissioning phase, multiple static tests and actual breaking tests are performed after the breaking coil, breaking control circuit, operating mechanism, circuit breaker mechanical position detection, and circuit breaker position feedback are all confirmed to be normal. Based on the data from multiple static tests, the minimum and maximum values ​​of the temperature correction resistor, coil equivalent time parameter, and equivalent resistance of the connection transmission section are determined. Allowable deviations determined by measurement error and normal fluctuation range are added on both sides of the corresponding minimum and maximum values ​​to form the initial normal parameter range.

[0080] The static test data and actual segmentation data confirmed to be normal during the installation and commissioning phase are combined to form an initial historical valid normal sample. The number of the initial historical valid normal samples is greater than or equal to 2, and the static test data in each initial historical valid normal sample is associated with the actual segmentation data corresponding to the same test.

[0081] Each historical valid normal sample includes coil installation area temperature, disconnection control power supply voltage, temperature correction resistor, coil equivalent time parameter, connection transmission section equivalent resistance, command output response time, connection transmission response time, coil current settling time, current rise parameter, electromagnetic drive characteristic appearance time, mechanism response time, and disconnection completion time.

[0082] For the temperature correction resistor, coil equivalent time parameter, and connection transmission section equivalent resistance in the historical valid normal samples, the corresponding parameter values ​​in all current historical valid normal samples are read respectively. The minimum value of the corresponding parameter is determined as the lower limit of the parameter coverage range, and the maximum value of the corresponding parameter is determined as the upper limit of the parameter coverage range. The parameter coverage ranges corresponding to the three parameters together constitute the parameter coverage range of the historical valid normal samples. In this embodiment, the current coil state parameter being within the parameter coverage range of the historical valid normal samples means that the temperature correction resistor, coil equivalent time parameter, and connection transmission section equivalent resistance in the current coil state parameter are all within their respective parameter coverage ranges. The parameter coverage range is used to determine whether to perform the selection of similar normal samples, and the normal parameter range is used to determine whether the corresponding static parameter is in a normal state.

[0083] The minimum and maximum values ​​of command output response time, connection transmission response time, coil current establishment time, current rise parameter, electromagnetic drive characteristic appearance time, mechanism response time and break-off completion time are determined respectively in the initial historical valid normal samples. Allowable deviations determined by measurement error and normal sample fluctuation amplitude are added on both sides of the corresponding minimum and maximum values ​​to form the initial prediction range.

[0084] See Figure 3 As shown, when valid current coil state parameters are generated, historical valid normal samples are read based on the current coil state parameters. The differences between the current temperature correction resistor, coil equivalent time parameter, equivalent resistance of the connection transmission section, coil installation area temperature, and disconnection control power supply voltage and the corresponding parameters in each historical valid normal sample are calculated. The sample difference value of each historical valid normal sample is determined based on the normalized parameter difference value.

[0085] No. The formula for calculating the sample difference of a historical valid normal sample is:

[0086] ;

[0087] in, Indicates the first The sample difference values ​​of a historical valid normal sample. , , , and These represent the current temperature correction resistor, coil equivalent time parameter, equivalent resistance of the connected transmission section, temperature of the coil mounting area, and disconnection control power supply voltage, respectively, with subscripts. The parameter represents the first The corresponding parameters in a historical valid normal sample , , , and These represent the difference between the maximum and minimum values ​​of the corresponding parameters in the historical valid normal samples.

[0088] When the maximum and minimum values ​​of any parameter in the historical valid normal samples are equal, the measurement resolution of the corresponding parameter is used as the normalization scale for that parameter to avoid the normalization denominator being zero.

[0089] A preset number of similar normal samples are selected in ascending order of sample difference values. The preset number is a fixed integer greater than or equal to 2 set during the installation and debugging phase, and less than or equal to the initial number of valid historical normal samples.

[0090] When the number of available historical valid normal samples is greater than or equal to 2 and less than the preset number, all available historical valid normal samples are selected; when the number of available historical valid normal samples is less than 2, the initial prediction range formed during the installation and debugging phase is adopted.

[0091] Based on the command output response time, connection transmission response time, coil current settling time, current rise parameter, and electromagnetic drive characteristic appearance time in similar normal samples, determine the minimum and maximum values ​​of the corresponding parameters. Add allowable deviations determined by measurement error and fluctuation amplitude of normal samples on both sides of the minimum and maximum values ​​to form the prediction range of command output response time, connection transmission response time, coil current settling time, current rise parameter, and electromagnetic drive characteristic appearance time.

[0092] The minimum and maximum values ​​of the corresponding parameters are determined based on the mechanism response time and the break-off completion time in similar normal samples, and corresponding allowable deviations are added on both sides of the minimum and maximum values ​​to form the prediction range of mechanism response time and break-off completion time.

[0093] The mechanism response time is the time from the moment the electromagnetic drive feature appears to the moment the circuit breaker's mechanical position changes to the disconnected position, and the disconnection completion time is the time from the moment the disconnection command signal appears to the moment the circuit breaker's mechanical position changes to the disconnected position.

[0094] When the temperature correction resistor, coil equivalent time parameter, and connection transmission section equivalent resistance in the current coil state parameters are all within the coverage range of the corresponding parameters of the historical valid normal samples, the command output response time prediction range, connection transmission response time prediction range, coil current establishment time prediction range, current rise prediction range, electromagnetic drive characteristic appearance time prediction range, mechanism response time prediction range, and break completion time prediction range are combined to form the break prediction range for this time.

[0095] When the temperature correction resistor, coil equivalent time parameter, or equivalent resistance of the connection transmission section in the current coil status parameters exceeds the coverage range of the corresponding parameters in the historical valid normal samples, the current break prediction range will not be generated, and the current coil status parameters that exceed the coverage range will be identified as preliminary abnormal evidence for failure identification.

[0096] Establish a correspondence between the predicted breakage range and the first actual breakage event after the completion of this static test, and associate the coil installation area temperature, breakage control power supply voltage and current coil status parameters during this static test with the predicted breakage range. When static test is performed again before actual breakage, the breakage coil is replaced or the connection transmission section is repaired, the aforementioned predicted breakage range will become invalid.

[0097] When the detection status identification result is the actual disconnection monitoring status, the moment when the disconnection command signal changes from the non-occurring state to the occurrence state is taken as the unified trigger time. The same sampling clock is used to synchronously collect the command output section voltage, disconnection coil terminal voltage, disconnection coil current, circuit breaker mechanical position detection signal, circuit breaker position feedback, coil installation area temperature and disconnection control power supply voltage.

[0098] For the coil installation area temperature collected during the actual interruption process, the average value of each valid temperature sample during the actual interruption data collection period is determined as the coil installation area temperature corresponding to this actual interruption. For the interruption control power supply voltage collected during the actual interruption process, when the interruption control power supply type is DC interruption control power supply, the average value of each valid power supply voltage sample during the actual interruption data collection period is determined as the interruption control power supply voltage corresponding to this actual interruption. When the interruption control power supply type is AC interruption control power supply, the effective value of each valid power supply voltage sample during the actual interruption data collection period is determined as the interruption control power supply voltage corresponding to this actual interruption. Subsequent consistency judgment is made by comparing the above-mentioned coil installation area temperature and interruption control power supply voltage with the corresponding parameters during the static detection period associated with the interruption prediction range.

[0099] The validity of the synchronously acquired voltage and current data is checked. Sampling points that exceed the upper and lower limits of the acquisition range or are marked as invalid by the acquisition device are identified as abnormal sampling points. The actual voltage and current jumps during the actual disconnection process are not directly identified as abnormal sampling points. The average of the valid sampled values ​​before and after the abnormal sampling point is used to replace the abnormal sampling point.

[0100] When the disconnection control power supply type is DC disconnection control power supply, the effective voltage and current sampled values ​​are low-pass filtered; when the disconnection control power supply type is AC disconnection control power supply, the absolute value envelope of the effective voltage and current sampled values ​​is extracted first, and then the obtained voltage envelope and current envelope are low-pass filtered; the subsequent voltage set-up time, current set-up time, current rate of change and current rise parameters are all determined according to the corresponding filtering results.

[0101] Starting from a unified trigger moment, when the number of consecutive preset sampling points of the processed command output segment voltage exceeds the voltage establishment threshold, the start moment of the first consecutive sampling segment is determined as the command output voltage establishment moment; when the number of consecutive preset sampling points of the processed disconnected coil terminal voltage exceeds the coil terminal voltage establishment threshold, the start moment of the corresponding consecutive sampling segment is determined as the disconnected coil terminal voltage establishment moment; when the number of consecutive preset sampling points of the processed disconnected coil current exceeds the current establishment threshold, the start moment of the corresponding consecutive sampling segment is determined as the coil current establishment moment.

[0102] The rate of change of current is calculated based on the continuous sampling values ​​after the coil current is established, and the average rate of change of current is calculated within the sliding detection window. When the decrease of the average rate of change of current in the current sliding detection window relative to the average rate of change of current in the previous sliding detection window is greater than the rate of change threshold, and the decreasing state is maintained for a preset number of sampling points, the first sampling moment corresponding to the decreasing state is determined as the moment when the electromagnetic drive feature appears.

[0103] The voltage establishment threshold and current establishment threshold are set between the upper limit of the noise of the corresponding acquisition channel and the minimum value of the normal response, respectively. The length of the sliding detection window and the number of consecutive confirmation sampling points are determined according to the sampling period and the shortest duration of the electromagnetic drive characteristics during the installation and commissioning stage. The rate of change threshold is determined according to the distribution range of the decrease in the rate of change of current of adjacent sliding detection windows in the normal segmentation sample.

[0104] The circuit breaker mechanical position detection signal is read. When the circuit breaker mechanical position detection signal changes from the closed position to the open position and remains continuously for a preset confirmation time, the moment of the first mechanical position change is determined as the moment when the circuit breaker completes its opening. The preset confirmation time is determined based on the maximum value between the maximum duration of the short-term bounce or fluctuation of the circuit breaker mechanical position detection signal after it enters the open position during normal opening tests in the installation and commissioning phase and the maximum value of the time sampling resolution.

[0105] Read the circuit breaker position feedback. If the circuit breaker mechanical position has been converted to the open position but the circuit breaker position feedback has not been converted to the open state within the preset feedback confirmation time, generate a position feedback deviation. If the coil current has ended and the circuit breaker mechanical position has not been converted to the open position, generate a mechanism response missing result.

[0106] The preset feedback confirmation time is determined based on the maximum time difference between the mechanical position switching time of the circuit breaker and the normal position feedback switching time during the installation and commissioning phase, and the maximum value of the time sampling resolution.

[0107] When both the unified trigger time and the command output voltage establishment time have been obtained, the command output response time is determined based on the time difference between them; otherwise, a command output response missing result is generated. When both the command output voltage establishment time and the disconnect coil terminal voltage establishment time have been obtained, the connection transmission response time is determined based on the time difference between them; otherwise, a connection transmission response missing result is generated. When both the disconnect coil terminal voltage establishment time and the coil current establishment time have been obtained, the coil current establishment time is determined based on the time difference between them; otherwise, a coil electrical response missing result is generated.

[0108] When both the coil current establishment time and the electromagnetic drive characteristic appearance time have been obtained, the electromagnetic drive characteristic appearance time is determined based on the time difference between the two; otherwise, a missing electromagnetic drive response result is generated. When both the electromagnetic drive characteristic appearance time and the circuit breaker breaking completion time have been obtained, the mechanism response time is determined based on the time difference between the two; otherwise, a missing mechanism response result is generated. When both the unified trigger time and the circuit breaker breaking completion time have been obtained, the breaking completion time is determined based on the time difference between the two; otherwise, a missing breaking completion response result is generated.

[0109] When both the coil current establishment time and the electromagnetic drive characteristic occurrence time have been obtained, the current rise parameter is determined based on the current change between the two, and the calculation formula is as follows:

[0110] ;

[0111] in, Indicates the parameter for current rise. This represents the processed current corresponding to the moment the coil current builds up. This represents the processed current corresponding to the moment when the electromagnetic drive characteristic appears. Indicates the moment when the coil current builds up. Indicates the moment when the electromagnetic drive characteristic appears; only when... Greater than The current rise parameter is calculated during operation, but not when no electromagnetic drive characteristics are detected.

[0112] Once a valid prediction range for this break has been generated, the actual command output response time, connection transmission response time, coil current establishment time, current rise parameter, electromagnetic drive characteristic appearance time, mechanism response time, and break completion time are compared with the corresponding ranges in the prediction range for this break. When the actual parameters are within the corresponding prediction range, a normal result for the corresponding stage is generated; when the actual parameters are less than the lower limit of the prediction range, an advance deviation for the corresponding stage is generated; when the actual parameters are greater than the upper limit of the prediction range, a delay deviation for the corresponding stage is generated; and when no corresponding response is detected, a missing response result for the corresponding stage is generated.

[0113] Once a valid prediction range for this break has been generated, the following steps are taken: generating a command output deviation based on the voltage establishment status of the command output section and the command output response time; generating a connection transmission deviation based on the command output section voltage, the break coil terminal voltage, and the connection transmission response time; generating a coil electrical deviation based on the coil current establishment time and current rise parameter; generating an electromagnetic drive deviation based on the occurrence time of electromagnetic drive characteristics; generating a mechanism response deviation based on the mechanism response time and the break completion time; and generating a position feedback deviation based on the consistency between the circuit breaker mechanical position detection signal and the circuit breaker position feedback. These deviations are then combined to form the actual break deviation result.

[0114] When the predicted range for this break is not generated, neither advance deviation nor delay deviation is generated. Based on whether the corresponding response is formed by the output section voltage, the break coil terminal voltage, the break coil current, the electromagnetic drive characteristics, the circuit breaker mechanical position, and the circuit breaker position feedback, the results of the response at each stage or the results of the missing response are generated and combined to form the actual break response result.

[0115] The temperature of the coil installation area and the voltage of the breaking control power supply during the actual breaking period are compared with the temperature of the coil installation area and the voltage of the breaking control power supply during the static detection period corresponding to this actual breaking. When the temperature difference or voltage difference is greater than the allowable difference for the corresponding operating condition, the actual breaking data is marked as inconsistent data. If the breaking prediction range has been generated, a condition mismatch result is generated. If the breaking prediction range has not been generated, a coil parameter abnormality pending verification result is generated, and other failure type judgments based on the actual breaking data are terminated. The actual breaking data that has already occurred is not used to replace the static detection results before the breaking to regenerate the breaking prediction range.

[0116] The allowable difference under operating conditions is determined based on normal temperature fluctuations, normal control voltage fluctuations, and measurement errors of the corresponding acquisition channels during the installation and commissioning phase.

[0117] When the actual breakage data is not marked as inconsistent data, the condition consistency judgment result is associated with the actual breakage deviation result or the actual breakage response result, depending on whether the breakage prediction range is generated, as input for the step-by-step identification of the breakage coil failure type and abnormal circuit section.

[0118] Based on the generated current coil state parameters, the current break prediction range, and prior anomaly evidence, as well as the actual break deviation or actual break response result corresponding to the generated state of the prediction range, the judgment is performed step by step in the order of command output section, connection transmission section, coil load section, electromagnetic drive process, operating mechanism, and position feedback loop. If there is a missing response in the previous section or it has been identified as an anomaly, the failure of the break coil body is not directly determined by the anomaly of the next section, and the judgment result of the previous section is determined as the prior evidence of anomaly attribution. If the current coil state parameters or the current break prediction range have not been generated, the corresponding judgment is performed only using the already formed prior anomaly evidence and the actual break response result.

[0119] When a disconnection command exists but the voltage of the command output segment is not established within the predicted range of the command output response time, or when no command output segment voltage establishment response is detected before the current disconnection prediction range is generated, an abnormal command output result is generated, and the determination of the disconnection coil status based on the connection transmission response, coil electrical response, and electromagnetic drive response is stopped.

[0120] When the voltage of the command output section is established normally, but the voltage of the disconnecting coil terminal is not established or the connection transmission response time is greater than the upper limit of the corresponding prediction range, and the equivalent resistance of the connection transmission section in the current coil status parameters is greater than the upper limit of the normal parameter range, an abnormal result of the connection transmission section is generated.

[0121] When the predicted range for this disconnection is not generated, but the equivalent resistance of the connection transmission section exceeds the coverage range of historical valid normal samples, and the voltage of the command output section has been established during the actual disconnection process while the voltage at the disconnection coil terminal has not been established, an abnormal result for the connection transmission section is generated.

[0122] If the static detection parameters are invalid and the current coil status parameters are not generated, and the voltage of the command output section has been established during the actual disconnection process but the voltage of the disconnection coil terminal has not been established, then an abnormal result for the connection transmission section will be generated.

[0123] When the voltage at the disconnecting coil terminals has been established but the disconnecting coil current has not reached the current establishment threshold, if static detection generates evidence of a pre-conduction anomaly, or if the temperature correction resistor is greater than the upper limit of the corresponding normal parameter range, then a disconnecting coil open-circuit failure result is generated.

[0124] When the voltage at the disconnecting coil terminal has been established but no disconnecting coil current has been generated, and static detection has not generated any evidence of an impending abnormality such as coil non-conduction, and the temperature correction resistor, coil equivalent time parameter, and equivalent resistance of the connection transmission section in the current coil state parameters are all within their respective normal parameter ranges, a static-dynamic evidence conflict result is generated, and it is not directly determined as a disconnecting coil open-circuit failure.

[0125] When the temperature correction resistor is less than the lower limit of the normal parameter range, the coil equivalent time parameter is less than the lower limit of the normal parameter range, and the current rise parameter during the actual breaking process is greater than the upper limit of the current rise prediction range, an abnormal failure result of the broken coil winding is generated.

[0126] When the predicted range for this break is not generated, the temperature correction resistance and the equivalent time parameter of the coil are both lower than the coverage range of the corresponding parameters of the historical valid normal samples, and a coil current is formed but an electromagnetic drive characteristic is not formed during the actual break, an abnormal failure result of the broken coil winding is generated.

[0127] When the predicted range for this break has been generated, and only one of the temperature correction resistor, coil equivalent time parameter, and current rise parameter exceeds the corresponding range, a coil parameter anomaly pending verification result is generated; when the predicted range for this break has not been generated, and a unique correspondence cannot be formed between the prior anomaly evidence and the actual break response result, a coil parameter anomaly pending verification result is also generated, and the abnormal failure type of the broken coil winding is not determined based on a single parameter.

[0128] When the temperature correction resistor, coil equivalent time parameter, and equivalent resistance of the connection transmission section in the current coil state parameters are all within their respective normal parameter ranges, the command output section voltage and the disconnected coil terminal voltage are established normally, the coil current establishment time is within the corresponding prediction range and the disconnected coil current has been formed, but the electromagnetic drive feature is not detected within the prediction range of the electromagnetic drive feature appearance time, an abnormal result of the disconnected coil electromagnetic drive is generated.

[0129] When the electromagnetic drive characteristics are formed within the corresponding prediction range, but the circuit breaker mechanical position detection signal is not converted to the breaking position within the predicted breaking time, an abnormal result of the operating mechanism is generated.

[0130] When the predicted range for this disconnection is not generated, but the command output section, connection transmission section and coil electrical response all exist, and electromagnetic drive characteristics have been formed while the mechanical position of the circuit breaker has not been converted to the disconnection position, an abnormal result of the operating mechanism is generated.

[0131] When the circuit breaker mechanical position detection signal has been converted to the open position, but the circuit breaker position feedback has not been converted to the open state within the preset feedback confirmation time, or when the open position feedback and the closed position feedback are both effective or both ineffective, an abnormal position feedback result is generated, and the abnormal position feedback is not determined as a failure of the open coil body.

[0132] When static detection forms preliminary evidence of an abnormality in the trip coil itself, and the command output section voltage, trip coil terminal voltage, coil current, electromagnetic drive characteristics, and circuit breaker mechanical position response are all formed normally during the actual tripping process, a static-dynamic evidence conflict result is generated. If the current tripping prediction range has been generated, each actual response should still be within the corresponding prediction range. If the current tripping prediction range has not been generated, the existence of responses at each stage and the circuit breaker completing the tripping are used as the basis for judging the normal formation of the dynamic response.

[0133] When static detection indicates that the breaking coil is in normal condition, but an abnormal response occurs during the actual breaking process that cannot be explained by the command output section, connection transmission section, operating mechanism, and position feedback loop, a static and dynamic evidence conflict result is generated, and the current coil state parameters, actual breaking deviation result or actual breaking response result, and response time of each stage are retained.

[0134] The corresponding judgment results from the following categories are combined to form the failure identification result of the disconnected coil: abnormal command output result, abnormal connection transmission section result, open circuit failure result of disconnected coil, abnormal winding failure result of disconnected coil, abnormal electromagnetic drive result of disconnected coil, abnormal operating mechanism result, abnormal position feedback result, abnormal coil parameter result pending verification result, static and dynamic evidence conflict result, and operating condition mismatch result.

[0135] Based on the failure identification results of the disconnected coil, the output includes the identified object, identification type, abnormal circuit section, prior abnormal evidence, and the actual disconnection deviation result or actual disconnection response result and detection time generated according to the predicted range. The identified objects include the command output section, connection transmission section, disconnected coil body, operating mechanism and position feedback circuit. The identification types include command output abnormality, connection transmission abnormality, open circuit failure, winding abnormality failure, electromagnetic drive abnormality, operating mechanism abnormality, position feedback abnormality, coil parameter abnormality pending verification, static and dynamic evidence conflict and operating condition mismatch.

[0136] When a fault is identified as a circuit breaker failure or an abnormal failure of the circuit breaker winding, a fault breaker check prompt will be output; when a fault is identified as an abnormality in the connection transmission section, a fault prompt will be output for the connection interface, connection terminal, and connection wire; when a fault is identified as an abnormality in the operating mechanism, a fault prompt will be output for the operating mechanism; when a fault is identified as an abnormality in the position feedback, a fault prompt will be output for the circuit breaker mechanical position detection component, open auxiliary contact, and closed auxiliary contact.

[0137] When generating abnormal coil parameter results awaiting verification, static and dynamic evidence conflict results, or operating condition mismatch results, the system does not output a definite coil failure type. Instead, it retains the generated current coil state parameters or the detection data that invalidates the static detection parameters, as well as the generated actual breaking deviation results or actual breaking response results, response times, and corresponding operating condition data. The system also stops using the current detection data to update the normal parameter range.

[0138] When the temperature correction resistor, coil equivalent time parameter, and equivalent resistance of the connection transmission section in the current coil status parameters are all within their respective normal parameter ranges, the actual disconnection stages are all within the predicted range of this disconnection, the circuit breaker mechanical position changes normally, the circuit breaker position feedback is consistent with the mechanical position, and there are no inconsistencies in conditions, conflicting evidence, or abnormal circuit sections, the current static detection data and the actual disconnection data are determined as candidate normal data.

[0139] The candidate normal data and the most recent historical valid normal samples are combined to form a parameter drift judgment sequence. The parameter drift judgment is performed at least for the temperature correction resistance, the coil equivalent time parameter, the equivalent resistance of the connection transmission section, the mechanism response time and the breakup completion time.

[0140] When the data in the parameter drift judgment sequence that have a consecutive preset number of drift confirmations meet the condition that the same parameter changes in the same direction relative to the previous data, and the parameter difference between the first data and the last data is greater than or equal to the preset drift threshold, the parameter drift stop condition is triggered. The current candidate normal data is not written into the historical valid normal samples, nor is the current candidate normal data used to generate the subsequent prediction range for this segmentation. When the drifting parameter is the temperature correction resistance, the coil equivalent time parameter, or the equivalent resistance of the connection transmission section, the automatic update of the corresponding normal parameter range is stopped. When the drifting parameter is the mechanism response time or the segmentation completion time, the current normal parameter range is retained, and only the writing of historical valid normal samples and the subsequent prediction benchmark update are stopped.

[0141] If the current candidate normal data does not trigger the parameter drift stopping condition, the current candidate normal data will be determined as a valid normal sample and written into the history of valid normal samples.

[0142] The valid normal samples include coil installation area temperature, disconnection control power supply voltage, temperature correction resistor, coil equivalent time parameter, connection transmission section equivalent resistance, command output response time, connection transmission response time, coil current establishment time, current rise parameter, electromagnetic drive characteristic appearance time, mechanism response time, and disconnection completion time, and keep the same static detection result correlated with the corresponding first actual disconnection response.

[0143] The newly added valid normal samples are combined with the most recently preset number of existing valid normal samples to form a candidate normal sample set. Based only on the temperature correction resistor, coil equivalent time parameter, and equivalent resistance of the connection transmission section in the candidate normal sample set, the lower limit and upper limit of the candidate range for the corresponding parameters are determined respectively.

[0144] The command output response time, connection transmission response time, coil current settling time, current rise parameter, electromagnetic drive feature appearance time, mechanism response time, and break completion time in the valid normal samples are retained in the historical valid normal samples and used to generate the break prediction range in the future. They are not included in the normal parameter range.

[0145] The candidate range boundaries of the three static parameters are compared with the current normal parameter range boundaries. When the boundary change is less than or equal to the preset single adjustment upper limit, the normal parameter range is updated using the candidate range boundaries. When the boundary change is greater than the preset single adjustment upper limit, the corresponding range boundary is moved towards the candidate range boundary according to the preset single adjustment upper limit.

[0146] The preset single adjustment limit is taken as the maximum normal fluctuation range of the corresponding parameter during the installation and commissioning phase and the maximum value in the corresponding parameter measurement resolution.

[0147] The preset drift confirmation number is determined based on the number of consecutive normal samples during the installation and commissioning phase, and the preset drift threshold is determined based on the maximum normal fluctuation amplitude of the corresponding parameter and the maximum value in the measurement resolution of the corresponding parameter during the installation and commissioning phase.

[0148] When the drifting parameter is the temperature correction resistor, the coil equivalent time parameter, or the equivalent resistance of the connection transmission section, after re-performing the normal state confirmation and obtaining a valid normal sample that has not triggered the parameter drift stop condition, the corresponding normal parameter range is re-determined based on the confirmed valid normal sample, and the admission judgment of subsequent valid normal samples is restored; when the drifting parameter is the mechanism response time or the breaking completion time, after re-performing the normal state confirmation and obtaining a valid normal sample that has not triggered the parameter drift stop condition, the writing of historical valid normal samples and subsequent prediction benchmark updates are restored, and the normal parameter range is not re-determined.

[0149] The system saves the failure identification results of the broken coil, valid normal samples, and updated normal parameter ranges. The failure identification results of the broken coil are used to characterize the current anomaly and the corresponding inspection object. The historical valid normal samples are used to generate the prediction range for the current break. The updated normal parameter ranges are used to determine whether the temperature correction resistance, coil equivalent time parameter, and equivalent resistance of the connection transmission section in the current coil status parameters are within their respective normal parameter ranges.

[0150] Example 2:

[0151] This embodiment provides a high-voltage switchgear disconnecting coil failure identification system, and implements the high-voltage switchgear disconnecting coil failure identification method, including:

[0152] The static detection module is used to apply a detection signal to the breaking control circuit without triggering the breaking coil when the circuit breaker is in the breaking position. Based on the collected instructions, it outputs the section voltage, breaking coil terminal voltage, detection current, and coil installation area temperature to form static detection results, and determines whether to generate current coil state parameters based on the static detection results.

[0153] The range generation module is used to select similar normal samples from the historical valid normal samples when the current coil state parameters are generated and the current coil state parameters are within the parameter coverage range of the historical valid normal samples, and generate the current segmentation prediction range based on the response parameters of each stage of the selected samples; when the current coil state parameters are not generated or they exceed the parameter coverage range, the corresponding static detection results are retained.

[0154] The response extraction module is used to collect the breaking command signal, the voltage of the command output section, the voltage of the breaking coil terminal, the breaking coil current and the mechanical position of the circuit breaker during the actual breaking process, and to extract the response parameters of each stage corresponding to the command output, connection transmission, coil electrical, electromagnetic drive and mechanism response.

[0155] The anomaly attribution module is used to compare the response parameters of each stage with the corresponding prediction range based on whether the current segmentation prediction range has been generated, or to determine whether the response of each stage has been formed, and to determine the anomaly attribution level by level according to the order of the responses of each stage.

[0156] The result generation module is used to generate the failure identification result of the broken coil based on the anomaly attribution and static detection results.

[0157] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A method for identifying the failure of a high-voltage switchgear disconnecting coil, characterized in that, include: When the circuit breaker is in the open position, a detection signal that does not trigger the action of the open coil is applied to the open control circuit. Based on the collected instructions, the section voltage, open coil terminal voltage, detection current and coil installation area temperature are output to form static detection results. Based on the static detection results, it is determined whether to generate the current coil state parameters. When the current coil state parameters are generated and the current coil state parameters are within the parameter coverage range of historical valid normal samples, a similar normal sample is selected from the historical valid normal samples, and the current segmentation prediction range is generated based on the response parameters of each stage of the selected sample. If no current coil state parameters are generated or if they exceed the parameter coverage range, the corresponding static detection results are retained. During the actual disconnection process, the disconnection command signal, command output section voltage, disconnection coil terminal voltage, disconnection coil current, and circuit breaker mechanical position are collected, and response parameters for each stage corresponding to command output, connection transmission, coil electrical, electromagnetic drive, and mechanism response are extracted. Based on whether the predicted range of this segmentation is generated, the response parameters of each stage are compared with the corresponding predicted range or it is determined whether the response of each stage is formed, and the anomaly attribution is determined step by step according to the order of the responses of each stage. Based on the anomaly attribution and static detection results, a broken coil failure identification result is generated.

2. The method for identifying the failure of a high-voltage switchgear disconnecting coil according to claim 1, characterized in that, A conduction detection signal and a parameter detection signal are sequentially applied to the disconnection control circuit. When a detection voltage is formed at the disconnection coil terminal and the detection current reaches the conduction judgment threshold, it is determined that the disconnection coil is in a conducting state, and the parameter detection stable section is determined based on the change in detection current after the parameter detection signal is applied.

3. The method for identifying the failure of a high-voltage switchgear disconnecting coil according to claim 2, characterized in that, When the disconnecting coil is in the conducting state and a stable parameter detection section is formed, the equivalent resistance of the current coil is determined based on the voltage at the disconnecting coil terminal and the detection current within the stable parameter detection section. The equivalent resistance of the current coil is then temperature-corrected based on the temperature of the coil installation area to obtain a temperature-corrected resistance. The equivalent time parameter of the coil is determined based on the rise process of the detection current after the parameter detection signal is applied. Finally, the equivalent resistance of the connection transmission section is determined based on the voltage of the command output section, the voltage at the disconnecting coil terminal, and the detection current. The current coil state parameters include at least the temperature-corrected resistance, the equivalent time parameter of the coil, and the equivalent resistance of the connection transmission section. The connection transmission section includes the connection loop between the disconnecting command output component and the disconnecting coil input terminal, and between the disconnecting coil return terminal and the disconnecting control power supply return terminal.

4. The method for identifying the failure of a high-voltage switchgear disconnecting coil according to claim 2, characterized in that, When the disconnected coil is not conducting, evidence of an impending abnormality is generated and the current coil state parameters are not generated; when the disconnected coil is conducting but a stable parameter detection segment has not been formed, the current coil state parameters are not generated and the corresponding static detection results are retained.

5. The method for identifying the failure of a high-voltage switchgear disconnecting coil according to claim 1, characterized in that, Each historical valid normal sample includes the coil state parameters under normal conditions and the corresponding response parameters at each stage. The sample difference value is determined based on the parameter differences between the current coil state parameters and the coil state parameters in each historical valid normal sample.

6. The method for identifying the failure of a high-voltage switchgear disconnecting coil according to claim 5, characterized in that, Multiple similar normal samples are selected in ascending order of sample difference value. Corresponding prediction ranges are generated based on the value range of response parameters at each stage in the multiple similar normal samples. The prediction ranges are then combined to form the prediction range for this segmentation.

7. The method for identifying the failure of a high-voltage switchgear disconnecting coil according to claim 1, characterized in that, The response parameters for each stage include command output response time, connection transmission response time, coil current establishment time, current rise parameter, electromagnetic drive characteristic appearance time, mechanism response time, and disconnection completion time. The command output response time is determined based on the time when the disconnection command signal appears and the time when the command output section voltage is established. The connection transmission response time is determined based on the time when the command output section voltage is established and the time when the disconnection coil terminal voltage is established. The coil current establishment time is determined based on the time when the disconnection coil terminal voltage is established and the time when the disconnection coil current is established.

8. The method for identifying the failure of a high-voltage switchgear disconnecting coil according to claim 7, characterized in that, The timing of the electromagnetic drive characteristic is determined by the change in the current of the disconnected coil. The current rise parameter is determined by the amount of current change and the time difference between the coil current establishment time and the timing of the electromagnetic drive characteristic. The timing of the electromagnetic drive characteristic is determined by the time difference between the coil current establishment time and the timing of the electromagnetic drive characteristic. The mechanism response time is determined based on the moment when the electromagnetic drive characteristic appears and the moment when the circuit breaker's mechanical position changes to the breaking position, and the breaking completion time is determined based on the moment when the breaking command signal appears and the moment when the circuit breaker's mechanical position changes to the breaking position.

9. The method for identifying the failure of a high-voltage switchgear disconnecting coil according to claim 1, characterized in that, When the current segmentation prediction range has been generated, the response parameters of each stage are compared with the corresponding prediction range. Based on the comparison results, the corresponding stage's normal result, deviation below the lower limit of the prediction range, deviation above the upper limit of the prediction range, or response missing result are generated and combined to form the actual segmentation deviation result. When the current segmentation prediction range has not been generated, the actual segmentation response result is generated based on whether the response of each stage has been formed.

10. The method for identifying the failure of a high-voltage switchgear disconnecting coil according to claim 9, characterized in that, Based on the actual breakage deviation or actual breakage response, the anomaly attribution is determined step by step in the order of command output response, connection transmission response, coil electrical response, electromagnetic drive response, and mechanism response. If the response of the previous stage is missing or is determined to be abnormal, the failure of the breakage coil body is not directly determined based on the abnormal response of the subsequent stage, and the judgment result of the previous stage is used as the basis for the subsequent anomaly attribution judgment.

11. The method for identifying the failure of a high-voltage switchgear disconnecting coil according to claim 10, characterized in that, The current coil state parameters include the temperature correction resistor. The normal parameter range is established based on the coil state parameters in historical valid normal samples. If no command output response is generated, the command output is determined to be abnormal. If the command output response is not determined to be abnormal and no connection transmission response is generated, the connection transmission is determined to be abnormal. If the voltage at the disconnecting coil terminal has been established but no disconnecting coil current has been generated, and any of the following conditions are met, the disconnecting coil open-circuit failure is determined: the static detection result includes evidence of a pre-existing abnormality such as coil non-conduction; the temperature correction resistor is greater than the upper limit of the temperature correction resistor in the normal parameter range.

12. The method for identifying the failure of a high-voltage switchgear disconnecting coil according to claim 10, characterized in that, The normal parameter range is established based on the coil state parameters in the historical valid normal samples. When the current interruption prediction range has been generated, if the command output response, connection transmission response, and coil electrical response are all normal, and the temperature correction resistance, coil equivalent time parameter, and connection transmission section equivalent resistance in the current coil state parameters are all within their respective normal parameter ranges, and no electromagnetic drive response is formed, the interruption coil electromagnetic drive is determined to be abnormal. If the electromagnetic drive characteristic appears within the corresponding prediction range, but the circuit breaker mechanical position does not change to the interruption position within the interruption completion time prediction range, the operating mechanism is determined to be abnormal.

13. The method for identifying the failure of a high-voltage switchgear disconnecting coil according to claim 1, characterized in that, When generating the current breakage prediction range, the coil installation area temperature and breakage control power supply voltage during the static detection period are associated with the current breakage prediction range. The coil installation area temperature and breakage control power supply voltage during the actual breakage process are compared with the coil installation area temperature and breakage control power supply voltage associated with the current breakage prediction range. When the difference of any parameter is greater than the allowable difference for the corresponding operating condition, the anomaly is not determined based on the current breakage prediction range, and an operating condition mismatch result is generated.

14. A high-voltage switchgear disconnecting coil failure identification system, implementing the high-voltage switchgear disconnecting coil failure identification method according to any one of claims 1-13, characterized in that, include: The static detection module is used to apply a detection signal to the tripping control circuit without triggering the tripping coil when the circuit breaker is in the tripping position. Based on the collected instructions, it outputs the section voltage, tripping coil terminal voltage, detection current and coil installation area temperature to form static detection results, and determines whether to generate current coil state parameters based on the static detection results. The range generation module is used to select similar normal samples from the historical valid normal samples when the current coil state parameters are generated and the current coil state parameters are within the parameter coverage range of the historical valid normal samples, and generate the current segmentation prediction range based on the response parameters of each stage of the selected samples. If no current coil state parameters are generated or if they exceed the parameter coverage range, the corresponding static detection results are retained. The response extraction module is used to collect the breaking command signal, the voltage of the command output section, the voltage of the breaking coil terminal, the breaking coil current and the mechanical position of the circuit breaker during the actual breaking process, and to extract the response parameters of each stage corresponding to the command output, connection transmission, coil electrical, electromagnetic drive and mechanism response. The anomaly attribution module is used to compare the response parameters of each stage with the corresponding prediction range based on whether the current segmentation prediction range has been generated, or to determine whether the response of each stage has been formed, and to determine the anomaly attribution level by level according to the order of the responses of each stage. The result generation module is used to generate the failure identification result of the broken coil based on the anomaly attribution and static detection results.

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