Fault analysis method for isolation switch of rail transit overhead line system and related equipment

Abstract

The invention relates to the technical field of rail transit, and discloses a fault analysis method for an isolation switch of a rail transit overhead line system and related equipment. A data acquisition module arranged on an isolation knife switch acquires the position state, the air switch state, the opening angle, the closing angle, the motor current, the opening time, the opening time and the contact temperature in the closing process of the isolation knife switch in real time, and then fault reason analysis or fault prediction is performed according to real-time action data of the isolation knife switch. During fault reason analysis, judgment is carried out based on the collected action data and logic judgment rules of different fault reasons so as to determine the fault reasons; during fault prediction, the prediction is realized by analyzing the change trend of the collected action data; the problem that an existing isolation switch fault analysis scheme is low in analysis efficiency and accuracy is solved.

Description

Technical Field

[0001] This application relates to the field of rail transit technology, and in particular to a fault analysis method and related equipment for a rail transit overhead contact line isolating switch. Background Technology

[0002] Intelligent operation and maintenance systems for rail transit have been gradually rolled out, and the main trend for future development is to achieve comprehensive monitoring and maintenance of the rail transit overhead contact system, especially in terms of intelligent fault diagnosis and predictive analysis of contact system status trends for isolating switches. The main function of the isolating switches in the overhead contact system is to introduce electricity from the traction substation into the contact network through the isolating switches, thus providing power to the rail vehicles.

[0003] Currently, while the intelligent operation and maintenance system for rail transit includes fault monitoring and prediction functions to ensure the normal operation of overhead contact line switches, it primarily relies on traditional inspection methods. These methods depend on visual inspection and experience-based assessment by maintenance personnel, or measurement using certain tools. This approach is not only inefficient but also prone to bias, failing to predict the status trend of the switches and thus unable to anticipate potential faults. Summary of the Invention

[0004] This application provides a fault analysis method and related equipment for isolating switches in rail transit catenary, aiming to solve the problems of low analysis efficiency and accuracy in existing fault analysis schemes for isolating switches.

[0005] The first aspect of this application provides a fault analysis method for isolating switches in rail transit overhead contact lines, applied to an intelligent operation and maintenance system for rail transit. The intelligent operation and maintenance system for rail transit includes at least a data acquisition module installed on the isolating switch. The method includes: The system receives real-time action data of the isolating switch collected by the data acquisition module at the current moment. The real-time action data includes: isolating switch position status, circuit breaker status, opening angle, closing angle, motor current, opening time, closing time, and contact temperature during closing. Based on the real-time action data, determine whether the isolating switch has malfunctioned; If a fault occurs, logical judgments are made on the position status of the isolating switch, the status of the circuit breaker, the opening angle, the closing angle, the motor current, the opening time, the closing time, and the contact temperature during closing, respectively, to determine the corresponding fault cause by identifying over-operation, under-operation, and refusal to operate. If no fault occurs, historical action data of the isolating switch at multiple consecutive time points before the current moment are collected, and a set of action data curves of the isolating switch is constructed based on the historical action data and the real-time action data. Analyze the changing trends of each action parameter in the action data curve set, and determine whether the isolating switch is trending towards failure based on the changing trends.

[0006] The second aspect of this application provides a fault analysis device for a rail transit overhead contact line isolating switch, the device comprising: a data acquisition device and a controller, wherein the data acquisition module is disposed on the isolating switch; The data acquisition module is used to collect real-time action data of the isolating switch at the current moment. The real-time action data includes: isolating switch position status, circuit breaker status, opening angle, closing angle, motor current, opening time, closing time, and contact temperature during closing. The controller includes: The judgment module is used to determine whether the isolating switch has malfunctioned based on the real-time action data; The fault analysis module is used to determine the corresponding fault cause by performing logical judgments on the position status of the isolating switch, the status of the circuit breaker, the opening angle, the closing angle, the motor current, the opening time, the closing time, and the contact temperature during closing, based on the position status of the isolating switch, the opening status, the closing angle, the closing angle, the motor current, the opening time, the closing time, and the contact temperature during closing, respectively. The prediction module is used to collect historical action data of the isolating switch at multiple consecutive time points before the current time when it is determined that no fault will occur, and construct an action data curve of the isolating switch based on the historical action data and the real-time action data; analyze the changing trend of each action parameter in the action data curve set, and determine whether the isolating switch is inclined to cause a fault based on the changing trend.

[0007] A third aspect of this application provides an electronic device, comprising: a memory and at least one processor, wherein the memory stores instructions; the at least one processor invokes the instructions in the memory to cause the electronic device to execute the above-described fault analysis method for the contact wire isolating switch of rail transit.

[0008] A fourth aspect of this application provides a computer-readable storage medium storing instructions that, when executed on a computer, cause the computer to perform the aforementioned fault analysis method for the contact wire isolating switch of rail transit.

[0009] The technical solution provided in this application uses a data acquisition module installed on the isolating switch to collect real-time data on the isolating switch's position status, circuit breaker status, opening angle, closing angle, motor current, opening time, closing time, and contact temperature during closing. Then, based on the real-time operating data of the isolating switch, fault cause analysis or fault prediction is performed. In fault cause analysis, the collected action data is compared with logical judgment rules for different fault causes to determine the fault cause. In fault prediction, prediction is achieved by analyzing the changing trends of the collected action data. This application achieves fault analysis and fault prediction by setting logical judgment rules for different fault causes and analyzing data changing trends. Compared with existing solutions, this method has higher fault analysis efficiency, and the prediction accuracy is improved by predicting changes in trends. This allows for early understanding of the switch's status development and early intervention before a fault occurs. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of the first embodiment of the fault analysis method for the contact wire isolating switch in rail transit in this application; Figure 2 This is a schematic diagram of the second embodiment of the fault analysis method for the contact wire isolating switch in rail transit in this application; Figure 3 This is a structural diagram of the data acquisition module in this application; Figure 4 This is a schematic diagram illustrating the causes of the malfunction in this application; Figure 5 This is a schematic diagram of the curves showing the relationship between the tripping rotation angle and the number of tripping cycles in this application; Figure 6 This is a schematic diagram of the curves relating the closing rotation angle to the number of closing cycles in this application; Figure 7 This is a schematic diagram of the current versus number of tripping cycles in this application; Figure 8 This is a schematic diagram of the curves showing the response time for opening and closing versus the number of closing cycles in this application; Figure 9 This is a schematic diagram of the contact temperature versus closing frequency curve in this application; Figure 10 This is a schematic diagram of an embodiment of the fault analysis device for the overhead contact line isolating switch in this application; Figure 11 This is a schematic diagram of one embodiment of the electronic device in this application. Detailed Implementation

[0011] This application provides a fault analysis method and related equipment for isolating switches of rail transit catenary. It is used to achieve fault analysis and fault prediction by setting logical judgment rules for different fault causes and analyzing data change trends. Compared with existing solutions, this method has higher fault analysis efficiency and improves the accuracy of prediction by predicting changes.

[0012] The terms “first,” “second,” “third,” “fourth,” etc. (if present) in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a particular order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments described herein can be implemented in a sequence other than that illustrated or described herein. Furthermore, the terms “comprising” or “having,” and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0013] See Figure 1 This application provides a fault analysis method for isolating switches in rail transit overhead contact lines. This method is applied to an intelligent operation and maintenance system for rail transit, which includes at least a data acquisition module installed on the isolating switch. The method includes the following steps: 101. Receive the real-time action data of the isolating switch collected by the data acquisition module at the current moment. The real-time action data includes: isolating switch position status, circuit breaker status, opening angle, closing angle, motor current, opening time, closing time, and contact temperature during closing.

[0014] It should be noted that the real-time action data obtained here is specifically acquired through real-time monitoring by pre-setting sensors and other devices on the isolating switch that can collect data from different dimensions of the isolating switch.

[0015] Specifically, the data acquisition module includes intelligent components such as a closed auxiliary switch, an open auxiliary switch, circuit breaker auxiliary contacts, a closed angle sensor, an open angle sensor, a current sensor, an open limit switch, a closed limit switch, a temperature and humidity sensor, and a temperature-measuring camera. The core of the data acquisition module is to collect data in real time through these intelligent components and then aggregate it to the data acquisition controller. Specifically, it collects data from each data acquisition module via RS485, network, and other communication methods. Following the logic provided in the following steps, it intelligently diagnoses faults and predicts the health status of the disconnector, while simultaneously sending the results to the system backend for storage and display on the workstation terminal in the system backend. Figure 3 As shown.

[0016] 102. Determine whether the isolating switch has malfunctioned based on real-time action data.

[0017] When determining whether a fault has occurred, a preset threshold method can be used to compare each parameter in the real-time action data with the corresponding preset threshold, and the result of the comparison can be used to determine whether a fault exists.

[0018] It should be noted that the preset threshold here can be understood as a single-dimensional value set by the staff based on maintenance experience. If any parameter in the real-time action data does not meet the corresponding preset threshold, it is determined to be a fault of the isolating switch, and further subsequent steps will be executed.

[0019] 103. If a fault occurs, based on the position status of the isolating switch, the status of the circuit breaker, the opening angle, the closing angle, the motor current, the opening time, the closing time, and the contact temperature during closing, perform logical judgments to determine whether the action is over-extension, under-extension, or refusal to act, and determine the corresponding fault cause.

[0020] In this embodiment, over-position, under-position, and refusal to operate all include both closed and open positions. Therefore, this step first determines whether the isolating switch is closed or open based on its position status. When it is closed, the fault logic corresponding to the closed position (over-position, under-position, or refusal to operate) is selected for judgment. That is, the condition threshold corresponding to the closing fault is selected, and the specific fault type is judged according to the combination logic of the conditions. Similarly, for the open position, the principle is the same as that for the closed position, the only difference being the condition threshold.

[0021] In practical applications, this can also be used to determine the specific fault type based on the fault determination result when judging whether a fault exists, and then select the corresponding fault logic to identify the specific fault cause based on the fault type.

[0022] For example, based on the fault type identification and judgment using real-time action data in step 102, after determining the specific fault type, the corresponding judgment logic is selected from the fault cause judgment logic, and then the specific parameter values ​​in the real-time action data are compared, and the specific fault cause is determined based on the comparison result.

[0023] 104. If no fault occurs, collect historical action data of the isolating switch at multiple consecutive time points before the current moment, and construct an action data curve set of the isolating switch based on the historical action data and real-time action data; analyze the changing trend of each action parameter in the action data curve set, and predict whether the isolating switch will fail at a future time based on the changing trend.

[0024] In this embodiment, if it is determined that there is no fault in the real-time working data of the isolating switch at the current moment, then the historical action data of the isolating switch before the current moment is read. Here, the n actions refer to the action data generated when the isolating switch is controlled to close or open n times. Of course, these n action data should be considered to be at equal intervals. The parameter change trend analysis is performed on the n action data and the action data at the current moment, and the fault of the isolating switch is predicted based on the analyzed change trend.

[0025] In this embodiment, by collecting real-time status data of the isolating switch and identifying fault types and causes based on preset logical judgment rules, the subjectivity and uncertainty of manual judgment are avoided, improving the efficiency and accuracy of fault handling. Furthermore, even when no fault is detected, by collecting and analyzing historical and real-time action data of the isolating switch, an action data curve set is constructed to predict the changing trends of various action parameters. This allows for the early identification of potential fault risks and the implementation of preventative maintenance measures, effectively preventing fault occurrence, extending equipment lifespan, and reducing overall operation and maintenance costs.

[0026] Please see Figure 2-6 This application presents a second embodiment of the fault analysis method for the contact wire isolating switch in rail transit. This embodiment illustrates the method provided in this application in conjunction with a specific scenario, such as... Figure 3 The diagram shows the specific structure of the data acquisition module installed on the isolating switch. This module is actually composed of multiple intelligent components and a data acquisition controller. The intelligent components specifically include a closed auxiliary switch, an open auxiliary switch, a circuit breaker auxiliary contact (power circuit breaker), a closed angle sensor, an open angle sensor, a current sensor (current transformer), an open limit switch, a closed limit switch, a temperature and humidity sensor, and a temperature-measuring camera. Each intelligent component connects to the data acquisition controller via different communication methods. After acquiring data, each intelligent component synchronously uploads it to the data acquisition controller, which then reports it to the system backend for fault analysis. Based on the data acquisition structure provided above, the fault analysis method for this rail transit contact network isolating switch includes the following steps: 201. The data acquisition module collects the real-time action data of the isolating switch at the current moment. The real-time action data includes: isolating switch position status, circuit breaker status, opening angle, closing angle, motor current, opening time, closing time, and contact temperature during closing.

[0027] Specifically, the position state of the isolating switch is determined based on the states of the closing auxiliary switch and the opening auxiliary switch located on the closing and opening contacts of the isolating switch. The position state of the isolating switch includes a closing state and an opening state. For example, when the closing auxiliary switch is on, the state is 1, indicating that it is in the closed position; when the closing auxiliary switch is off, the state is 0, indicating that it is not in the closed position. When the opening auxiliary switch is on, the state is 1, indicating that it is in the opening position; when the opening auxiliary switch is off, the state is 0, indicating that it is not in the opening position.

[0028] The circuit breaker status is determined based on the conduction status of the circuit breaker auxiliary contact located on the drive circuit of the isolating switch. It should be noted that the circuit breaker auxiliary contact is linked with the opening and closing of the circuit breaker. When the circuit breaker is conducting, its status is 1, and when it is disconnected, its status is 0.

[0029] The closing and opening angle sensors, located on the rotating shaft of the isolating switch, collect the rotation angles at the closing and opening positions, respectively. In practical applications, these sensors primarily collect the angles at any position throughout the entire process from opening to closing. The angle states are categorized according to their range values ​​as follows: Transpositional overshoot: θ≤-2°; Normal quantile angle: -2 < θ ≤ 2°; Abnormal angles at quantiles: 2 < θ ≤ 10°; Non-separation and non-conclusion angle: 10<θ≤80°; Abnormal angle of conjunction: 80 < θ ≤ 88°; Normal azimuth angle: 88 < θ ≤ 92°; Interval angle: θ > 92°.

[0030] Real-time operating current is collected using a current sensor located in the motor coil of the isolating switch; in practical applications, it is classified into the following categories according to the different ranges of motor current magnitude: No current: i = 0A; No-load current: 0 < i ≤ 1A; Normal current: 1 < i ≤ 2A; Carbide current: 3 < i ≤ 5A; Stalled rotor current: 5 < i ≤ 7 A; Short-circuit current: i > 7A.

[0031] The opening and closing times are collected based on the open / close contacts of the isolating switch and the open / close limit switches on the drive circuit. These limit switches control the motor's start and stop, and the response time is precisely the time interval between these starts and stops. For example, the open limit switch is in state 1 when it is on and state 0 when it is off. The close limit switch is in state 1 when it is on and state 0 when it is off. The closing time is calculated as the absolute value of the time t1 when the controller collects the open limit switch state 0 minus the time t2 when the close limit switch state 1. The opening time is calculated as the absolute value of the time t3 when the controller collects the close limit switch state 0 minus the time t4 when the open limit switch state 1. The state of the isolating switch can be determined based on the response time t, for example: Not started: t=0; The time is relatively short: 0 < t ≤ 3 s; Normal time: 3 < t ≤ 4 s; The time is relatively long: 4 < t ≤ 6 s; Time before arrival: t > 6s.

[0032] The ambient humidity at the location of the isolating switch is collected using temperature and humidity sensors. In other words, the sensors are used to collect information on the humidity levels at the site. When the ambient humidity is ≥90%, it is considered a high humidity state. Conversely, it is considered a normal state. For example, S≥90% indicates high humidity, and S<90% indicates normal humidity.

[0033] The temperature is measured by a temperature-sensing camera to identify the temperature of the isolating switch contacts when they are in the closed position. This means the camera monitors the surface temperature of the contacts in real time and calculates the average temperature from 6:30 AM to 11:30 PM. A surface temperature ≤ 50K is considered normal. Conversely, a surface temperature > 50K indicates a higher temperature. 1K = contact surface temperature (°C) + ambient temperature (°C). Generally, W ≤ 50K represents normal, and W > 50K represents a higher temperature.

[0034] 202. Determine whether the isolating switch has malfunctioned based on real-time action data.

[0035] In this step, when determining whether a fault has occurred, specifically when determining that a fault has occurred, it also includes identifying the type of fault, and performing step 203 or 204 below according to different types.

[0036] This embodiment classifies fault types into closing abnormalities and opening abnormalities; closing abnormalities include three types: closing over-position, closing incompletely, and closing failure; opening abnormalities include three types: opening over-position, opening incompletely, and opening failure. Figure 4The diagram shows the fault types, and corresponding fault judgment logic is designed for each fault type. That is to say, after determining that a fault has occurred, this step continues to determine whether it is a closing fault or a tripping fault, and then continues the inspection to determine the most specific fault type. Further, steps 303 or 304 are executed.

[0037] 203. If a fault occurs and the isolating switch is in the closed position, based on the isolating switch position, circuit breaker status, closing angle, motor current, closing time, and contact temperature during closing, perform logical judgments for over-closing, under-closing, and failure to close to determine the corresponding cause of the closing fault.

[0038] In this embodiment, if the isolating switch is in the closed position and the fault type is over-closing, it is determined whether the position status of the isolating switch, the state of the circuit breaker, the closing angle, the motor current, the closing time, and the contact temperature during closing all meet the first closing fault condition; if all conditions are met, the isolating switch is determined to have a closing limit switch position offset fault; or, it is determined whether the position status of the isolating switch, the state of the circuit breaker, the closing angle, the motor current, the closing time, and the contact temperature during closing all meet the second closing fault condition; if all conditions are met, the isolating switch is determined to have a closing limit switch failure fault. The first closing fault condition is that the position state of the isolating switch and the state of the circuit breaker are both first state values, the closing angle is greater than a first angle value, the motor current is within a first current range, the closing time is within a first time range, and the contact temperature during closing is greater than a first temperature value. The second closing fault condition is that the position state of the isolating switch and the state of the circuit breaker are both first state values, the closing angle is greater than a first angle value, the motor current is within a second current range, the closing time is greater than the upper boundary value of the first time range, and the contact temperature during closing is greater than a first temperature value.

[0039] In practical applications, over-closing occurs when the isolating switch exceeds its normal closing angle range during the closing operation. Over-closing can cause mechanical impact to the switch mechanism, and the moving contact extends beyond the contact area of ​​the stationary contact, reducing the contact area and consequently decreasing the switch's current-carrying capacity and increasing the contact surface temperature. Therefore, this application constructs corresponding judgment logic based on data generated from learning from practical experience to achieve automated judgment.

[0040] The main causes of over-extension closing are misalignment of the closing limit switch and failure of the closing limit switch itself. The data displayed by the various detection modules are different in these two situations. The two logics are set as follows: The fault is caused by the logic for determining the position offset of the closed limit switch: Condition 1: When the closed auxiliary switch is in state 1 and the open auxiliary switch is in state 0, it means that the disconnector is in the closed state. Condition 2: The circuit breaker status of the motor circuit is 1, indicating that the motor circuit is normal and in electric operation mode. Condition 3: If the detected rotation angle is >92°, it indicates that there has been an over-extension deviation in the rotation angle during closing. Condition 4: Motor current 1 < i ≤ 2A, indicating that this is the normal closing current value and there is no motor stall or other abnormal situation; Condition 5: The closing reaction time is 4 < t ≤ 6s, which indicates that the closing time is too long. This is because the closing limit switch moves, resulting in a later acquisition time t2, which makes t larger. Condition 6: If the contact temperature W > 50K, it indicates that the contact area between the moving and stationary contacts has decreased due to the over-extension of the closing circuit, resulting in a larger temperature rise. When conditions one through six above (i.e., the first closing fault condition) are met simultaneously, it is determined that the closing over-extension is caused by the position deviation of the closing limit switch.

[0041] The logic for determining the cause of the fault as a failure of the closed limit switch is as follows: Condition 1: When the closed auxiliary switch is in state 1 and the open auxiliary switch is in state 0, it means that the disconnector is in the closed state. Condition 2: The circuit breaker status of the motor circuit is 1, indicating that the motor circuit is normal and in electric operation mode. Condition 3: If the detected rotation angle is >92°, it indicates that there has been an over-extension deviation in the rotation angle during closing. Condition 4: The motor current 5 < i ≤ 7A indicates that the motor is stalled due to the failure of the contact limit switch. Condition 5: The closing reaction time t > 6s indicates that due to the failure of the closing limit switch, time t2 cannot be collected, making t infinite; Condition 6: If the contact temperature W > 50K, it indicates that the contact area between the moving and stationary contacts has decreased due to over-extension during closing, resulting in a larger temperature rise.

[0042] When conditions one through six above (i.e., the second closing fault conditions) are met simultaneously, it is determined that the closing over-extension is caused by the failure of the closing limit switch.

[0043] In another embodiment, if the isolating switch is in the closed position and the fault type is incomplete closing, it is determined whether the isolating switch position state, the circuit breaker state, the closing angle, the motor current, the closing time, and the contact temperature during closing all meet the third closing fault condition; if all are met, the isolating switch is determined to be in a position offset fault of the closed limit switch; wherein the third closing fault condition is that the isolating switch position state and the circuit breaker state are in the first state value, the closing angle is within the first angle range, the motor current is within the first current range, the closing time is within the second time range, and the contact temperature during closing is greater than the first temperature value.

[0044] In practical applications, incomplete closing actually occurs when the isolating switch, during the closing operation, fails to reach the normal closing angle range when it is in the closed position. This results in insufficient contact between the moving and stationary contacts, reducing the contact area, decreasing the switch's current-carrying capacity, and increasing the contact surface temperature. Therefore, this application addresses this issue by setting appropriate judgment logic.

[0045] The main reason for incomplete closing is the misalignment of the closing limit switch, causing the moving contact of the disconnector to stop moving prematurely. The logical judgment condition for this fault type is: Condition 1: When the closed auxiliary switch is in state 1 and the open auxiliary switch is in state 0, it means that the disconnector is in the closed state. Condition 2: The circuit breaker status of the motor circuit is 1, indicating that the motor circuit is normal and in electric operation mode. Condition 3: If the detected rotation angle is 80 < θ ≤ 88°, it indicates that the switch is not fully engaged due to insufficient rotation angle. Condition 4: Motor current 1 < i ≤ 2A, indicating that this is the normal closing current value and there is no motor stall or other abnormal situation.

[0046] Condition 5: The closing reaction time is 0 < t ≤ 3s, which indicates that the closing time is too short. This is because the closing limit switch moves, causing the time t2 to be collected too early, which makes t smaller.

[0047] Condition 6: If the contact temperature W > 50K, it indicates that the circuit breaker is not fully closed because the contact area between the moving and stationary contacts has decreased, resulting in a larger temperature rise.

[0048] When conditions one through six above (i.e., the third closing fault condition) are met simultaneously, it is determined that the failure to close the circuit is due to the offset of the closing limit switch position.

[0049] In another embodiment, if the isolating switch is in the closed position and the fault type is closing failure, it is determined whether the isolating switch position state, the circuit breaker state, the closing angle, the motor current, and the closing time all meet the fourth closing fault condition; if all are met, the isolating switch is determined to have an initial position abnormality fault; the fourth closing fault condition is that the isolating switch position state is the second state value, the circuit breaker state is the first state value, the closing angle is within the second angle range, and the motor current and the closing time are 0. Alternatively, determine whether the position state of the isolating switch, the state of the circuit breaker, the closing angle, the motor current, and the closing time all meet the fifth closing fault condition; if all are met, then determine that the isolating switch has a fault of disengagement of the switch contact from the electric mechanism transmission; the fifth closing fault condition is that the position state of the isolating switch and the state of the circuit breaker are at the first state value, the closing angle is within the third angle range, the motor current is within the third current range, and the closing time is within the third time range; Alternatively, determine whether the position state of the isolating switch, the state of the circuit breaker, the closing angle, the motor current, and the closing time all meet the sixth closing fault condition; if all are met, then determine that the isolating switch is a motor burnout fault; the sixth closing fault condition is that the position state of the isolating switch is the second state value, the state of the circuit breaker is the first state value, the closing angle is within the third angle range, the motor current is greater than the first current value, and the closing time is 0.

[0050] In practical applications, failure to close the circuit breaker actually refers to a situation where the disconnector mechanism does not move at all during the closing operation. The main causes of this situation include abnormal initial position, disengagement of the disconnector contacts from the electric drive mechanism, and burnout of the motor itself. The corresponding troubleshooting logic for each fault cause is as follows: Logic for detecting anomalies in the initial position: Condition 1: When the closed auxiliary switch is in state 0 and the open auxiliary switch is in state 0, it means that the disconnector is neither open nor closed at this time. Condition 2: The circuit breaker status of the motor circuit is 1, indicating that the motor circuit is normal and in electric operation mode. Condition 3: If the detected rotation angle is 10 < θ ≤ 80°, it indicates that the rotation angle has entered a state of neither separation nor combination. Condition 4: Motor current i = 0A, indicating that the motor is not started at this time.

[0051] Condition 5: The response time for closing the circuit breaker is t=0s, indicating that the motor has not started at this time.

[0052] When conditions one through five above (i.e., the fourth closing fault condition) are met simultaneously, it is determined that the failure to close is due to an abnormal initial position.

[0053] Logic for determining abnormal disengagement of the transmission mechanism: Condition 1: The state of the closed auxiliary switch is 1 and the state of the open auxiliary switch is 0, indicating that the auxiliary contact of the mechanism has been activated and sent a signal that it is in the closed state. Condition 2: The circuit breaker status of the motor circuit is 1, indicating that the motor circuit is normal and in electric operation mode. Condition 3: If the detected rotation angle is -2 < θ ≤ 2°, it means that the switch angle detection is still in the split position; Condition 4: The motor current 0 < i ≤ 1A indicates that the motor current is too low and the motor is in an unloaded state.

[0054] Condition 5: The response time for closing the circuit breaker is 3 < t ≤ 4 s, indicating that the motor mechanism has rotated to the correct position normally.

[0055] When conditions one through five above (i.e., the fifth closing fault condition) are met simultaneously, it is determined that the failure to close is due to the transmission mechanism disengaging.

[0056] The logic for determining if a motor has burned out: Condition 1: When the closed auxiliary switch is in state 0 and the open auxiliary switch is in state 1, it means that the mechanism is still in the open position and has not been started. Condition 2: The circuit breaker status of the motor circuit changes from 1 to 0, indicating that the circuit breaker tripped due to a short circuit caused by the burnt-out coil inside the motor. Condition 3: If the detected rotation angle is -2 < θ ≤ 2°, it means that the switch angle detection is still in the split position; Condition 4: Motor current i > 7A, indicating that a short-time short-circuit current occurs in the motor at this time.

[0057] Condition 5: The response time for closing the circuit breaker is i=0A, indicating that the motor has not started at this time.

[0058] When conditions one through five (i.e., the sixth closing fault condition) are met simultaneously, it is determined that the failure to close is due to a short circuit and burnout of the internal coil of the motor. Meanwhile, ambient humidity data can be used as a reference but is not included in the condition judgment. This is because most motor burnouts under normal circumstances are related to ambient humidity (except for cases of stalled rotors or severe mechanical jamming leading to coil overheating and burnout).

[0059] 204. If a fault occurs and the isolating switch is in the open position, based on the isolating switch position, circuit breaker status, opening angle, motor current, and opening time, perform logical judgments on over-opening, under-opening, and failure to open to determine the corresponding cause of the opening fault.

[0060] In this embodiment, if the isolating switch is in the open position and the fault type is over-opening, it is determined whether the isolating switch position state, the circuit breaker state, the opening angle, the motor current, and the opening time all meet the first opening fault condition; if all are met, the isolating switch is determined to be in the position offset fault of the closing limit switch; or, it is determined whether the isolating switch position state, the circuit breaker state, the opening angle, the motor current, and the opening time all meet the second opening fault condition; if all are met, the isolating switch is determined to be in the position failure fault of the closing limit switch itself; wherein, the first opening fault condition is that the isolating switch position state and the circuit breaker state are in the first state value, the opening angle is not greater than the second angle value, the motor current is within the first current range, and the opening time is within the first time range; the second opening fault condition is that the isolating switch position state and the circuit breaker state are in the first state value, the opening angle is not greater than the second angle value, the motor current is within the second current range, and the opening time is greater than the upper boundary value of the first time range.

[0061] In practical applications, over-extension of the circuit breaker occurs when the isolating switch is in the open position during a closing operation, exceeding the normal opening angle range. Over-extension can easily cause mechanical impact to the switch mechanism. Therefore, this application constructs corresponding judgment logic based on data generated from learning from work experience to achieve automated judgment.

[0062] The main causes of over-closing are displacement of the limit switch position and failure of the limit switch itself. The data displayed by the various detection modules are different in these two situations. The following two logics are set for this: Logic for determining the position offset of the limit switch: Condition 1: When the open auxiliary switch is in state 1 and the closed auxiliary switch is in state 0, it means that the disconnector is in the open state. Condition 2: The circuit breaker status of the motor circuit is 1, indicating that the motor circuit is normal and in electric operation mode. Condition 3: If the detected rotation angle θ ≤ -2°, it indicates that the angle has deviated due to over-extension. Condition 4: Motor current 1 < i ≤ 2A, indicating that this is the normal tripping current value and there is no motor stall or other abnormal situation.

[0063] Condition 5: The reaction time of the circuit breaker tripping is 4 < t ≤ 6s, which indicates that the tripping time is too long. This is because after the tripping limit switch moves, the time t4 is collected later, which makes t larger.

[0064] When conditions one through five above (i.e., the first tripping fault conditions) are met simultaneously, it is determined that the tripping over-position is caused by the offset of the tripping limit switch position.

[0065] Logic for determining the failure of a limit switch: Condition 1: When the open auxiliary switch is in state 1 and the closed auxiliary switch is in state 0, it means that the disconnector is in the open state. Condition 2: The circuit breaker status of the motor circuit is 1, indicating that the motor circuit is normal and in electric operation mode. Condition 3: If the detected rotation angle θ ≤ -2°, it indicates that the angle has deviated due to over-extension. Condition 4: The motor current 5 < i ≤ 7A indicates that the motor is stalled due to the failure of the limit switch.

[0066] Condition 5: The closing reaction time t > 6s indicates that due to the failure of the trip limit switch, the time t4 cannot be collected, making t infinite.

[0067] When conditions one through five above (i.e., the second tripping fault conditions) are met simultaneously, it is determined that the tripping over-extension is caused by the failure of the tripping limit switch.

[0068] In another embodiment, if the isolating switch is in the open position and the fault type is incomplete opening, it is determined whether the isolating switch position state, the circuit breaker state, the opening angle, the motor current, and the opening time all meet the third opening fault condition; if all are met, it is determined that the isolating switch is in the closed position limit switch position offset fault; the third opening fault condition is that the isolating switch position state and the circuit breaker state are in the first state value, the opening angle is within the fourth angle range, the motor current is within the first current range, and the opening time is within the second time range.

[0069] In practical applications, incomplete opening of the isolating switch actually occurs when the isolating switch, during its opening operation, fails to reach the normal opening angle range, thus reducing the safe electrical distance between the isolating switch contacts. Therefore, detecting incomplete opening through intelligent and automated methods requires well-defined judgment logic. The main cause of incomplete opening is the misalignment of the isolating limit switch, causing the moving contact of the isolating switch to stop moving prematurely. The logical judgment condition is: Condition 1: When the open auxiliary switch is in state 1 and the closed auxiliary switch is in state 0, it means that the disconnector is in the open state. Condition 2: The circuit breaker status of the motor circuit is 1, indicating that the motor circuit is normal and in electric operation mode. Condition 3: If the detected rotation angle 2 < θ ≤ 10°, it indicates that the circuit breaker is not fully engaged due to the rotation angle issue. Condition 4: Motor current 1 < i ≤ 2A, indicating that this is the normal tripping current value and there is no motor stall or other abnormal situation.

[0070] Condition 5: The closing reaction time is 0 < t ≤ 3s, which indicates that the opening time is too short. This is because the opening limit switch moves, causing the time t4 to be collected too early, which makes t smaller.

[0071] When conditions one through five above (i.e., the third tripping fault condition) are met simultaneously, it is determined that the tripping failure is due to the position deviation of the tripping limit switch.

[0072] In another embodiment, if the isolating switch is in the open position and the fault type is open failure to operate, it is determined whether the position state of the isolating switch, the state of the circuit breaker, the opening angle, the motor current, and the opening time all meet the fourth opening fault condition; if all are met, the isolating switch is determined to have an initial position abnormality fault; the fourth opening fault condition is that the position state of the isolating switch is the second state value, the state of the circuit breaker is the first state value, the opening angle is within the second angle range, and the motor current and the opening time are 0. Alternatively, determine whether the position state of the isolating switch, the state of the circuit breaker, the opening angle, the motor current, and the opening time all meet the fifth opening fault condition; if all are met, then determine that the isolating switch has a fault of disengagement of the switch contact from the electric mechanism transmission; the fifth opening fault condition is that the position state of the isolating switch and the state of the circuit breaker are at the first state value, the opening angle is within the fifth angle range, the motor current is within the third current range, and the opening time is within the third time range; Alternatively, determine whether the position state of the isolating switch, the state of the circuit breaker, the opening angle, the motor current, and the opening time all meet the sixth opening fault condition; if all are met, then determine that the isolating switch is a motor burnout fault; the sixth opening fault condition is that the position state of the isolating switch is the second state value, the state of the circuit breaker is the first state value, the opening angle is within the fifth angle range, the motor current is greater than the first current value, and the opening time is 0.

[0073] In practical applications, failure to open the circuit breaker actually refers to a situation where the disconnector mechanism fails to operate at all during the opening operation. The main causes of this situation include abnormal initial position, disengagement of the disconnector contacts from the electric drive mechanism, and burnout of the motor itself. The corresponding troubleshooting logic for each fault cause is as follows: Logic for detecting anomalies in the initial position: Condition 1: When the open auxiliary switch is in state 0 and the closed auxiliary switch is in state 0, it means that the disconnector is neither open nor closed at this time. Condition 2: The circuit breaker status of the motor circuit is 1, indicating that the motor circuit is normal and in electric operation mode. Condition 3: If the detected rotation angle is 10 < θ ≤ 80°, it indicates that the rotation angle has entered a state of neither separation nor combination. Condition 4: Motor current i = 0A, indicating that the motor is not started at this time.

[0074] Condition 5: The response time for closing the circuit breaker is t=0s, indicating that the motor has not started at this time.

[0075] When conditions one through five above (i.e., the fourth tripping fault condition) are met simultaneously, it is determined that the tripping failure is caused by an abnormal initial position.

[0076] Logic for determining abnormal disengagement of the transmission mechanism: Condition 1: When the open position auxiliary switch is in state 1 and the closed position auxiliary switch is in state 0, it means that the auxiliary contact of the mechanism has been activated and sent a signal that it is in the open position. Condition 2: The circuit breaker status of the motor circuit is 1, indicating that the motor circuit is normal and in electric operation mode. Condition 3: If the detected rotation angle is 88 < θ ≤ 92°, it means that the rotation angle of the switch is still in the closed position and has not moved. Condition 4: The motor current 0 < i ≤ 1A indicates that the motor current is too low and the motor is in an unloaded state.

[0077] Condition 5: The reaction time of the circuit breaker tripping is 3 < t ≤ 4 s, indicating that the motor mechanism has rotated to the correct position normally.

[0078] When conditions one through five above (i.e., the fifth tripping fault condition) are met simultaneously, it is determined that the tripping failure is caused by the transmission mechanism disengaging.

[0079] The logic for determining if a motor has burned out: Condition 1: When the state of the open position auxiliary switch is 0 and the state of the closed position auxiliary switch is 1, it means that the mechanism is still in the closed position and has not been started. Condition 2: The circuit breaker status of the motor circuit changes from 1 to 0, indicating that the circuit breaker tripped due to a short circuit caused by the burnt-out coil inside the motor. Condition 3: If the detected rotation angle is 88° < θ ≤ 92°, it indicates that the rotation angle of the switch is still in the closed position and has not moved. Condition 4: Motor current i > 7A, indicating that a short-time short-circuit current occurs in the motor at this time.

[0080] Condition 5: The reaction time of the circuit breaker tripping is i=0A, indicating that the motor has not started at this time.

[0081] When conditions one through five (i.e., the sixth tripping fault condition) are met simultaneously, it is determined that the tripping failure is due to a short circuit and burnout of the internal coil of the motor. Meanwhile, ambient humidity data can be used as a reference but is not included in the condition determination. This is because most motor burnouts under normal circumstances are related to ambient humidity (except for cases of stalled motors or severe mechanical jamming leading to coil overheating and burnout).

[0082] 205. If no fault occurs, collect historical action data of the isolating switch at multiple consecutive time points before the current time, and construct a set of action data curves of the isolating switch based on the historical action data and real-time action data.

[0083] This step involves collecting data from the data acquisition controller on the angle of the disconnector, motor current, opening and closing time, and contact temperature. Correlation curves are established between the number of actions (n) and the contact angle, motor current, opening and closing time, as well as the contact temperature during closing and the number of operating days. Each parameter corresponds to a separate curve. These data curves display the current status of each component of the disconnector. By analyzing historical data trends, targeted maintenance and upkeep of each component can be performed to prevent malfunctions. The number of actions is determined by collecting data from the auxiliary contacts in the opening and closing positions. A single "1" in the closing position counts as one closing operation, and so on. Similarly, a single "1" in the opening position counts as one opening operation, and so on.

[0084] 206. Calculate the slope of each curve at multiple adjacent time points in the motion data curve set.

[0085] 207. Determine whether the slopes of multiple curves meet the preset conditions.

[0086] In this embodiment, the preset condition is actually a pre-defined boundary condition for judging a fault. Specifically, the slope of the curve corresponding to multiple adjacent time points is obtained by calculating the average angle difference between multiple consecutive adjacent time points in the action data curve set of the opening and closing rotation angle and the opening and closing frequency curve.

[0087] The following explanation uses the determination of the disconnector closing angle as an example. Figure 5 and 6 As shown, the angle value detected for the first action is θ1, and the angle value detected for the second action is θ2. The slope k1 = (θ2 - θ1) / x2 - x1, where θ2 - θ1 is the difference between the two angles, and x2 - x1 = 1 indicates one action. As the number of actions increases, the values ​​of the slope k1, k2, ..., kn are calculated sequentially.

[0088] If the value of (θn-θ1) / xn-xn-1 is greater than 1 or if there are 10 consecutive kn values ​​greater than 0, it indicates that the angle is continuously increasing, and the user will be automatically prompted to adjust the position of the magnetic blow-out switch accordingly. If the value of (θn-θ1) / xn-xn-1 is less than -1 or if there are 10 consecutive instances of kn being less than 0, it indicates that the angle is continuously decreasing, and the user will be automatically prompted to adjust the position of the magnetic blow-out switch accordingly.

[0089] In another embodiment, the slope of the curve corresponding to multiple adjacent time points is obtained by calculating the average current difference between two consecutive adjacent time points in the motor current and the number of opening and closing cycles curve of the action data curve set.

[0090] In practical applications, such as Figure 7 As shown, the current value detected in the first action is i1, and the current value detected in the second action is i2. The slope k1 = (i2 - i1) / x2 - x1, where i2 - i1 is the difference between the two current values, and x2 - x1 = 1, indicating one action. As the number of actions increases, the values ​​of the slope k1, k2, ..., kn are calculated sequentially.

[0091] If the value of (in-i1) / xn-xn-1 is greater than 0.5 or if there are 10 consecutive kn values ​​greater than 0, it indicates that the current has a continuous increasing trend. If the value of (in-i1) / xn-xn-1 is less than -0.5 or if there are 10 consecutive instances of kn being less than 0, it indicates that the current is continuously decreasing, thus automatically prompting the user to adjust the disconnector mechanism.

[0092] In another embodiment, the slope of the curve corresponding to multiple adjacent time points is obtained by calculating the average difference between the reaction time of multiple consecutive adjacent time points in the action data curve set of the opening and closing response time and the number of opening and closing times curve.

[0093] Similarly, such as Figure 8 As shown, the closing time detected by the first action is t1, and the closing time detected by the second action is t2. The slope k1 = (t2 - t1) / x2 - x1, where t2 - t1 is the difference between the two closing times, and x2 - x1 = 1, indicating one action. As the number of actions increases, the values ​​of the slope k1, k2, ..., kn are calculated sequentially.

[0094] If the value of (tn-t1) / xn-xn-1 is greater than 0.5 or if there are 10 consecutive instances of kn being greater than 0, it indicates that the closing time has a continuous increasing trend. If the value of (tn-t1) / xn-xn-1 is less than -0.5 or if there are 10 consecutive instances of kn being less than 0, it indicates that the closing time is decreasing continuously, thus automatically prompting the user to adjust the disconnector mechanism.

[0095] In another embodiment, the slope of the curve corresponding to multiple adjacent time points is obtained by calculating the average temperature difference between the contact temperature and the number of days in the action data curve set.

[0096] Similarly, such as Figure 9 As shown, the temperature measured on the first day is w1, and the temperature measured on the second day is w2. The slope k1 = (w2 - w1) / x2 - x1, where w2 - w1 is the temperature difference between the two days, and x2 - x1 = 1, which is one day. As the number of days increases, the values ​​of the slope k1, k2, ..., kn are calculated sequentially.

[0097] If the value of (wn-w1) / xn-xn-1 is greater than 5 or if there are 10 consecutive kn values ​​greater than 0, it indicates that the temperature is increasing continuously, thus automatically prompting the user to maintain the contacts.

[0098] 208. Based on the judgment results, determine whether the isolating switch is trending towards a fault.

[0099] In this step, if the judgment result is that there are N consecutive curve slopes that meet the preset conditions, then it is determined that the isolating switch is trending towards a fault.

[0100] That is, the average angle difference, the average reaction time difference, and the average temperature difference are analyzed to see if they meet the preset conditions. If at least one average value meets the preset conditions N times in a row, it is determined that a fault may occur, and the staff is reminded to carry out maintenance.

[0101] By implementing the methods provided in the above embodiments, two major processes, fault cause analysis and fault prediction, are designed, providing users with solutions for fault location and status prediction.

[0102] Among them, the fault cause analysis is achieved by setting logical judgment rules for matching analysis, which enables the direct location of the cause of the fault and the solution when the partition fails.

[0103] Fault prediction is achieved by constructing trend curves of data for analysis. This enables the establishment of correlations between the data of the disconnectors when no faults occur, thereby providing feedback on the status trend of the disconnectors and predicting possible faults in advance. This allows for targeted and purposeful maintenance.

[0104] Referring to Example 10, corresponding to the above method embodiment, a fault analysis device for a rail transit overhead contact line is provided. The device includes: a data acquisition device 1010 and a controller 1020, wherein the data acquisition module 1010 is disposed on the isolating switch. The data acquisition module 1010 is used to acquire real-time action data of the isolating switch at the current moment. The real-time action data includes: isolating switch position status, circuit breaker status, opening angle, closing angle, motor current, opening time, closing time, and contact temperature during closing. The controller 1020 includes: The judgment module 1021 is used to determine whether the isolating switch has malfunctioned based on the real-time action data; The fault analysis module 1022 is used to determine the corresponding fault cause by performing logical judgments on the position status of the isolating switch, the status of the circuit breaker, the opening angle, the closing angle, the motor current, the opening time, the closing time, and the contact temperature during closing, respectively, based on the position status of the isolating switch, the state of the circuit breaker, the opening angle, the closing angle, the motor current, the opening time, the closing time, and the contact temperature during closing. The prediction module 1023 is used to collect historical action data of the isolating switch at multiple consecutive time points before the current time when it is determined that no fault will occur, and construct an action data curve of the isolating switch based on the historical action data and the real-time action data; analyze the changing trend of each action parameter in the action data curve set, and determine whether the isolating switch is inclined to cause a fault based on the changing trend.

[0105] In this embodiment, the data acquisition module includes a closed auxiliary switch, an open auxiliary switch, a circuit breaker auxiliary contact, a closed angle sensor, an open angle sensor, a current sensor, an open limit switch, a closed limit switch, a temperature and humidity sensor, and a temperature measuring camera. The data acquisition module 1010 is specifically used for: The position state of the isolating disconnector is determined based on the states of the closing auxiliary switch and the opening auxiliary switch located on the closing and opening contacts of the isolating disconnector. The position state of the isolating disconnector includes the closing state and the opening state. The circuit breaker status is determined based on the conduction status of the circuit breaker auxiliary contacts located on the drive circuit of the isolating switch; The closing angle sensor and the opening angle sensor are respectively collected by the closing and opening rotation angles of the disconnector. Real-time operating current is collected based on the current sensor of the motor coil located in the isolating switch; The opening and closing times are collected based on the open and close contacts of the isolating switch and the open and close limit switches on the drive circuit. The ambient humidity at the location of the isolating switch is collected based on temperature and humidity sensors; The temperature of the isolating switch contacts when they are in the closed position is determined by a temperature measuring camera.

[0106] In this embodiment, the fault analysis module 1022 is specifically used for: If the isolating switch is in the open position, based on the isolating switch position, the circuit breaker position, the closing angle, the motor current, the closing time, and the contact temperature during closing, logical judgments are made for over-closing, under-closing, and failure to close, respectively, to determine the corresponding cause of the closing fault. If the isolating switch is in the open position, based on the isolating switch position, the circuit breaker status, the opening angle, the motor current, and the opening time, logical judgments are made on the opening over-position, opening under-position, and opening failure to operate, respectively, to determine the corresponding opening fault cause.

[0107] In this embodiment, the fault analysis module 1022 is specifically used for: Determine whether the position status of the isolating switch, the status of the circuit breaker, the closing angle, the motor current, the closing time, and the contact temperature during closing all meet the first closing fault condition; if all conditions are met, then determine that the isolating switch has a position offset fault of the closed limit switch; the first closing fault condition is that the position status of the isolating switch and the status of the circuit breaker are at the first state value, the closing angle is greater than the first angle value, the motor current is within the first current range, the closing time is within the first time range, and the contact temperature during closing is greater than the first temperature value; Determine whether the position status of the isolating switch, the status of the circuit breaker, the closing angle, the motor current, the closing time, and the contact temperature during closing all meet the second closing fault conditions; if all conditions are met, then determine that the isolating switch is a failure of the closing limit switch itself; the second closing fault conditions are that the position status of the isolating switch and the status of the circuit breaker are at the first state value, the closing angle is greater than the first angle value, the motor current is within the second current range, the closing time is greater than the upper boundary value of the first time range, and the contact temperature during closing is greater than the first temperature value; Determine whether the position status of the isolating switch, the status of the circuit breaker, the closing angle, the motor current, the closing time, and the contact temperature during closing all meet the third closing fault condition; if all conditions are met, then determine that the isolating switch has a position offset fault of the closed limit switch; the third closing fault condition is that the position status of the isolating switch and the status of the circuit breaker are at the first state value, the closing angle is within the first angle range, the motor current is within the first current range, the closing time is within the second time range, and the contact temperature during closing is greater than the first temperature value; Determine whether the position status of the isolating switch, the status of the circuit breaker, the closing angle, the motor current, and the closing time all meet the fourth closing fault condition; if all are met, then determine that the isolating switch has an initial position abnormality fault; the fourth closing fault condition is that the position status of the isolating switch is the second state value, the status of the circuit breaker is the first state value, the closing angle is within the second angle range, and the motor current and the closing time are 0; Determine whether the position state of the isolating switch, the state of the circuit breaker, the closing angle, the motor current, and the closing time all meet the fifth closing fault condition; if all are met, then determine that the isolating switch has a fault of disengagement of the switch contact from the electric mechanism transmission; the fifth closing fault condition is that the position state of the isolating switch and the state of the circuit breaker are at the first state value, the closing angle is within the third angle range, the motor current is within the third current range, and the closing time is within the third time range; Determine whether the position status of the isolating switch, the status of the circuit breaker, the closing angle, the motor current, and the closing time all meet the sixth closing fault condition; if all are met, then determine that the isolating switch is a motor burnout fault; the sixth closing fault condition is that the position status of the isolating switch is the second state value, the status of the circuit breaker is the first state value, the closing angle is within the third angle range, the motor current is greater than the first current value, and the closing time is 0.

[0108] In this embodiment, the fault analysis module 1022 is specifically used for: Determine whether the position status of the isolating switch, the status of the circuit breaker, the opening angle, the motor current, and the opening time all meet the first opening fault condition; if all are met, then determine that the isolating switch is experiencing a position offset fault of the closed limit switch; the first opening fault condition is that the position status of the isolating switch and the status of the circuit breaker are at the first state value, the opening angle is not greater than the second angle value, the motor current is within the first current range, and the opening time is within the first time range; Determine whether the position state of the isolating switch, the state of the circuit breaker, the opening angle, the motor current, and the opening time all meet the second opening fault condition; if all are met, then determine that the isolating switch is a failure of the closed limit switch itself; the second opening fault condition is that the position state of the isolating switch and the state of the circuit breaker are at the first state value, the opening angle is not greater than the second angle value, the motor current is within the second current range, and the opening time is greater than the upper boundary value of the first time range; Determine whether the position status of the isolating switch, the status of the circuit breaker, the opening angle, the motor current, and the opening time all meet the third opening fault condition; if all are met, then determine that the isolating switch is experiencing a position offset fault of the closed limit switch; the third opening fault condition is that the position status of the isolating switch and the status of the circuit breaker are at the first state value, the opening angle is within the fourth angle range, the motor current is within the first current range, and the opening time is within the second time range; Determine whether the position status of the isolating switch, the status of the circuit breaker, the opening angle, the motor current, and the opening time all meet the fourth opening fault condition; if all are met, then determine that the isolating switch has an initial position abnormality fault; the fourth opening fault condition is that the position status of the isolating switch is the second state value, the status of the circuit breaker is the first state value, the opening angle is within the second angle range, and the motor current and the opening time are 0; Determine whether the position state of the isolating switch, the state of the circuit breaker, the opening angle, the motor current, and the opening time all meet the fifth opening fault condition; if all are met, then determine that the isolating switch has a fault of disengagement of the switch contact from the electric mechanism transmission; the fifth opening fault condition is that the position state of the isolating switch and the state of the circuit breaker are at the first state value, the opening angle is within the fifth angle range, the motor current is within the third current range, and the opening time is within the third time range; Determine whether the position status of the isolating switch, the status of the circuit breaker, the opening angle, the motor current, and the opening time all meet the sixth opening fault condition; if all are met, then determine that the isolating switch has a motor burnout fault; the sixth opening fault condition is that the position status of the isolating switch is the second state value, the status of the circuit breaker is the first state value, the opening angle is within the fifth angle range, the motor current is greater than the first current value, and the opening time is 0.

[0109] In this embodiment, the prediction module 1023 is specifically used for: Calculate the slope of each curve at multiple adjacent time points in the action data curve set; Determine whether the slopes of the multiple curves meet preset conditions; Based on the judgment result, it is determined whether the isolating switch is trending towards failure.

[0110] In this embodiment, the prediction module 1023 is specifically used for: Calculate the average angle difference between two consecutive adjacent time points in the action data curve set of the opening and closing rotation angle and the opening and closing number curve, and obtain the slope of the curve corresponding to the two consecutive adjacent time points. Calculate the average current difference between two consecutive adjacent time points in the motor current and opening / closing number curves of the action data curve set, and obtain the slope of the curves corresponding to two consecutive adjacent time points. Calculate the average difference in reaction time between multiple consecutive adjacent time points in the action data curve set of opening and closing response time and opening and closing number curves to obtain the slope of the curves corresponding to multiple adjacent time points. Calculate the average temperature difference between two consecutive adjacent time points in the contact temperature and day count curve of the action data curve set, and obtain the slope of the curve corresponding to the two consecutive adjacent time points.

[0111] In this embodiment, the prediction module 1023 is specifically used for: If the judgment result is that N consecutive curve slopes satisfy the preset conditions, then it is determined that the isolating switch is trending towards a fault.

[0112] In the technical solution provided in this embodiment, a data acquisition module installed on the isolating switch collects the isolating switch position status, circuit breaker status, opening and closing angles, motor current, opening and closing times, and contact temperature during closing in real time. Then, based on the real-time action data of the isolating switch, fault cause analysis or fault prediction is performed. During fault cause analysis, the collected action data is compared with logical judgment rules for different fault causes to determine the fault cause. During fault prediction, prediction is achieved by analyzing the changing trends of the collected action data. This application achieves fault analysis and fault prediction by setting logical judgment rules for different fault causes and analyzing data changing trends. Compared with existing solutions, this method has higher fault analysis efficiency, and the prediction accuracy is improved by predicting changing trends, thus enabling early intervention before a fault occurs by understanding the development of the isolating switch status.

[0113] See Figure 11 As shown, the electronic device includes a processor 1100 and a memory 1101. The memory 1101 stores machine-executable instructions that can be executed by the processor 1100. The processor 1100 executes the machine-executable instructions to implement the above-mentioned fault analysis method for the contact wire isolating switch of rail transit.

[0114] Furthermore, Figure 11 The electronic device shown also includes a bus 1102 and a communication interface 1103. The processor 1100, the communication interface 1103 and the memory 1101 are connected via the bus 1102.

[0115] The memory 1101 may include high-speed random access memory (RAM) and may also include non-volatile memory, such as at least one disk storage device. Communication between this system network element and at least one other network element is achieved through at least one communication interface 1103 (which can be wired or wireless), such as the Internet, wide area network, local area network, metropolitan area network, etc. The bus 1102 may be an ISA bus, PCI bus, or EISA bus, etc. The bus can be divided into address bus, data bus, control bus, etc. For ease of representation, Figure 11 The symbol is represented by a single double-headed arrow, but this does not mean that there is only one bus or one type of bus.

[0116] The processor 1100 may be an integrated circuit chip with signal processing capabilities. In implementation, each step of the above method can be completed by the integrated logic circuitry in the hardware of the processor 1100 or by instructions in software form. The processor 1100 may be a general-purpose processor, including a central processing unit (CPU), a network processor (NP), etc.; it may also be a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, or discrete hardware components. It can implement or execute the methods, steps, and logic block diagrams disclosed in the embodiments of this disclosure. The general-purpose processor may be a microprocessor or any conventional processor. The steps of the methods disclosed in the embodiments of this disclosure can be directly manifested as execution by a hardware decoding processor, or execution by a combination of hardware and software modules in the decoding processor. The software module can reside in a mature storage medium in the art, such as random access memory, flash memory, read-only memory, programmable read-only memory, electrically erasable programmable memory, or registers. This storage medium is located in memory 1101. Processor 1100 reads information from memory 1101 and, in conjunction with its hardware, completes the method steps of the aforementioned embodiments.

[0117] This application also provides a computer-readable storage medium, which can be a non-volatile computer-readable storage medium or a volatile computer-readable storage medium. The computer-readable storage medium stores instructions that, when executed on a computer, cause the computer to perform the steps of a fault analysis method for a rail transit overhead contact line isolating switch.

[0118] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working processes of the systems, devices, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here.

[0119] If the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods of the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0120] The above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit it. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.

Claims

1. A fault analysis method for a contact wire isolating switch in rail transit, applied to a rail transit intelligent operation and maintenance system, wherein the rail transit intelligent operation and maintenance system includes at least a data acquisition module installed on the isolating switch, characterized in that, The method includes: The system receives real-time action data of the isolating switch collected by the data acquisition module at the current moment. The real-time action data includes: isolating switch position status, circuit breaker status, opening angle, closing angle, motor current, opening time, closing time, and contact temperature during closing. Based on the real-time action data, determine whether the isolating switch has malfunctioned; If a fault occurs, logical judgments are made on the position status of the isolating switch, the status of the circuit breaker, the opening angle, the closing angle, the motor current, the opening time, the closing time, and the contact temperature during closing, respectively, to determine the corresponding fault cause by identifying over-operation, under-operation, and refusal to operate. If no fault occurs, historical action data of the isolating switch at multiple consecutive time points before the current moment are collected, and a set of action data curves of the isolating switch is constructed based on the historical action data and the real-time action data. Analyze the changing trends of each action parameter in the action data curve set, and determine whether the isolating switch is trending towards failure based on the changing trends.

2. The fault analysis method for the contact wire isolating switch of rail transit according to claim 1, characterized in that, The data acquisition module includes a closed auxiliary switch, an open auxiliary switch, a circuit breaker auxiliary contact, a closed angle sensor, an open angle sensor, a current sensor, an open limit switch, a closed limit switch, a temperature and humidity sensor, and a temperature measuring camera. The receiving of real-time action data of the isolating switch collected by the data acquisition module at the current moment includes: The position state of the isolating disconnector is determined based on the states of the closing auxiliary switch and the opening auxiliary switch located on the closing and opening contacts of the isolating disconnector. The position state of the isolating disconnector includes the closing state and the opening state. The circuit breaker status is determined based on the conduction status of the circuit breaker auxiliary contacts located on the drive circuit of the isolating switch; The closing angle sensor and the opening angle sensor are respectively collected by the closing and opening rotation angles of the disconnector. Real-time operating current is collected based on the current sensor of the motor coil located in the isolating switch; The opening and closing times are collected based on the open and close contacts of the isolating switch and the open and close limit switches on the drive circuit. The ambient humidity at the location of the isolating switch is collected based on temperature and humidity sensors; The temperature of the isolating switch contacts when they are in the closed position is determined by a temperature measuring camera.

3. The fault analysis method for the contact wire isolating switch of rail transit according to claim 1, characterized in that, The system performs logical judgments based on the position status of the isolating switch, the status of the circuit breaker, the opening angle, the closing angle, the motor current, the opening time, the closing time, and the contact temperature during closing, respectively, to determine the corresponding fault causes, including: If the isolating switch is in the closed position, based on the isolating switch position, the circuit breaker position, the closing angle, the motor current, the closing time, and the contact temperature during closing, logical judgments are made for over-closing, under-closing, and failure to close, respectively, to determine the corresponding cause of the closing fault. If the isolating switch is in the open position, based on the isolating switch position, the circuit breaker status, the opening angle, the motor current, and the opening time, logical judgments are made on the opening over-position, opening under-position, and opening failure to operate, respectively, to determine the corresponding opening fault cause.

4. The fault analysis method for the contact wire isolating switch of rail transit according to claim 3, characterized in that, The system performs logical judgments based on the position status of the isolating switch, the status of the circuit breaker, the closing angle, the motor current, the closing time, and the contact temperature during closing, respectively, to determine the corresponding closing fault causes, including: Determine whether the position status of the isolating switch, the status of the circuit breaker, the closing angle, the motor current, the closing time, and the contact temperature during closing all meet the first closing fault condition; if all conditions are met, then determine that the isolating switch is experiencing a position offset fault of the closed limit switch. Determine whether the position status of the isolating switch, the status of the circuit breaker, the closing angle, the motor current, the closing time, and the contact temperature during closing all meet the second closing fault conditions; if all conditions are met, then determine that the isolating switch is a failure of the closing limit switch itself. Determine whether the position status of the isolating switch, the status of the circuit breaker, the closing angle, the motor current, the closing time, and the contact temperature during closing all meet the third closing fault condition; if all conditions are met, then determine that the isolating switch is experiencing a position offset fault of the closed limit switch. Determine whether the position status of the isolating switch, the status of the circuit breaker, the closing angle, the motor current, and the closing time all meet the fourth closing fault condition; if all conditions are met, then determine that the isolating switch has an initial position abnormality fault. Determine whether the position status of the isolating switch, the status of the circuit breaker, the closing angle, the motor current, and the closing time all meet the fifth closing fault condition; if all conditions are met, then determine that the isolating switch has a fault of disengagement of the switch contact from the electric mechanism transmission. Determine whether the position status of the isolating switch, the status of the circuit breaker, the closing angle, the motor current, and the closing time all meet the sixth closing fault condition; if all conditions are met, then determine that the isolating switch is a motor burnout fault.

5. The fault analysis method for the contact wire isolating switch of rail transit according to claim 3, characterized in that, The logical judgments based on the isolating switch position status, the circuit breaker status, the opening angle, the motor current, and the opening time are used to determine the corresponding opening fault causes, including: Determine whether the position status of the isolating switch, the status of the circuit breaker, the opening angle, the motor current, and the opening time all meet the first opening fault conditions; if all conditions are met, then determine that the isolating switch is experiencing a position offset fault of the closed limit switch. Determine whether the position status of the isolating switch, the status of the circuit breaker, the opening angle, the motor current, and the opening time all meet the second opening fault conditions; if all conditions are met, then determine that the isolating switch is a failure of the closing limit switch itself. Determine whether the position status of the isolating switch, the status of the circuit breaker, the opening angle, the motor current, and the opening time all meet the third opening fault condition; if all conditions are met, then determine that the isolating switch is experiencing a position offset fault of the closed limit switch. Determine whether the position status of the isolating switch, the status of the circuit breaker, the opening angle, the motor current, and the opening time all meet the fourth opening fault condition; if all conditions are met, then determine that the isolating switch has an initial position abnormality fault. Determine whether the position status of the isolating switch, the status of the circuit breaker, the opening angle, the motor current, and the opening time all meet the fifth opening fault condition; if all conditions are met, then determine that the isolating switch has a fault of disengagement of the switch contact from the electric mechanism transmission. Determine whether the position status of the isolating switch, the status of the circuit breaker, the opening angle, the motor current, and the opening time all meet the sixth opening fault condition; if all conditions are met, then determine that the isolating switch is a motor burnout fault.

6. The fault analysis method for the contact wire isolating switch of rail transit according to claim 1, characterized in that, The analysis of the changing trends of each action parameter in the action data curve set, and the determination of whether the isolating switch is trending towards failure based on each of the changing trends, includes: Calculate the slope of each curve at multiple adjacent time points in the action data curve set; Determine whether the slopes of the multiple curves meet preset conditions; Based on the judgment result, it is determined whether the isolating switch is trending towards failure.

7. The fault analysis method for the contact wire isolating switch of rail transit according to claim 6, characterized in that, The calculation of the slope of each curve at multiple adjacent time points in the action data curve set includes: Calculate the average angle difference between two consecutive adjacent time points in the action data curve set of the opening and closing rotation angle and the opening and closing number curve, and obtain the slope of the curve corresponding to the two consecutive adjacent time points. Calculate the average current difference between two consecutive adjacent time points in the motor current and opening / closing number curves of the action data curve set, and obtain the slope of the curves corresponding to two consecutive adjacent time points. Calculate the average difference in reaction time between multiple consecutive adjacent time points in the action data curve set of opening and closing response time and opening and closing number curves to obtain the slope of the curves corresponding to multiple adjacent time points. Calculate the average temperature difference between two consecutive adjacent time points in the contact temperature and day count curve of the action data curve set, and obtain the slope of the curve corresponding to the two consecutive adjacent time points.

8. The fault analysis method for the contact wire isolating switch of rail transit according to claim 6, characterized in that, The step of determining whether the isolating switch is trending towards a fault based on the judgment result includes: If the judgment result is that N consecutive curve slopes satisfy the preset conditions, then it is determined that the isolating switch is trending towards a fault.

9. A fault analysis device for a contact wire isolating switch in rail transit, characterized in that, The device includes: a data acquisition device and a controller, wherein the data acquisition module is mounted on the isolating switch; The data acquisition module is used to collect real-time action data of the isolating switch at the current moment. The real-time action data includes: isolating switch position status, circuit breaker status, opening angle, closing angle, motor current, opening time, closing time, and contact temperature during closing. The controller includes: The judgment module is used to determine whether the isolating switch has malfunctioned based on the real-time action data; The fault analysis module is used to determine the corresponding fault cause by performing logical judgments on the position status of the isolating switch, the status of the circuit breaker, the opening angle, the closing angle, the motor current, the opening time, the closing time, and the contact temperature during closing, based on the position status of the isolating switch, the opening status, the closing angle, the closing angle, the motor current, the opening time, the closing time, and the contact temperature during closing, respectively. The prediction module is used to collect historical action data of the isolating switch at multiple consecutive time points before the current time when it is determined that no fault will occur, and construct an action data curve of the isolating switch based on the historical action data and the real-time action data; analyze the changing trend of each action parameter in the action data curve set, and determine whether the isolating switch is inclined to cause a fault based on the changing trend.

10. An electronic device, characterized in that, The electronic device includes: a memory and at least one processor, wherein the memory stores instructions; The at least one processor invokes the instructions in the memory to cause the electronic device to execute the fault analysis method for the rail transit overhead contact line isolating switch as described in any one of claims 1-8.

11. A computer-readable storage medium storing instructions thereon, characterized in that, When the instruction is read and executed, it performs the fault analysis method for the rail transit overhead contact line isolating switch as described in any one of claims 1-8.

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