Electrical loop fault diagnosis method, apparatus and device, and storage medium

Abstract

The invention discloses an electrical loop fault diagnosis method, device and equipment and a storage medium, and the method comprises the steps: when a target electrical parameter of a system has first abnormal disturbance, if no other abnormal disturbance occurs after the first abnormal disturbance occurs, or the target electrical parameter has other abnormal disturbance within a first time period after the first abnormal disturbance occurs, determining that the target electrical parameter is abnormal; if yes, recording first electrical state monitoring data of an electrical loop terminal load within a target time period before and after the first abnormal disturbance as fault tracing data; if the target electrical parameter has second abnormal disturbance within a second time period after the first abnormal disturbance occurs, recording the first electrical state monitoring data and second electrical state monitoring data of each electrical loop terminal load within the target time period before and after the second abnormal disturbance occurs as fault tracing data; the relevance of the abnormal disturbance events is intelligently judged, the efficiency and quality of abnormal disturbance data recording can be remarkably improved, and storage and computing resources are saved.

Description

Technical Field

[0001] This invention relates to the field of electrical fault diagnosis technology, and specifically to a method, apparatus, equipment, and storage medium for diagnosing electrical circuit faults. Background Technology

[0002] In urban rail transit, the reliability of the electrical circuits of subway vehicles is directly related to the safety of subway operation. The control circuits of subway vehicles drive different electrical circuits according to various control commands (such as switches, buttons, and driver controllers) and certain logical relationships, ultimately realizing the various functions required for train operation and their fault protection. Different electrical circuits in the subway system are controlled and electrically connected through their core control components such as relays and contactors. These components can experience performance degradation under long-term electrical and mechanical stress, leading to control failures in the subway system.

[0003] Currently, fault monitoring of control systems in subway systems is mainly achieved by monitoring, recording, and analyzing abnormal electrical parameters in electrical circuits. However, traditional fault monitoring schemes either mechanically initiate waveform recording for each electrical parameter anomaly, resulting in fragmented records of potentially identical anomalies being split into multiple fragmented files with a large amount of repetitive data; or they rigidly record electrical parameter anomalies for a predetermined duration, failing to respond to subsequent new events and potentially missing critical fault information. This approach makes source tracing analysis difficult and wastes significant storage and computing resources. Summary of the Invention

[0004] The purpose of this invention is to overcome the deficiencies in the prior art and provide an electrical circuit fault diagnosis method, apparatus, equipment, and storage medium that can significantly improve the efficiency and quality of abnormal disturbance data recording and save storage and computing resources.

[0005] To achieve the above objectives, the first aspect of the present invention provides a method for diagnosing electrical circuit faults, comprising: Monitor the electrical status parameters of the terminal loads of each electrical circuit; When a first abnormal disturbance occurs in the electrical status parameters of the target electrical parameter of any electrical circuit terminal load, if no other abnormal disturbance occurs in the target electrical parameter during the first time period and the second time period after the first abnormal disturbance occurs, or if the target electrical parameter occurs during the first time period after the first abnormal disturbance occurs, the first electrical status monitoring data of each electrical circuit terminal load during the target time period before and after the first abnormal disturbance occurs shall be recorded as fault tracing data of the abnormal target electrical parameter. If the target electrical parameter experiences a second abnormal disturbance within the second time period after the first abnormal disturbance occurs, the first electrical condition monitoring data and the second electrical condition monitoring data of the terminal load of each electrical circuit within the target time period before and after the second abnormal disturbance are recorded as fault tracing data for the abnormality of the target electrical parameter, wherein the second time period is after the first time period; Based on the fault tracing data, analyze the relevant faulty electrical circuits that caused the abnormality of the target electrical parameters.

[0006] Furthermore, the monitoring of the electrical status parameters of the terminal load of each electrical circuit includes: The voltage, current, and corresponding on / off times of the terminal loads, including relays and contactors, are collected by voltage and current probes installed in the terminal loads of each electrical circuit.

[0007] Furthermore, the first time period is within 100ms after the occurrence of the abnormal disturbance, the second time period is from 100ms after the occurrence of the abnormal disturbance to 1s, and the target time period is within 100ms before the occurrence of the abnormal disturbance and within 100ms after the occurrence of the abnormal disturbance.

[0008] Furthermore, the step of analyzing the relevant faulty electrical circuits that caused the abnormality of the target electrical parameters based on the fault tracing data includes: Based on the fault tracing data, determine the first electrical circuit where the target electrical parameters of the terminal load are abnormal; Based on the logical control relationship between the first electrical circuits, determine the second electrical circuit in the first electrical circuit that serves as the source of the abnormality of the target electrical parameter; Based on the electrical status monitoring data of the terminal load of the second electrical circuit in the fault tracing data, analyze whether the second electrical circuit has experienced a related fault that caused the abnormality of the target electrical parameters.

[0009] Furthermore, the step of analyzing whether a related fault causing the abnormality of the target electrical parameters has occurred in the second electrical circuit based on the electrical status monitoring data of the terminal load of the second electrical circuit in the fault tracing data includes: The pull-in time and overtravel time of the terminal load of the second electrical circuit are determined based on the electrical status monitoring data of the terminal load of the second electrical circuit. The pull-in time and overtravel time of the terminal load of the second electrical circuit are compared with the preset degradation trajectory model to obtain the comparison results; Based on the comparison results, determine whether the terminal load of the second electrical circuit has experienced aging or failure that causes the target electrical parameters to be abnormal; The degradation trajectory model is a model established based on historical operating data of similar terminal loads, representing the variation of its pull-in time and overtravel time with working time or number of operations.

[0010] Furthermore, the electrical status monitoring data of the terminal load of the second electrical circuit includes the voltage data, current data and corresponding on / off time of the terminal load of the second electrical circuit; The step of determining the pull-in time and overtravel time of the terminal load of the second electrical circuit based on the electrical status monitoring data of the terminal load of the second electrical circuit includes: Based on the voltage data of the terminal load of the second electrical circuit and its corresponding on / off time, plot the waveform curves of the voltage and current of the terminal load of the second electrical circuit as a function of on / off time. The pull-in time and overtravel time of the terminal load of the second electrical circuit are determined based on the waveform curve.

[0011] Furthermore, before comparing the pull-in time and overtravel time of the terminal load of the second electrical circuit with the degradation trajectory of the terminal load in the preset degradation trajectory model, the method further includes: Collect historical electrical condition monitoring data of terminal loads in multiple electrical circuits, and perform data preprocessing on the historical electrical condition monitoring data; Extract the characteristic data of terminal load engagement time and overtravel time from the historical electrical condition monitoring data; The feature data is processed using wavelet analysis; The degradation trajectory model is established based on the feature data using regression analysis.

[0012] A second aspect of the present invention provides an electrical circuit fault diagnosis device, comprising: The monitoring module is used to monitor the electrical status parameters of the terminal load of each electrical circuit; The recording module is configured to, when a first abnormal disturbance occurs in the electrical status parameters of a target electrical parameter in any electrical circuit terminal load, if no other abnormal disturbance occurs in the target electrical parameter during a first time period and a second time period after the first abnormal disturbance occurs, or if other abnormal disturbance occurs in the target electrical parameter during the first time period after the first abnormal disturbance occurs, record the first monitoring data of the target electrical parameter of each electrical circuit terminal load during the target time period before and after the first abnormal disturbance as fault tracing data of the target electrical parameter abnormality; if a second abnormal disturbance occurs in the target electrical parameter during a second time period after the first abnormal disturbance occurs, record the first monitoring data and the second monitoring data of the target electrical parameter of each electrical circuit terminal load during the target time period before and after the second abnormal disturbance as fault tracing data of the target electrical parameter abnormality, wherein the second time period is after the first time period; The analysis module is used to determine the electrical circuits that are related to the abnormality of the target electrical parameters based on the fault tracing data.

[0013] Furthermore, when monitoring the electrical status parameters of the terminal load of each electrical circuit, the monitoring module is specifically used to collect the voltage, current and corresponding on / off time of the terminal load by means of voltage probes and current probes installed in the terminal load of each electrical circuit, wherein the terminal load includes relays and contactors.

[0014] Furthermore, the first time period is within 100ms after the occurrence of the abnormal disturbance, the second time period is from 100ms after the occurrence of the abnormal disturbance to 1s, and the target time period is within 100ms before the occurrence of the abnormal disturbance and within 100ms after the occurrence of the abnormal disturbance.

[0015] Furthermore, when the analysis module analyzes the relevant faulty electrical circuits that cause the abnormality of the target electrical parameters based on the fault tracing data, it is specifically used to determine the first electrical circuit in which the target electrical parameters of the terminal load are abnormal based on the fault tracing data; determine the second electrical circuit in the first electrical circuit that is the source of the abnormality of the target electrical parameters based on the logical control relationship between the first electrical circuits; and analyze whether the second electrical circuit has experienced a relevant fault that causes the abnormality of the target electrical parameters based on the electrical status monitoring data of the terminal load of the second electrical circuit in the fault tracing data.

[0016] Furthermore, when the analysis module analyzes whether the second electrical circuit has experienced a related fault that causes the abnormality of the target electrical parameter based on the electrical status monitoring data of the terminal load of the second electrical circuit in the fault tracing data, it is specifically used to determine the pull-in time and overtravel time of the terminal load of the second electrical circuit based on the electrical status monitoring data of the terminal load of the second electrical circuit; compare the pull-in time and overtravel time of the terminal load of the second electrical circuit with a preset degradation trajectory model to obtain a comparison result; and determine whether the terminal load of the second electrical circuit has experienced aging or a fault that causes the abnormality of the target electrical parameter based on the comparison result; wherein, the degradation trajectory model is a model established based on the historical operating data of similar terminal loads to characterize the change law of its pull-in time and overtravel time with working time or number of operations.

[0017] Furthermore, the electrical status monitoring data of the terminal load of the second electrical circuit includes the voltage data, current data and corresponding on / off time of the terminal load of the second electrical circuit; When the analysis module determines the pull-in time and overtravel time of the terminal load of the second electrical circuit based on the electrical status monitoring data of the terminal load of the second electrical circuit, it is specifically used to plot the waveform curves of the voltage and current of the terminal load of the second electrical circuit changing with the on / off time based on the voltage data of the terminal load of the second electrical circuit and its corresponding on / off time; and to determine the pull-in time and overtravel time of the terminal load of the second electrical circuit based on the waveform curves.

[0018] Furthermore, the electrical circuit fault diagnosis device also includes a modeling module, used to collect historical electrical condition monitoring data of the terminal loads in multiple electrical circuits before comparing the pull-in time and overtravel time of the terminal load of the second electrical circuit with the degradation trajectory of the terminal load in the preset degradation trajectory model; perform data preprocessing on the historical electrical condition monitoring data; extract feature data of the pull-in time and overtravel time of the terminal load in the historical electrical condition monitoring data; process the feature data using wavelet analysis; and establish the degradation trajectory model based on the feature data using regression analysis.

[0019] A third aspect of the present invention provides an electronic device, including a memory and a processor, wherein the memory stores a computer program that, when executed by the processor, implements the method of any of the first aspects.

[0020] A fourth aspect of the present invention provides a computer-readable storage medium having program instructions stored thereon, which, when executed, implement the method of any one of the first aspects.

[0021] The advantages and beneficial effects of this invention are as follows: It intelligently groups other abnormal disturbances of the same signal occurring in the initial stage of a system abnormal disturbance into a single abnormal disturbance event for continuous recording. This effectively avoids data fragmentation, generating a complete and coherent data file of the initial transient process of the fault, greatly reducing invalid data redundancy, and providing a high-quality data foundation for subsequent analysis. After the system enters a relatively stable oscillation mid-term following an abnormal disturbance, recording of new disturbance events of the same type occurring during this period is restarted. This allows for timely capture of these new disturbance events with time intervals, avoiding the possibility of neglecting new similar events due to recording previous events, as is possible in traditional methods. This effectively prevents the omission of fault information due to a rigid recording mechanism, ensuring the integrity of fault tracing data. By setting differentiated response rules for the same signal disturbance in different periods after a system abnormal disturbance, the correlation of abnormal disturbance events is intelligently determined. This ensures the integrity of abnormal disturbance recording while avoiding data fragmentation and duplication, significantly improving the efficiency and quality of abnormal disturbance data recording. This, in turn, ensures that subsequent fault tracing can be performed quickly and accurately, while saving storage and computing resources. Attached Figure Description

[0022] Figure 1 This is a flowchart of the electrical circuit fault diagnosis method of the present invention; Figure 2 This is a schematic diagram showing the waveforms of coil current and contact voltage when the relay is energized. Figure 3 This is a schematic diagram of the electrical circuit fault diagnosis device of the present invention; Figure 4 This is a schematic diagram of the electronic device structure of the present invention. Detailed Implementation

[0023] The specific embodiments of the present invention will be further described below with reference to the accompanying drawings and examples. The following examples are only used to more clearly illustrate the technical solutions of the present invention and should not be construed as limiting the scope of protection of the present invention.

[0024] according to Figure 1 As shown, the electrical circuit fault diagnosis method of the present invention includes the following steps: S101. Monitor the electrical status parameters of the terminal load of each electrical circuit.

[0025] In a subway system, various electrical circuits are connected and driven according to certain logical relationships to achieve the various functions required for train operation and their fault protection, such as power supply, traction, braking, door opening and closing, and lighting. Subway system electrical circuits use a large number of relays and contactors as control devices, utilizing metal contacts to control the on / off state of circuits and realize logical control between various electrical circuits. Therefore, the most common terminal loads in subway system electrical circuits are relays and contactors.

[0026] The electrical circuits of a subway system contain numerous components, and one-to-one data acquisition would make the diagnostic system more cumbersome. Therefore, by monitoring the electrical status parameters of the terminal loads in each circuit, and with the monitored data having an absolute time stamp, the abnormal links can be accurately located based on logical relationships. This not only saves the number of measurement points, but also enables full coverage of circuit status management.

[0027] In order to reliably monitor the electrical status parameters of the terminal loads of electrical circuits, a preferred embodiment of the present invention is to monitor the electrical status parameters of the terminal loads of each electrical circuit, including: collecting the voltage, current and corresponding on / off times of the terminal loads by means of voltage probes and current probes installed in the terminal loads of each electrical circuit, wherein the terminal loads include relays and contactors.

[0028] Taking a relay as an example, a voltage probe is placed in the relay contact circuit, and a current probe is placed in the relay control coil circuit. The voltage probe collects the voltage at the relay contacts and the current in the control coil. The diagnostic system analyzes the status of each electrical circuit by capturing relevant monitoring data when abnormal disturbances occur, thereby achieving intelligent fault diagnosis.

[0029] S102. When a first abnormal disturbance occurs in the target electrical parameter among the electrical status parameters of any electrical circuit terminal load, if no other abnormal disturbance occurs in the target electrical parameter during the first time period and the second time period after the occurrence of the first abnormal disturbance, or if other abnormal disturbance occurs in the target electrical parameter during the first time period after the occurrence of the first abnormal disturbance, the first electrical status monitoring data of each electrical circuit terminal load during the target time period before and after the occurrence of the first abnormal disturbance shall be recorded as the fault tracing data of the abnormality of the target electrical parameter.

[0030] S103. If the target electrical parameter experiences a second abnormal disturbance within the second time period after the first abnormal disturbance occurs, the first electrical condition monitoring data and the second electrical condition monitoring data of the terminal load of each electrical circuit within the target time period before and after the second abnormal disturbance are recorded as fault tracing data for the abnormality of the target electrical parameter. The second time period is after the first time period.

[0031] Abnormal disturbances in an electrical system refer to a sudden, unexpected deviation from the normal or rated value of a certain indicator or parameter (such as voltage, current, frequency, power, etc.).

[0032] Electrical condition monitoring data refers to a series of electrical parameter data, such as voltage, current, power, resistance, and frequency, collected, recorded, and analyzed to understand and evaluate the operating status of electrical equipment or electrical systems.

[0033] To ensure the capture of critical information about abnormal disturbances while maximizing the efficiency of system resource utilization, a preferred embodiment of the present invention is that the first time period is within 100ms after the occurrence of the abnormal disturbance, the second time period is from 100ms after the occurrence of the abnormal disturbance to 1s, and the target time period is within 100ms before the occurrence of the abnormal disturbance and within 100ms after the occurrence of the abnormal disturbance.

[0034] When an electrical parameter is detected to meet the abnormal disturbance criteria, such as a relay voltage rising above or falling above a threshold, a sudden abnormal disturbance (transient) is determined to have occurred in the subway's electrical circuit system. Let t be the time of occurrence of the sudden abnormal disturbance. Let the time interval from time a to t be denoted as A, the time interval from time t to time b as B, and the time interval from time b to time c as C. The duration of time interval A is 100ms, the duration of time interval B is 100ms, and the duration of time interval C is 900ms, i.e., 1s - 100ms.

[0035] The monitoring data within time period A represents the state data of the subway electrical circuit system before the onset of a sudden abnormal disturbance. The highest sampling frequency when capturing and recording the monitoring data of the terminal loads of each electrical circuit within time period A can be set to 250kHz. The steady-state data of the electrical circuit system before the abnormal disturbance is recorded in detail, providing an analytical basis for subsequent fault tracing data to capture the cause of the fault.

[0036] The monitoring data in time period B is the initial state data of the subway electrical circuit system during the sudden abnormal disturbance. The highest sampling frequency when capturing and recording the monitoring data of each electrical circuit terminal load in time period B can also be set to 250kHz. This ensures the integrity of the transient data of the electrical circuit system in the initial stage of the abnormal disturbance, provides a data basis for fault analysis, and avoids data redundancy.

[0037] The monitoring data during period C represents the status data during the mid-term of a sudden abnormal disturbance in the subway electrical circuit system. During this period, it is only necessary to continue monitoring the electrical circuit system to ensure the capture of cascading faults and prevent information omissions. The highest sampling frequency for capturing monitoring data should be set to 50kHz. There is no need to record the monitoring data during this period as fault tracing data.

[0038] During period B, which is the initial stage of an abnormal disturbance, the electrical circuit system is in a highly unstable state. Electrical state parameters such as voltage and current may oscillate violently, repeatedly meeting the abnormal disturbance criteria. If recording is restarted for each abnormal disturbance that meets the criteria, a large number of highly overlapping waveform files will be generated for the same abnormal disturbance event, causing serious data redundancy. By stipulating that waveform recording is not restarted during period B, the system treats the initial 200ms (100ms before the abnormal disturbance + 100ms after the abnormal disturbance) as an indivisible and complete transient event for recording, generating a high-quality, coherent data file, which facilitates subsequent transient analysis of abnormal disturbances.

[0039] 100ms after an abnormal disturbance, the electromagnetic transient process of the electrical circuit system has usually ended. Entering the middle stage of the abnormal disturbance, the electrical circuit system is typically in a steady-state oscillation phase. During the 900ms of period C (covering 1 second after the fault), many automatic devices (such as reclosing and backup power supply activation) operate within this period. If the same signal experiences another abnormal disturbance hundreds of milliseconds after the previous one, it is likely a new, independent abnormal disturbance event, and this new independent abnormal disturbance is a cascading event triggered by the initial abnormal disturbance. In this case, it is permissible to restart recording for this new abnormal disturbance, generating a new waveform file for period AB, which also serves as fault tracing data for the initial abnormal disturbance. This ensures that the diagnostic system can capture such cascading abnormal disturbance events triggered by the initial abnormal disturbance, avoiding the omission of important information.

[0040] S104. Analyze the relevant faulty electrical circuits that cause abnormal electrical parameters of the target based on the fault tracing data.

[0041] To reduce the amount of data processing and computational resources required for fault tracing analysis, and to quickly and accurately locate the source of faults in complex circuit systems, a preferred embodiment of this invention involves analyzing the relevant faulty electrical circuits that cause abnormal target electrical parameters based on fault tracing data. This includes: identifying a first electrical circuit in which the target electrical parameters of the terminal load are abnormal based on the fault tracing data; identifying a second electrical circuit in the first electrical circuit that is the source of the abnormal target electrical parameters based on the logical control relationship between the first electrical circuits; and analyzing whether the second electrical circuit has experienced a related fault that causes the abnormal target electrical parameters based on the electrical status monitoring data of the terminal load of the second electrical circuit in the fault tracing data.

[0042] First, the diagnostic system analyzes the fault tracing data to identify which electrical circuits exhibit abnormal parameters. These circuits displaying abnormal symptoms are considered the first electrical circuit. Because the electrical circuits in the system are connected and driven according to certain logical relationships to achieve the various functions required for train operation, it is highly likely that the abnormal symptoms of multiple circuits within the first electrical circuit are caused by abnormal electrical circuits upstream in the logical control chain.

[0043] The diagnostic system then connects the first electrical circuits that experienced anomalies in series based on the logical control relationships of each electrical circuit in the electrical circuit system, analyzing the upstream and downstream control relationships between them. Logical control relationships mainly include sequential control logic and combinational control logic. The former includes, for example, switching circuits or associated circuits with interlocking relationships, while the latter includes electrical circuits where multiple independent electrical circuits simultaneously meet triggering conditions. By analyzing the logical control relationships between the first electrical circuits, the diagnostic system can identify one or more second electrical circuits that are at the upstream of the control logic and are the starting point of the abnormal disturbances in multiple electrical circuits.

[0044] For example, a fault in the coil circuit of a source relay K1 causes the contactor KM1 it controls to lose power, which in turn prevents the two motors M1 and M2 controlled by KM1 from starting. In this example, the electrical circuits containing K1, KM1, M1, and M2 are all the first electrical circuits where abnormalities occur, but the root cause of the abnormalities in KM1, M1, and M2 all points to the same upstream electrical circuit, namely the electrical circuit containing relay K1, which is the second electrical circuit.

[0045] Finally, the diagnostic system analyzes the monitoring data belonging to the second electrical circuit in the fault tracing data to determine whether a fault has occurred in the second electrical circuit that caused the abnormal disturbance.

[0046] To quickly and accurately determine whether an electrical circuit has malfunctioned, a preferred embodiment of the present invention involves analyzing the electrical condition monitoring data of the terminal load of the second electrical circuit in the fault tracing data to determine whether the second electrical circuit has experienced a fault that causes abnormal target electrical parameters. This includes: determining the pull-in time and overtravel time of the terminal load of the second electrical circuit based on the electrical condition monitoring data of the terminal load; comparing the pull-in time and overtravel time of the terminal load of the second electrical circuit with a preset degradation trajectory model to obtain a comparison result; and determining whether the terminal load of the second electrical circuit has experienced aging or a fault that causes abnormal target electrical parameters based on the comparison result. The degradation trajectory model is a model established based on historical operating data of similar terminal loads, characterizing the variation of their pull-in time and overtravel time with working time or number of operations.

[0047] Taking a terminal load relay as an example, during the relay's operation, arc erosion and material transfer caused by contact arc discharge continuously damage the contact performance. Material transfer from the contact to the opposite electrode alters the surface morphology and contact gap of the contact. This process is gradual, reflecting the cumulative effect of arc erosion on the contact and demonstrating the degradation of contact performance. Overtravel is the distance moved by the moving or stationary contact after the relay contacts close. Throughout the process, contact wear leads to changes in contact overtravel and contact gap, which are reflected in changes in overtravel time and pull-in time. A decrease in overtravel results in a decrease in overtravel time, while an increase in contact gap results in an increase in pull-in time.

[0048] The electrical condition monitoring data of the relays extracts time-related characteristic parameters that directly reflect the relay's mechanical performance: pull-in time and overtravel time. These are compared with the expected values ​​of the relay's current on / off time in the degradation trajectory model to obtain the degree of deviation of the pull-in time and overtravel time relative to the degradation trajectory model. The diagnostic system then determines whether the terminal load is aging or faulty based on the comparison results: When the deviation is slight (within the confidence interval threshold), the system considers it normal performance fluctuation, records it but does not make a fault or aging judgment, and does not issue an alarm. When the deviation is significant (exceeding the relay's health threshold), the system determines accelerated performance degradation and deviation from the normal aging trajectory. The system issues a warning, indicating that the relay's health is deteriorating and requires close monitoring for predictive maintenance. When the deviation is severe or there is a sudden parameter change (exceeding the fault threshold), the system determines a fault has been triggered and issues a fault alarm.

[0049] To accurately extract the pull-in time and overtravel time of the terminal load using the voltage data, voltage data, and their corresponding on / off times of the terminal load, a preferred embodiment of the present invention involves determining the pull-in time and overtravel time of the terminal load of the second electrical circuit based on the electrical status monitoring data of the terminal load of the second electrical circuit. This includes: plotting waveform curves of the voltage and current of the terminal load of the second electrical circuit changing with the on / off time based on the voltage data, voltage data, and their corresponding on / off times of the terminal load of the second electrical circuit, wherein the electrical status monitoring data of the terminal load of the second electrical circuit includes the voltage data, current data, and their corresponding on / off times of the terminal load of the second electrical circuit; and determining the pull-in time and overtravel time of the terminal load of the second electrical circuit based on the waveform curves.

[0050] For example, Figure 2This diagram illustrates the waveforms of coil current and contact voltage when a relay is energized. In the diagram, t0 represents the time the relay coil is energized, t1 represents the time the contacts close, t2 represents the time the relay armature is fully engaged, the time from t1 to t2 is the overtravel time, and the time from t0 to t1 is the engagement time. Sensitive parameters are calculated using these time points, and the relay state is determined by the changes in these parameters. Engagement time: The time from when the coil is energized to when the relay contacts make contact when the normally open contacts are open, i.e., t1–t0. Overtravel time: The time from when the coil is energized to when the relay moving contact first contacts the normally open contact, to when the armature is fully engaged, t2–t1.

[0051] To accurately model the degradation pattern of the terminal load and improve the accuracy of subsequent diagnosis, a preferred embodiment of the present invention includes, before comparing the pull-in time and overtravel time of the terminal load in the second electrical circuit with the degradation trajectory of the terminal load in the preset degradation trajectory model, the following steps are also included: collecting historical electrical condition monitoring data of the terminal load in multiple electrical circuits; performing data preprocessing on the historical electrical condition monitoring data; extracting feature data of the pull-in time and overtravel time of the terminal load from the historical electrical condition monitoring data; processing the feature data using wavelet analysis; and establishing a degradation trajectory model based on the feature data using regression analysis.

[0052] The diagnostic system collects historical electrical condition monitoring data of the terminal loads of various electrical circuits in the subway system. For example, it collects the full lifecycle data of relays in various electrical circuits of the subway system, from brand new to completely aged. Then, the historical electrical condition monitoring data is preprocessed, such as filtering, noise reduction, and data augmentation.

[0053] For similar types of terminal loads, the most representative feature data reflecting their degradation is extracted from historical electrical condition monitoring data. For example, for relays and contactors, this includes engagement time and overtravel time; for connecting components, it includes resistance. Wavelet analysis is used to process the feature data, and regression analysis is used to establish a regression model related to the feature data, resulting in a degradation trajectory model for the terminal load. Wavelet analysis can extract more sensitive, richer, and more interference-resistant feature data from a large amount of data, serving as input for subsequent regression analysis modeling and assisting in building a more accurate and stable model. Regression analysis can then be used to find the optimal curve that best fits all feature data points as the degradation trajectory model.

[0054] This invention intelligently groups other abnormal disturbances of the same signal occurring in the initial stage of a system anomaly into a single abnormal disturbance event for continuous recording. This effectively avoids data fragmentation, generating a complete and coherent data file of the initial transient process of the fault, greatly reducing invalid data redundancy and providing a high-quality data foundation for subsequent analysis. After the system enters a relatively stable oscillation mid-term following anomaly, recording of new disturbances of the same type occurring during this period is restarted. This allows for timely capture of these new disturbances with time intervals, avoiding the possibility of neglecting new similar events due to recording previous events, as is possible in traditional models. This effectively prevents the omission of fault information due to a rigid recording mechanism, ensuring the integrity of fault tracing data. By setting differentiated response rules for the same signal disturbance in different periods after a system anomaly, the correlation of abnormal disturbance events is intelligently determined. This ensures the integrity of abnormal disturbance recording while avoiding data fragmentation and duplication, significantly improving the efficiency and quality of abnormal disturbance data recording. Consequently, this ensures that subsequent fault tracing can be performed quickly and accurately, while saving storage and computing resources.

[0055] like Figure 3 As shown, the electrical circuit fault diagnosis device of the present invention can be configured in an electronic device, including a server or a terminal. The electrical circuit fault diagnosis device 300 includes: Monitoring module 301 is used to monitor the electrical status parameters of the terminal load of each electrical circuit; The recording module 302 is configured to, when a first abnormal disturbance occurs in the electrical status parameters of a target electrical parameter in any electrical circuit terminal load, if no other abnormal disturbance occurs in the target electrical parameter during a first time period and a second time period after the first abnormal disturbance occurs, or if other abnormal disturbance occurs in the target electrical parameter during the first time period after the first abnormal disturbance occurs, record the first monitoring data of the target electrical parameter of each electrical circuit terminal load during the target time period before and after the first abnormal disturbance as fault tracing data of the target electrical parameter abnormality; if a second abnormal disturbance occurs in the target electrical parameter during a second time period after the first abnormal disturbance occurs, record the second monitoring data of the target electrical parameter of each electrical circuit terminal load during the target time period before and after the first and second abnormal disturbances as fault tracing data of the target electrical parameter abnormality, wherein the second time period is after the first time period; Analysis module 303 is used to determine the electrical circuits that are related to the abnormality of the target electrical parameters based on the fault tracing data.

[0056] Furthermore, when monitoring the electrical status parameters of the terminal load of each electrical circuit, the monitoring module 301 specifically collects the voltage, current and corresponding on / off times of the terminal load by means of voltage probes and current probes installed in the terminal load of each electrical circuit. The terminal load includes relays and contactors.

[0057] Furthermore, the first time period is within 100ms after the occurrence of the abnormal disturbance, the second time period is from 100ms after the occurrence of the abnormal disturbance to 1s, and the target time period is within 100ms before the occurrence of the abnormal disturbance and within 100ms after the occurrence of the abnormal disturbance.

[0058] Furthermore, when analyzing the relevant faulty electrical circuits that cause abnormal target electrical parameters based on the fault tracing data, the analysis module 303 is specifically used to determine the first electrical circuit in which the target electrical parameters of the terminal load are abnormal based on the fault tracing data; to determine the second electrical circuit in the first electrical circuit that is the source of the abnormal target electrical parameters based on the logical control relationship between the first electrical circuits; and to analyze whether the second electrical circuit has experienced a relevant fault that causes abnormal target electrical parameters based on the electrical status monitoring data of the terminal load of the second electrical circuit in the fault tracing data.

[0059] Furthermore, when the analysis module 303 analyzes whether the second electrical circuit has experienced a related fault that causes abnormal target electrical parameters based on the electrical status monitoring data of the terminal load of the second electrical circuit in the fault tracing data, it specifically determines the pull-in time and overtravel time of the terminal load of the second electrical circuit based on the electrical status monitoring data of the terminal load of the second electrical circuit; compares the pull-in time and overtravel time of the terminal load of the second electrical circuit with a preset degradation trajectory model to obtain the comparison result; and determines whether the terminal load of the second electrical circuit has experienced aging or a fault that causes abnormal target electrical parameters based on the comparison result. Among them, the degradation trajectory model is a model established based on the historical operating data of similar terminal loads to characterize the change law of its pull-in time and overtravel time with working time or number of operations.

[0060] Furthermore, the electrical status monitoring data of the terminal load of the second electrical circuit includes the voltage data, current data and corresponding on / off time of the terminal load of the second electrical circuit. When determining the pull-in time and overtravel time of the terminal load of the second electrical circuit based on the electrical status monitoring data of the terminal load of the second electrical circuit, the analysis module 303 is specifically used to plot the waveform curves of the voltage and current of the terminal load of the second electrical circuit changing with the on / off time based on the voltage data of the terminal load of the second electrical circuit and its corresponding on / off time; and to determine the pull-in time and overtravel time of the terminal load of the second electrical circuit based on the waveform curves.

[0061] Furthermore, the electrical circuit fault diagnosis device also includes a modeling module 304, which is used to collect historical electrical condition monitoring data of the terminal loads in multiple electrical circuits before comparing the pull-in time and overtravel time of the terminal load of the second electrical circuit with the degradation trajectory of the terminal load in the preset degradation trajectory model. The module preprocesses the historical electrical condition monitoring data, extracts feature data of the pull-in time and overtravel time of the terminal load from the historical electrical condition monitoring data, processes the feature data using wavelet analysis, and establishes a degradation trajectory model based on the feature data using regression analysis.

[0062] Figure 3 The electrical circuit fault diagnosis device shown can be used to implement the technical solution of the above method embodiment. Its implementation principle and technical effect are similar, and will not be described again here.

[0063] Figure 4 The illustrated electronic device can execute the processing flow provided by the electrical circuit fault diagnosis method. The electronic device 400 includes a memory 401, a processor 402, a computer program, and a communication interface 403. The computer program is stored in the memory 401 and configured to be executed by the processor 402 using the electrical circuit fault diagnosis method described above. In a particular embodiment, the memory 401 may be a non-volatile solid-state memory. In a particular embodiment, the memory 401 includes a read-only memory (ROM).

[0064] The present invention also provides a computer-readable storage medium having a computer program stored thereon, the computer program being executed by a processor to implement the electrical circuit fault diagnosis method described in the above embodiments. The storage medium may be a non-volatile / non-transitory computer-readable storage medium.

[0065] It should be noted that in this article, relational terms such as “first” and “second” are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations.

[0066] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. An electric circuit failure diagnosis method characterized by comprising: The method comprises the following steps: monitoring electrical state parameters of terminal loads of each electrical circuit; when a first abnormal disturbance occurs in a target electrical parameter among the electrical state parameters of the terminal loads of any electrical circuit, if no other abnormal disturbance occurs in the target electrical parameter within a first time period and a second time period after the first abnormal disturbance, or if another abnormal disturbance occurs in the target electrical parameter within the first time period after the first abnormal disturbance, recording first electrical state monitoring data of the terminal loads of each electrical circuit within a target time period before and after the first abnormal disturbance as fault source data of the abnormality of the target electrical parameter; if a second abnormal disturbance occurs in the target electrical parameter within the second time period after the first abnormal disturbance, recording the first electrical state monitoring data and second electrical state monitoring data of the terminal loads of each electrical circuit within a target time period before and after the second abnormal disturbance as the fault source data of the abnormality of the target electrical parameter, wherein the second time period is after the first time period; analyzing a related fault electrical circuit causing the abnormality of the target electrical parameter according to the fault source data.

2. The electric circuit failure diagnosis method according to claim 1, characterized by, The monitoring of the electrical state parameters of the terminal loads of each electrical circuit comprises the following steps: collecting voltage, current and their corresponding on-off time of the terminal loads through voltage probes and current probes installed in the terminal loads of each electrical circuit, wherein the terminal loads comprise relays and contactors.

3. The electric circuit fault diagnostic method according to claim 1, characterized by, The first time period is within 100 ms after the occurrence of the abnormal disturbance, the second time period is within 1 s after 100 ms after the occurrence of the abnormal disturbance, and the target time period is within 100 ms before the occurrence of the abnormal disturbance and within 100 ms after the occurrence of the abnormal disturbance.

4. The electric circuit fault diagnostic method according to claim 1, characterized by, The analysis of the related fault electrical circuit causing the abnormality of the target electrical parameter according to the fault source data comprises the following steps: determining a first electrical circuit in which the abnormality of the target electrical parameter of the terminal loads occurs according to the fault source data; determining a second electrical circuit that is a source of the abnormality of the target electrical parameter among the first electrical circuits according to a logical control relationship between the first electrical circuits; analyzing whether the second electrical circuit has caused the abnormality of the target electrical parameter according to the electrical state monitoring data of the terminal loads of the second electrical circuit in the fault source data.

5. The electric circuit fault diagnostic method according to claim 4, characterized by, The analysis of whether the second electrical circuit has caused the abnormality of the target electrical parameter according to the electrical state monitoring data of the terminal loads of the second electrical circuit in the fault source data comprises the following steps: determining the attraction time and overtravel time of the terminal loads of the second electrical circuit according to the electrical state monitoring data of the terminal loads of the second electrical circuit; comparing the attraction time and overtravel time of the terminal loads of the second electrical circuit with a preset degradation trajectory model to obtain a comparison result; determining whether the terminal loads of the second electrical circuit have caused aging or failure leading to the abnormality of the target electrical parameter according to the comparison result. The degradation trajectory model is established according to historical operation data of the terminal load of the same type terminal, and represents the change rule model of the attraction time and the over-travel time with the working time or the operation times.

6. The electric circuit fault diagnostic method according to claim 5, characterized by, The electrical state monitoring data of the terminal load of the second electrical circuit includes voltage data, current data and corresponding on-off time of the terminal load of the second electrical circuit. The determination of the attraction time and the over-travel time of the terminal load of the second electrical circuit according to the electrical state monitoring data of the terminal load of the second electrical circuit includes: According to the voltage data, current data and corresponding on-off time of the terminal load of the second electrical circuit, a waveform curve of the voltage and current of the terminal load of the second electrical circuit with the on-off time is drawn; According to the waveform curve, the attraction time and the over-travel time of the terminal load of the second electrical circuit are determined.

7. The electric circuit fault diagnostic method according to claim 5, characterized by, Before the comparison of the attraction time and the over-travel time of the terminal load of the second electrical circuit with the degradation trajectory of the terminal load in the preset degradation trajectory model, the method further includes: Collecting historical electrical state monitoring data of the terminal load in multiple electrical circuits, and pre-processing the historical electrical state monitoring data; Extracting feature data of the attraction time and the over-travel time of the terminal load in the historical electrical state monitoring data; Processing the feature data by using wavelet analysis; Using regression analysis to establish the degradation trajectory model according to the feature data.

8. An electric circuit failure diagnosis apparatus characterized by comprising: The method includes: A monitoring module for monitoring electrical state parameters of the terminal load of each electrical circuit; A recording module for, when a first abnormal disturbance of a target electrical parameter occurs in the electrical state parameters of the terminal load of any electrical circuit, recording first monitoring data of the target electrical parameter of the terminal load of each electrical circuit in a target time period before and after the first abnormal disturbance as fault source data of the abnormality of the target electrical parameter, if no other abnormal disturbance of the target electrical parameter occurs in a first time period and a second time period after the first abnormal disturbance, or if other abnormal disturbance of the target electrical parameter occurs in the first time period after the first abnormal disturbance; If a second abnormal disturbance of the target electrical parameter occurs in the second time period after the first abnormal disturbance, recording the first monitoring data and second monitoring data of the target electrical parameter of the terminal load of each electrical circuit in a target time period before and after the second abnormal disturbance as fault source data of the abnormality of the target electrical parameter, wherein the second time period is after the first time period; An analysis module for determining an electrical circuit related to the abnormality of the target electrical parameter according to the fault source data.

9. An electronic device, comprising: A memory and a processor, wherein the memory stores a computer program, and when the computer program is executed by the processor, the method of any one of claims 1-7 is implemented.

10. A computer-readable storage medium, characterized in that, A program instruction is stored thereon, and when the program instruction is executed, the method of any one of claims 1-7 is implemented.

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