A fault judgment method and device based on relay protection transmitter with time-stamp telemetry

Abstract

The present application provides a fault judgment method and device based on a relay protection transmitter with time-stamp telemetry, and the fault judgment method of the relay protection transmitter includes: obtaining the current value of the first feeder, obtaining the current value of the second feeder, obtaining the current value of the incoming line, calculating the current deviation according to the current value of the first feeder, the current value of the second feeder and the current value of the incoming line, and determining whether to start the fault diagnosis operation according to the current deviation and the fault start condition. By comparing whether the current deviations of the current value of the first feeder, the current value of the second feeder and the incoming line current value at the same time point are consistent, it is possible to quickly and accurately judge whether the transmitter has a fault, with a high fault identification accuracy, greatly reducing the risk caused by fault delays, and significantly improving the safety and reliability of the subway power system.

Description

Technical Field

[0001] The present application relates to the technical field of relay protection for distribution networks, and in particular to a fault judgment method and device based on a relay protection transmitter with time-stamp telemetry. Background Art

[0002] In modern urban transportation systems, subways, as an efficient and fast public transportation mode, play an increasingly important role in urban public transportation systems. In subway power systems, relay protection transmitters are one of the key devices. They are responsible for the measurement of electrical quantities such as voltage and current in substations and the conversion and transmission of signals, providing a guarantee for the stable operation of the system. The traditional fault monitoring method of subway relay protection transmitters mainly relies on regular manual inspections and simple electrical parameter monitoring. This method is not only time-consuming and labor-intensive, but also difficult to accurately detect faults in real time, which has certain limitations in improving the safety and efficiency of subway operations. With the development of technologies such as intelligent sensing technology, big data and cloud computing, fault monitoring methods based on data analysis have begun to be applied to subway power systems. These methods predict and identify possible faults in the system by analyzing a large amount of collected data. However, these methods often need to process a large amount of data, and have high requirements for data processing and analysis, which increases the complexity and cost of the system. Summary of the invention

[0003] In order to solve the above technical problems, this application is proposed. The embodiment of this application provides a fault judgment method and device based on a relay protection transmitter with time-stamp telemetry, which solves the problem that the traditional fault detection method of subway relay protection transmitter in the prior art mainly relies on regular manual inspection and simple electrical parameter monitoring, which is not only time-consuming and labor-intensive, but also difficult to accurately detect faults in real time; the fault detection method based on data analysis often needs to collect and process a large amount of data, which increases the complexity and cost of the system.

[0004] According to one aspect of the present application, the present application provides a fault judgment method based on a relay protection transmitter with time-stamped telemetry, including: obtaining the current value of the first feeder sent by the relay protection transmitter; wherein the relay protection transmitter is electrically connected to the first feeder; obtaining the current value of the second feeder sent by the relay protection transmitter; wherein the relay protection transmitter is electrically connected to the second feeder; obtaining the current value of the incoming line sent by the relay protection transmitter; wherein the relay protection transmitter is electrically connected to the incoming line; calculating the current deviation based on the current value of the first feeder, the current value of the second feeder and the current value of the incoming line; determining whether to start a fault diagnosis operation based on the current deviation and the fault start condition; if the fault diagnosis operation is started, determining whether the relay protection transmitter is faulty based on the fault diagnosis condition.

[0005] In a possible implementation, calculating the current deviation based on the current value of the first feeder, the current value of the second feeder, and the current value of the incoming line includes: calculating the sum of the current value of the first feeder and the current value of the second feeder; wherein the time points of the current value of the first feeder, the current value of the second feeder, and the current value of the incoming line are the same; and calculating the current deviation between the sum and the current value of the incoming line.

[0006] In a possible implementation, determining whether to start a fault diagnosis operation according to the current deviation and the fault initiation condition includes: if the current deviation is greater than the current value of the incoming line, starting the fault diagnosis operation.

[0007] In a possible implementation, if the fault diagnosis operation is started, determining whether the relay protection transmitter is faulty based on the fault diagnosis condition includes: if the fault diagnosis operation is started, determining whether the incoming line circuit breaker, the first feeder circuit breaker, and the second feeder circuit breaker are disconnected; wherein the incoming line circuit breaker is electrically connected to the incoming line, the first feeder circuit breaker is electrically connected to the first feeder, and the second feeder circuit breaker is electrically connected to the second feeder; if the incoming line circuit breaker, the first feeder circuit breaker, and the second feeder circuit breaker are not disconnected, determining whether the relay protection transmitter is faulty based on the fault diagnosis condition.

[0008] In a possible implementation, the determination of whether the relay protection transmitter is faulty based on the fault diagnosis condition includes: determining whether the current value of the first feeder, the current value of the second feeder, or the current value of the incoming line collected by the relay protection transmitter are equal in value within a preset time period; if it is determined that the current value of the first feeder, the current value of the second feeder, or the current value of the incoming line collected by the relay protection transmitter are equal in value within a preset time period, it is determined that the relay protection transmitter has a circuit breaker fault.

[0009] In a possible implementation, determining whether the relay protection transmitter is faulty based on fault diagnosis conditions includes: obtaining an error value curve; wherein the error value curve includes a current deviation of a first preset time period and a current deviation of a second preset time period, and the first preset time period is earlier than the second preset time period; determining whether the current deviation of the first preset time period and the current deviation of the second preset time period are numerically equal; if the current deviation of the first preset time period and the current deviation of the second preset time period are numerically equal, determining that a drift error occurs in the relay protection transmitter; wherein the drift error indicates that the difference between the current value of the first feeder whose data is collected by the relay protection transmitter and the actual current value of the first feeder is greater than a first preset difference threshold, or the difference between the current value of the second feeder collected by the relay protection transmitter and the actual current value of the second feeder is greater than a second preset difference threshold, or the difference between the current value of the incoming line collected by the relay protection transmitter and the actual current value of the incoming line is greater than a third difference threshold.

[0010] In a possible implementation, the method of determining whether the relay protection transmitter is faulty based on fault diagnosis conditions includes: obtaining current deviations within multiple continuous time periods; determining the change state of the current deviation within each continuous time period; if there are a preset number of identical change states, determining that a multiplier error occurs in the relay protection transmitter; wherein the multiplier error indicates that the ratio between the current value of the first feeder collected by the relay protection transmitter and the actual current value of the first feeder is greater than a first preset ratio threshold, or the ratio between the current value of the second feeder collected by the relay protection transmitter and the actual current value of the second feeder is greater than a second preset ratio threshold, or the ratio between the current value of the incoming line collected by the relay protection transmitter and the actual current value of the incoming line is greater than a third preset ratio threshold.

[0011] In a possible implementation, the determination of whether the relay protection transmitter is faulty based on the fault diagnosis condition includes: calculating the average current value of the first feeder within a third preset time period; calculating the average current value of the first feeder within a fourth preset time period; wherein the third preset time period is earlier than the fourth preset time period; calculating the difference between the average current value of the first feeder within the third preset time period and the average current value of the first feeder within the fourth preset time period; if the difference is greater than a preset difference threshold, determining that the relay protection transmitter is faulty.

[0012] According to the second aspect of the present application, the present application provides a fault judgment device based on a relay protection transmitter with time-stamped telemetry, including: a first current acquisition module, used to acquire the current value of the first feeder sent by the relay protection transmitter; a second current acquisition module, used to acquire the current value of the second feeder sent by the relay protection transmitter; a third current acquisition module, used to acquire the incoming line current value sent by the relay protection transmitter; wherein the first feeder, the second feeder, and the incoming line are all electrically connected to the relay protection transmitter; a calculation module, used to calculate the current deviation according to the current value of the first feeder, the current value of the second feeder, and the incoming line current value; a first determination module, used to determine whether to start a fault diagnosis operation according to the current deviation and a fault start condition; a second determination module, used to determine whether the relay protection transmitter is faulty based on the fault diagnosis condition if the fault diagnosis operation is started.

[0013] According to the third aspect of the present application, the present application provides a relay protection device, including: a DC bus; a first feeder circuit breaker, the output end of the first feeder circuit breaker is electrically connected to the input end of the locomotive through the first feeder, and the input end of the first feeder circuit breaker is electrically connected to the DC bus; a second feeder circuit breaker, the output end of the second feeder circuit breaker is electrically connected to the input end of the locomotive through the second feeder, the input end of the second feeder circuit breaker is electrically connected to the DC bus, and the first feeder is electrically connected to the second feeder; an incoming line circuit breaker, the input end of the incoming line circuit breaker is electrically connected to the output end of the rail through the incoming line, and the output end of the incoming line circuit breaker is electrically connected to the DC bus; a relay protection transmitter, the relay protection transmitter is electrically connected to the first feeder, the second feeder and the incoming line respectively, and the relay protection transmitter is used to collect the current value of the first feeder, the current value of the second feeder and the current value of the incoming line.

[0014] The present application provides a fault judgment method and device based on a relay protection transmitter with time-stamp telemetry, and the fault judgment method of the relay protection transmitter includes: obtaining the current value of a first feeder sent by the relay protection transmitter, wherein the relay protection transmitter is electrically connected to the first feeder; obtaining the current value of a second feeder sent by the relay protection transmitter, wherein the relay protection transmitter is electrically connected to the second feeder, obtaining the current value of an incoming line sent by the relay protection transmitter, wherein the relay protection transmitter is electrically connected to the incoming line, calculating a current deviation based on the current value of the first feeder, the current value of the second feeder, and the current value of the incoming line, determining whether to start a fault diagnosis operation based on the current deviation and a fault start condition, and if the fault diagnosis operation is started, determining whether the relay protection transmitter is faulty based on the fault diagnosis condition. By comparing the current deviations of the first feeder, the second feeder and the incoming line at the same time point, it is possible to quickly and accurately determine whether the transmitter has failed. This not only monitors the status of the relay protection transmitter in real time, but also has a high fault identification accuracy rate, which can significantly improve the safety and reliability of the subway power system and greatly reduce the risks caused by fault delays. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] By describing the embodiments of the present application in more detail in conjunction with the accompanying drawings, the above and other purposes, features and advantages of the present application will become more apparent. The accompanying drawings are used to provide a further understanding of the embodiments of the present application and constitute a part of the specification. Together with the embodiments of the present application, they are used to explain the present application and do not constitute a limitation of the present application. In the accompanying drawings, the same reference numerals generally represent the same components or steps.

[0016] Figure 1 It is a flowchart of a fault judgment method for a relay protection transmitter provided by an exemplary embodiment of the present application.

[0017] Figure 2 It is a flowchart of a fault judgment method for a relay protection transmitter provided by another exemplary embodiment of the present application.

[0018] Figure 3 It is a flowchart of a fault judgment method for a relay protection transmitter provided by another exemplary embodiment of the present application.

[0019] Figure 4 It is a flowchart of a fault judgment method for a relay protection transmitter provided by another exemplary embodiment of the present application.

[0020] Figure 5 It is a flowchart of a fault judgment method for a relay protection transmitter provided by another exemplary embodiment of the present application.

[0021] Figure 6It is a flowchart of a fault judgment method for a relay protection transmitter provided by another exemplary embodiment of the present application.

[0022] Figure 7 It is a flowchart of a fault judgment method for a relay protection transmitter provided by another exemplary embodiment of the present application.

[0023] Figure 8 It is a flowchart of a fault judgment method for a relay protection transmitter provided by another exemplary embodiment of the present application.

[0024] Fig. 9 It is a structural schematic diagram of a fault judgment device for a relay protection transmitter provided by another exemplary embodiment of the present application.

[0025] Fig.10 It is a structural schematic diagram of a relay protection transmitter provided by another exemplary embodiment of the present application.

[0026] Fig.11 It is a structural diagram of an electronic device provided by an exemplary embodiment of the present application.

[0027] Description of reference numerals:

[0028] 1. DC bus; 2. first feeder; 21. first feeder circuit breaker; 3. second feeder; 31. second feeder circuit breaker; 4. incoming line; 41. incoming line circuit breaker; 5. locomotive; 6. rail; 7. relay protection transmitter; 20. fault judgment device; 201. first current acquisition module; 202. second current acquisition module; 203. third current acquisition module; 204. calculation module; 205. first determination module; 206. second determination module; 10. electronic device; 11. processor; 12. memory; 13. input device; 14. output device. DETAILED DESCRIPTION

[0029] Below, the exemplary embodiments according to the present application will be described in detail with reference to the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application, and it should be understood that the present application is not limited to the exemplary embodiments described here.

[0030] Figure 1 FIG. 1 is a flow chart of a fault judgment method for a relay protection transmitter provided by an exemplary embodiment of the present application. Figure 1 As shown, the fault judgment method of the relay protection transmitter includes:

[0031] Step 100: obtaining a current value of a first feeder sent by a relay protection transmitter, wherein the relay protection transmitter is electrically connected to the first feeder;

[0032] In an embodiment of the present application, in order to ensure the reliability and safety of the subway power supply system, the relay protection transmitter is electrically connected to the first feeder, and telemetry information of the first feeder sent by the relay protection transmitter is collected, and the telemetry information includes but is not limited to the current value of the first feeder.

[0033] Step 200: obtaining a current value of a second feeder sent by a relay protection transmitter, wherein the relay protection transmitter is electrically connected to the second feeder;

[0034] In an embodiment of the present application, the relay protection transmitter is electrically connected to the second feeder, and telemetry information of the second feeder sent by the relay protection transmitter is collected, where the telemetry information includes but is not limited to the current value of the second feeder.

[0035] Step 300: obtaining the current value of the incoming line sent by the relay protection transmitter; wherein the relay protection transmitter is electrically connected to the incoming line;

[0036] In an embodiment of the present application, the relay protection transmitter is electrically connected to the incoming line, and the telemetry information sent by the relay protection transmitter is collected, and the telemetry information includes but is not limited to the current value.

[0037] It should be understood that there can be multiple relay protection transmitters. For example, the current value of the first feeder can be sent by the first relay protection transmitter, the current value of the second feeder can be sent by the second relay protection transmitter, and the current value of the incoming line can be sent by the third relay protection transmitter. The first relay protection transmitter, the second relay protection transmitter and the third relay protection transmitter are different transmitters.

[0038] Step 400: Calculate the current deviation according to the current value of the first feeder, the current value of the second feeder, and the current value of the incoming line;

[0039] Step 500: Determine whether to start a fault diagnosis operation according to the current deviation and the fault start condition;

[0040] In an embodiment of the present application, if the current deviation value of step 500 is greater than the current value of the incoming line, the fault diagnosis operation is started; if the current deviation value of step 500 is equal to or less than the incoming current value, the relay protection transmitter is in a normal state, and the average current value of the relay protection transmitter within one hour is recorded, and based on the average current value within one hour and the current average value of the historical period, the current average value of the relay protection transmitter from the historical period to the current period is updated.

[0041] Step 600: If the fault diagnosis operation is started, determine whether the relay protection transmitter is faulty based on the fault diagnosis condition.

[0042] The present application provides a fault judgment method based on a relay protection transmitter with time-stamped telemetry, and the fault judgment method of the relay protection transmitter includes: obtaining the current value of the first feeder sent by the relay protection transmitter; wherein the relay protection transmitter is electrically connected to the first feeder; obtaining the current value of the second feeder sent by the relay protection transmitter; wherein the relay protection transmitter is electrically connected to the second feeder; obtaining the current value of the incoming line sent by the relay protection transmitter; wherein the relay protection transmitter is electrically connected to the incoming line; calculating the current deviation according to the current value of the first feeder, the current value of the second feeder and the current value of the incoming line; determining whether to start a fault diagnosis operation according to the current deviation and the fault starting condition; if the fault diagnosis operation is started, determining whether the relay protection transmitter is faulty based on the fault diagnosis condition. By comparing the current deviations of the first feeder, the second feeder and the incoming line at the same time point, it is possible to quickly and accurately determine whether the transmitter has failed. This not only monitors the status of the relay protection transmitter in real time, but also has a high fault identification accuracy rate, which can significantly improve the safety and reliability of the subway power system and greatly reduce the risks caused by fault delays.

[0043] Figure 2 FIG. 1 is a flow chart of a fault judgment method for a relay protection transmitter provided by another exemplary embodiment of the present application. Figure 2 As shown, step 400 includes:

[0044] Step 401: Calculate the sum of the current value of the first feeder and the current value of the second feeder; wherein the current value of the first feeder, the current value of the second feeder, and the current value of the incoming line are at the same time point;

[0045] In an embodiment of the present application, the relay protection device sends the current value of the first feeder with a timestamp, the current value of the second feeder with a timestamp, and the current value of the incoming line with a timestamp to the controller through the 104 protocol every 2 seconds, and aligns the obtained current value of the first feeder with a timestamp, the current value of the second feeder with a timestamp, and the current value of the incoming line with a timestamp, so that the time points of the current value of the first feeder, the current value of the second feeder, and the current value of the incoming line are the same, ensuring that the current value of the first feeder, the current value of the second feeder, and the current value of the incoming line are the current values ​​at the same time point.

[0046] Step 402: Calculate the current deviation between the sum value and the current value of the incoming line.

[0047] In an embodiment of the present application, by calculating the sum of the current value of the first feeder and the current value of the second feeder at the same time point, and then calculating the current deviation between the sum of the current value of the first feeder and the current value of the second feeder and the incoming line current value at the same time point, determine whether to perform a fault diagnosis operation by calculating the current deviation at the same time point. If a current deviation occurs between the sum and the current value of the incoming line, the fault diagnosis operation is entered, and by comparing the current value of the first feeder and the current value of the second feeder at the same time point, and whether there is a current deviation between the current value of the incoming line, it is possible to quickly and accurately determine whether a relay protection transmitter has failed. Therefore, the above method can not only monitor the status of the relay protection transmitter in real time, but also has a high fault identification accuracy rate.

[0048] If there is no current deviation between the sum in step 402 and the current value of the incoming line, no fault diagnosis operation is performed. At this time, the relay protection device records the average current value within one hour of the current time period, and updates the average of the average current value and the average current value of the historical time period to the relay protection transmitter.

[0049] Specifically, since the departure times of the seven days of the week are different, the data are different, and the relay protection transmitters need to be counted separately. By recording the average current value of each relay protection transmitter in the current time period, for example, recording the average current value from 9:00 to 10:00 a.m. on Tuesday of the current week, and then based on the calculation formula, according to the average current value of the current time period and the average current value of the historical time period, calculate the current average value from the historical time period to the current time period. For example, with a monthly cycle (current week + the first 4 weeks of the current week), obtain the current average value from 9:00 to 10:00 a.m. on Tuesday of the current week, and obtain the current average value from 9:00 to 10:00 a.m. on each Tuesday in the first 4 weeks. According to the current average value of the current week and the current average value of the first 4 weeks, calculate the current average value from the first 4 weeks to the current week, that is, the current average value of 5 weeks, wherein the calculation formula includes: the current average value from the historical time period to the current time period = (the current average value of the historical time period * 4 + the average current value of the current time period) / 5, the average current value of the current time period is the current average value of 5 weeks, that is, the system only stores one average value, and considers that the average current value of the current time period is the current average value of the current week and the first four weeks of the current week.

[0050] Figure 3 FIG. 1 is a flow chart of a fault judgment method for a relay protection transmitter provided by another exemplary embodiment of the present application. Figure 3 As shown, step 500 includes:

[0051] Step 501: Determine whether to start a fault diagnosis operation according to the current deviation and the fault starting condition, including: if the current deviation is greater than the current value of the incoming line, start the fault diagnosis operation.

[0052] In an embodiment of the present application, if the current deviation between the sum of the first feeder current value and the second feeder current value and the incoming line current value is greater than the incoming line current value, and the current deviation exceeds 10% of the incoming line current value, the system will identify this difference as a possible fault signal of the relay protection transmitter. Subsequently, the system will issue a fault prompt to the operation and maintenance personnel so that they can take corresponding maintenance or adjustment measures in time. By setting a 10% difference threshold, while ensuring the monitoring sensitivity, false alarms caused by small-range fluctuations are avoided, further improving the practicality and reliability of the system.

[0053] Figure 4 FIG. 1 is a flow chart of a fault judgment method for a relay protection transmitter provided by another exemplary embodiment of the present application. Figure 4 As shown, step 502: if the fault diagnosis operation is started, then based on the fault diagnosis condition, determining whether the relay protection transmitter is faulty includes: if the fault diagnosis operation is started, determining whether the incoming line circuit breaker, the first feeder circuit breaker, and the second feeder circuit breaker are disconnected; wherein the incoming line circuit breaker is electrically connected to the incoming line, the first feeder circuit breaker is electrically connected to the first feeder, and the second feeder circuit breaker is electrically connected to the second feeder; if the incoming line circuit breaker, the first feeder circuit breaker, and the second feeder circuit breaker are not disconnected, then based on the fault diagnosis condition, determining whether the relay protection transmitter is faulty.

[0054] In an embodiment of the present application, if the incoming circuit breaker, the first feeder circuit breaker and the second feeder circuit breaker are not disconnected, that is, there is no protection action on the incoming circuit breaker, the first feeder circuit breaker and the second feeder circuit breaker, then based on the fault diagnosis condition, it is determined whether the relay protection transmitter is faulty. If the incoming circuit breaker, the first feeder circuit breaker and the second feeder circuit breaker are all disconnected, that is, the protection action trips and the current does not flow, then the fault judgment program is exited and manual judgment is performed.

[0055] Figure 5 FIG. 1 is a flow chart of a fault judgment method for a relay protection transmitter provided by another exemplary embodiment of the present application. Figure 5 As shown, step 503 can be specifically implemented as follows: based on the fault diagnosis conditions, determining whether the relay protection transmitter is faulty includes: determining whether the current value of the first feeder or the current value of the second feeder or the current value of the incoming line collected by the relay protection transmitter are equal in value within a preset time period; if it is determined that the current value of the first feeder or the current value of the second feeder or the current value of the incoming line collected by the relay protection transmitter are equal in value within a preset time period, it is determined that the relay protection transmitter has a circuit breaker fault.

[0056] In this embodiment, if the value of the current value of the first feeder collected by the relay protection transmitter does not change within the preset time period, which can be 10 seconds, it means that the relay protection transmitter has a circuit breaker fault. If the value of the current value of the second feeder collected by the relay protection transmitter does not change within the preset time period, it means that the relay protection transmitter has a circuit breaker fault. If the value of the incoming line current value collected by the relay protection transmitter does not change within the preset time period, it means that the relay protection transmitter has a circuit breaker fault. By monitoring whether the value of the current value of the first feeder or the current value of the second feeder or the current value of the incoming line collected by the relay protection transmitter changes within a certain period of time, it is determined whether the relay protection transmitter has a circuit breaker fault. It can quickly identify whether the relay protection transmitter has a circuit breaker fault, greatly reduce the risk caused by fault delays, and provide a strong guarantee for the stable operation of the subway power supply system.

[0057] Figure 6 FIG. 1 is a flow chart of a fault judgment method for a relay protection transmitter provided by another exemplary embodiment of the present application. Figure 6 As shown, step 504 can be specifically implemented as follows: based on the fault diagnosis conditions, determining whether the relay protection transmitter is faulty includes: obtaining an error value curve; wherein the error value curve includes a current deviation of a first preset time period and a current deviation of a second preset time period, and the first preset time period is earlier than the second preset time period; determining whether the current deviation of the first preset time period and the current deviation of the second preset time period are numerically equal; if the current deviation of the first preset time period and the current deviation of the second preset time period are numerically equal, determining that a drift error occurs in the relay protection transmitter; wherein the drift error indicates that the difference between the current value of the first feeder collected by the relay protection transmitter and the actual current value of the first feeder is greater than a first preset difference threshold, or the difference between the current value of the second feeder collected by the relay protection transmitter and the actual current value of the second feeder is greater than a second preset difference threshold, or the difference between the current value of the incoming line collected by the relay protection transmitter and the actual current value of the incoming line is greater than a third difference threshold.

[0058] In an embodiment of the present application, the first preset time period and the second preset time period are both current deviations in time periods in units of minutes. If the current deviation of the first preset time period is equal to the current deviation of the second preset time period, it is determined that a drift error occurs in the relay protection transmitter; that is, if the sum of the current value of the first feeder and the current value of the second feeder remains consistent with the current deviation value of the incoming line for a long time, it is determined that a drift error occurs in the relay protection transmitter; the drift error indicates that the difference between the current value of the first feeder collected by the relay protection transmitter and the actual current value of the first feeder is greater than a preset difference threshold, or the difference between the current value of the second feeder collected by the relay protection transmitter and the actual current value of the second feeder is greater than a second preset difference threshold, or the difference between the current value of the incoming line collected by the relay protection transmitter and the actual current value of the incoming line is greater than a third difference threshold, for example, the actual current value is 1000A, the measured current value is 1020A, the actual current value is 300A, the measured current value is 320A, then the error is a fixed value of 20A.

[0059] Specifically, the error value curve is constructed by calculating the difference method, calculating the difference between the current value of the first feeder at different times and the actual current value of the first feeder, and fitting multiple differences into the error value curve in the order of the times, and the percentage of the difference to the current value of the first feeder is the first preset difference threshold. If the difference threshold is greater than 10% of the current value of the first feeder, it means that the error value curve between the calculated current value of the first feeder and the actual current value of the first feeder has changed. At this time, the current value of the first feeder needs to be updated, and the counter of the unchanged error value curve is cleared; if the difference is less than 10% of the current value of the first feeder, it means that the calculated current value of the first feeder is different from the actual current value of the first feeder. If the error value curve of the actual current value does not change, the counter counts +1; if the error value curve does not change and the counter reaches 10, it means that the error value curve remains consistent and the error value curve has not changed, then it is determined that the relay protection transmitter has not had a drift error. Whether a drift error has occurred in the relay protection transmitter is determined by checking whether the difference curve between the current value of the first feeder and the actual current value of the first feeder has changed. Whether a drift error has occurred in the relay protection transmitter is quickly determined by calculating whether the difference between the current value of the first feeder and the actual current value of the first feeder is greater than a preset difference threshold. In addition, fault detection is accurate to avoid false alarms due to small range fluctuations.

[0060] Similarly, to determine whether the drift error curve changes, the method of calculating the difference can be used, or the difference between the current value of the second feeder and the actual current value of the second feeder can be calculated; to determine whether the relay protection transmitter has a drift error by checking whether the difference curve between the second feeder current value and the second feeder current value changes; to determine whether the drift error curve changes, the method of calculating the difference can be used, or the difference between the current value of the incoming line and the actual current value of the incoming line can be calculated; to determine whether the relay protection transmitter has a drift error by checking whether the difference curve between the current value of the incoming line and the current value of the incoming line changes.

[0061] Figure 7 FIG. 1 is a flow chart of a fault judgment method for a relay protection transmitter provided by another exemplary embodiment of the present application. Figure 7 As shown, step 505 can be specifically implemented as follows: based on the fault diagnosis conditions, determining whether the relay protection transmitter is faulty includes: obtaining the current deviation in multiple continuous time periods; determining the change state of the current deviation in each continuous time period; if there are a preset number of identical change states, determining that a multiplier error occurs in the relay protection transmitter; wherein the multiplier error indicates that the ratio between the current value of the first feeder collected by the relay protection transmitter and the actual current value of the first feeder is greater than a first preset ratio threshold value, or the ratio between the current value of the second feeder collected by the relay protection transmitter and the actual current value of the second feeder is greater than a second preset ratio threshold value, or the ratio between the current value of the incoming line collected by the relay protection transmitter and the actual current value of the incoming line is greater than a third preset ratio threshold value.

[0062] In an embodiment of the present application, the change state of the current deviation in each continuous time period is calculated by calculating the difference, by calculating the average current deviation in the time period in minutes, that is, calculating the difference between the average value of the current deviation in the current time period and the average value of the current deviation in the future time period, the current time period is the current minute, and the future time period is the next minute. If the difference is greater than 0, it means that its change state is increasing; if the difference is less than 0, it means that its change state is decreasing; if the difference is 0, it means that the relay protection transmitter has a multiplier error. The multiplier error indicates that the ratio between the current value of the first feeder collected by the relay protection transmitter and the actual current value of the first feeder is greater than a first preset ratio threshold. For example, the actual current value of the relay protection transmitter is 1000A, and the measured current value is 1200A. The actual current value is 100A, and the measured current value is 120A. Then the error is 0.2 times the actual value, and the multiplier error is 0.2 times.

[0063] In order to prevent curve fluctuations caused by system oscillation, the time is calculated in minutes. For example, the change state (increasing state or decreasing state or multiple error) of the difference between the average value of the current deviation in the current time period and the average value of the current deviation in the historical time period is the same for at least 8 times within 10 minutes. For example, the change state of the difference between the average value of the current deviation in the current time period and the average value of the current deviation in the historical time period is increasing, and the change state is increasing for at least 8 times within 10 minutes, then it is considered that the difference changes with the incoming current value.

[0064] Figure 8 FIG. 1 is a flow chart of a fault judgment method for a relay protection transmitter provided by another exemplary embodiment of the present application. Figure 8 As shown, step 506 can be specifically implemented as follows: based on the fault diagnosis conditions, determining whether the relay protection transmitter is faulty includes: calculating the average current value of the first feeder within a third preset time period; calculating the average current value of the first feeder within a fourth preset time period; wherein the third preset time period is earlier than the fourth preset time period; calculating the difference between the average current value of the first feeder within the third preset time period and the average current value of the first feeder within the fourth preset time period; if the difference is greater than a preset difference threshold, determining that the relay protection transmitter is faulty.

[0065] In an embodiment of the present application, the third preset time period and the fourth preset time period both calculate the average value of the current value within the time period in units of hours. By calculating the difference between the average value of the current value of the first feeder within the third preset time period and the average value of the current value of the first feeder within the fourth preset time period, if the difference is greater than the preset difference threshold, it is determined that the relay protection transmitter has a fault.

[0066] Similarly, by calculating the difference between the average current value of the second feeder in the third preset time period and the average current value of the second feeder in the fourth preset time period, if the difference is greater than the preset difference threshold, it is determined that the relay protection transmitter has a fault; it is also possible to calculate the difference between the average current value of the incoming line in the third preset time period and the average current value of the incoming line in the fourth preset time period, if the difference is greater than the preset difference threshold, it is determined that the relay protection transmitter has a fault.

[0067] Fig. 9 FIG. 1 is a schematic diagram of a fault judgment device for a relay protection transmitter provided by another exemplary embodiment of the present application. Fig. 9As shown, the fault judgment device 20 includes a first current acquisition module 201, which is used to acquire the current value of the first feeder sent by the relay protection transmitter; a second current acquisition module 202, which is used to acquire the current value of the second feeder sent by the relay protection transmitter; a third current acquisition module 203, which is used to acquire the incoming line current value sent by the relay protection transmitter; wherein the first feeder, the second feeder and the incoming line are all electrically connected to the relay protection transmitter; a calculation module 204, which is used to calculate the current deviation according to the current value of the first feeder, the current value of the second feeder and the incoming line current value; a first determination module 205, which is used to determine whether to start the fault diagnosis operation according to the current deviation and the fault starting condition; a second determination module 206, which is used to determine whether the relay protection transmitter is faulty based on the fault diagnosis condition if the fault diagnosis operation is started.

[0068] In one embodiment, the calculation module 204 can be specifically configured to: calculate the sum of the current value of the first feeder and the current value of the second feeder; wherein the time points of the current value of the first feeder, the current value of the second feeder and the current value of the incoming line are the same; calculate the current deviation between the sum and the current value of the incoming line.

[0069] In one embodiment, the calculation module 204 may be specifically configured to: if the current deviation is greater than the current value of the incoming line, then start a fault diagnosis operation.

[0070] In one embodiment, the second determination module 206 may be specifically configured to: if the fault diagnosis operation is started, determine whether the incoming line circuit breaker, the first feeder circuit breaker, and the second feeder circuit breaker are disconnected; wherein the incoming line circuit breaker is electrically connected to the incoming line, the first feeder circuit breaker is electrically connected to the first feeder, and the second feeder circuit breaker is electrically connected to the second feeder;

[0071] If the incoming line circuit breaker, the first feeder circuit breaker, and the second feeder circuit breaker are not disconnected, it is determined whether the relay protection transmitter is faulty based on a fault diagnosis condition.

[0072] In one embodiment, the second determination module 206 can be specifically configured to: determine whether the current value of the first feeder or the current value of the second feeder or the current value of the incoming line collected by the relay protection transmitter are equal in value within a preset time period; if it is determined that the current value of the first feeder or the current value of the second feeder or the current value of the incoming line collected by the relay protection transmitter are equal in value within a preset time period, it is determined that the relay protection transmitter has a circuit breaker fault.

[0073] In one embodiment, the second determination module 206 can be specifically configured as follows: obtaining an error value curve; wherein the error value curve includes a current deviation of a first preset time period and a current deviation of a second preset time period, and the first preset time period is earlier than the second preset time period; determining whether the current deviation of the first preset time period and the current deviation of the second preset time period are numerically equal; if the current deviation of the first preset time period and the current deviation of the second preset time period are numerically equal, determining that a drift error occurs in the relay protection transmitter; wherein the drift error indicates that the difference between the current value of the first feeder collected by the relay protection transmitter and the actual current value of the first feeder is greater than a first preset difference threshold, or the difference between the current value of the second feeder collected by the relay protection transmitter and the actual current value of the second feeder is greater than a second preset difference threshold, or the difference between the current value of the incoming line collected by the relay protection transmitter and the actual current value of the incoming line is greater than a third difference threshold.

[0074] In one embodiment, the second determination module 206 can be specifically configured as follows: obtaining the current deviation within multiple continuous time periods; determining the change state of the current deviation within each continuous time period; if there are a preset number of identical change states, determining that a multiplier error occurs in the relay protection transmitter; wherein the multiplier error indicates that the ratio between the current value of the first feeder collected by the relay protection transmitter and the actual current value of the first feeder is greater than a first preset ratio threshold, or the ratio between the current value of the second feeder collected by the relay protection transmitter and the actual current value of the second feeder is greater than a second preset ratio threshold, or the ratio between the current value of the incoming line collected by the relay protection transmitter and the actual current value of the incoming line is greater than a third preset ratio threshold.

[0075] In one embodiment, the second determination module 206 can be specifically configured as follows: calculating the average current value of the first feeder within a third preset time period; calculating the average current value of the first feeder within a fourth preset time period; wherein the third preset time period is earlier than the fourth preset time period; calculating the difference between the average current value of the first feeder within the third preset time period and the average current value of the first feeder within the fourth preset time period; if the difference is greater than a preset difference threshold, determining that the relay protection transmitter is faulty.

[0076] Fig.10 FIG. 1 is a schematic diagram of the structure of a relay protection transmitter provided by another exemplary embodiment of the present application. Fig.10As shown, the relay protection device includes: a DC bus 1; a first feeder circuit breaker 21, the output end of the first feeder circuit breaker 21 is electrically connected to the input end of the locomotive 5 through the first feeder 2, and the input end of the first feeder circuit breaker 21 is electrically connected to the DC bus 1; a second feeder circuit breaker 31, the output end of the second feeder circuit breaker 31 is electrically connected to the input end of the locomotive 5 through the second feeder 3, and the input end of the second feeder circuit breaker 31 is electrically connected to the DC bus 1, The first feeder 2 is electrically connected to the second feeder 3; an incoming line circuit breaker 41, the input end of the incoming line circuit breaker 41 is electrically connected to the output end of the rail 6 through the incoming line 4, and is electrically connected to the DC bus 1 through the incoming line circuit breaker 41; a relay protection transmitter 7, the relay protection transmitter 7 is electrically connected to the first feeder 2, the second feeder 3 and the incoming line 4 respectively, and the relay protection transmitter 7 is used to collect the current value of the first feeder 2, the current value of the second feeder 3 and the current value of the incoming line 4.

[0077] In one embodiment, the relay protection device can be specifically configured as follows: the input end of the first feeder circuit breaker 21 is electrically connected to the DC bus 1, and the output end of the first feeder circuit breaker 21 is electrically connected to the input end of the locomotive 5 through the first feeder 2; the input end of the second feeder circuit breaker 31 is electrically connected to the DC bus 1, and the output end of the second feeder circuit breaker 31 is electrically connected to the input end of the locomotive 5 through the second feeder 3, the input end of the incoming line circuit breaker 41 is electrically connected to the output end of the rail 6 through the incoming line 4, and the output end of the incoming line circuit breaker 41 is electrically connected to the DC bus. The feeder end generally refers to the overhead line. Most of the distance from one station to another, the locomotive 5 needs to obtain current from the feeder end. The locomotive obtains current through the second feeder 3, and then flows back to the input end of the incoming line 4 through the rail 6. The first feeder 2 obtains current through the voltage and current transmitter, and the relay protection transmitter reads the current signal of the voltage and current transmitter. The second feeder 3 obtains current through the voltage and current transmitter, and the relay protection transmitter reads the current signal of the voltage and current transmitter. The DC bus 1 is used to convert the DC current of the first feeder 2 and the second feeder 3 into AC current, and then the locomotive 5 obtains AC current through the feeder. The relay protection device can significantly improve the safety and reliability of the subway power system by obtaining the current of the feeder and the incoming line, thereby realizing accurate monitoring of the status of the subway relay protection transmitter, greatly reducing the risk caused by fault delays.

[0078] The specific implementation method of the present application is: obtaining the current value of the first feeder 2 sent by the relay protection transmitter; obtaining the current value of the second feeder 3 sent by the relay protection transmitter; obtaining the current value of the incoming line sent by the relay protection transmitter, the first calculation module calculates the sum of the current value of the first feeder and the current value of the second feeder, the second calculation module calculates the current deviation between the sum and the current value of the incoming line, and determines whether to start the fault diagnosis operation based on the current deviation and the fault starting condition. If the current deviation is greater than the current value of the incoming line, the fault diagnosis operation is started, otherwise, the fault diagnosis operation is not started.

[0079] If the incoming line circuit breaker, the first feeder circuit breaker and the second feeder circuit breaker are disconnected, the system exits the fault judgment program and is handed over to manual judgment; if the incoming line circuit breaker, the first feeder circuit breaker and the second feeder circuit breaker are not disconnected, indicating that there is no tripping, then it is judged whether the current value of the first feeder or the current value of the second feeder or the current value of the incoming line are equal within the preset time period. If it is determined that the current value of the first feeder or the current value of the second feeder or the current value of the incoming line collected by the relay protection transmitter are equal within the preset time period (the current value has not changed for more than 10S), it is determined that the relay protection transmitter has a circuit breaker fault.

[0080] If a short circuit fault occurs in the relay protection transmitter, it can be determined that a drift error occurs in the relay protection transmitter by judging that the current deviation in the first preset time period is equal to the current deviation in the second preset time period, and the first preset time period is earlier than the second preset time period; wherein the drift error indicates that the error value of the data collected by the relay protection transmitter is a fixed value; if a fault occurs in the relay protection transmitter, it can be determined that a multiplier error occurs in the relay protection transmitter by judging the current deviation in multiple consecutive time periods, and the change state of the current deviation in each time period is the same, that is, the difference between the current deviation in the previous time period and the current deviation in the next time period is 0, wherein the multiplier error indicates that the change state of the current deviation of the data collected by the relay protection transmitter in the continuous time is the same; if the difference between the current deviation in the previous time period and the current deviation in the next time period is greater than 0, it means that the change state is an increasing state, and if the difference between the current deviation in the previous time period and the current deviation in the next time period is less than 0, it means that the change state is a decreasing state.

[0081] If a circuit breaker fault occurs in the relay protection transmitter, the difference between the average current value of the first feeder or the second feeder or the incoming line within the third preset time period and the average current value of the first feeder or the second feeder or the incoming line within the fourth preset time period is calculated; if the difference is greater than the preset difference threshold of 10%, it is determined that the relay protection transmitter is faulty.

[0082] This application not only improves the accuracy of fault detection by analyzing the current values ​​of the feeder and incoming line at the same time, but also monitors the working status of the relay protection transmitter in real time, greatly reducing the risk caused by fault delays. By setting a 10% difference threshold, it can ensure the monitoring sensitivity while avoiding false alarms due to small-range fluctuations, further improving the practicality and reliability of the system.

[0083] Fig.11 A block diagram of an electronic device according to an embodiment of the present application is illustrated.

[0084] like Fig.11 As shown, the electronic device 10 includes one or more processors 11 and a memory 12 .

[0085] The processor 11 may be a central processing unit (CPU) or other forms of processing units having data processing capabilities and / or instruction execution capabilities, and may control other components in the electronic device 10 to perform desired functions.

[0086] The memory 12 may include one or more computer program products, and the computer program product may include various forms of computer-readable storage media, such as volatile memory and / or non-volatile memory. The volatile memory may include, for example, random access memory (RAM) and / or cache memory (cache), etc. The non-volatile memory may include, for example, read-only memory (ROM), hard disk, flash memory, etc. One or more computer program instructions may be stored on the computer-readable storage medium, and the processor 11 may run the program instructions to implement the fault judgment method of the relay protection transmitter of each embodiment of the present application described above and / or other desired functions. Various contents such as input signals, signal components, noise components, etc. may also be stored in the computer-readable storage medium.

[0087] In one example, the electronic device 10 may further include: an input device 13 and an output device 14 , and these components are interconnected via a bus system and / or other forms of connection mechanisms (not shown).

[0088] When the electronic device is a stand-alone device, the input device 13 may be a communication network connector, which is used to receive the collected input signals from the first device and the second device.

[0089] In addition, the input device 13 may also include, for example, a keyboard, a mouse, and the like.

[0090] The output device 14 can output various information to the outside, including the determined distance information, direction information, etc. The output device 14 can include, for example, a display, a speaker, a printer, a communication network and a remote output device connected thereto, and the like.

[0091] Of course, to simplify, Fig.11 Only some of the components related to the present application in the electronic device 10 are shown, and components such as a bus, an input / output interface, etc. are omitted. In addition, according to specific application situations, the electronic device 10 may also include any other appropriate components.

[0092] The computer program product may be written in any combination of one or more programming languages ​​to write program codes for performing the operations of the embodiments of the present application, including object-oriented programming languages, such as Java, C++, etc., and conventional procedural programming languages, such as "C" language or similar programming languages. The program code may be executed entirely on the user computing device, partially on the user device, as an independent software package, partially on the user computing device and partially on a remote computing device, or entirely on a remote computing device or server.

[0093] The computer readable storage medium can adopt any combination of one or more readable media. The readable medium can be a readable signal medium or a readable storage medium. The readable storage medium can include, for example, but is not limited to, a system, device or device of electricity, magnetism, light, electromagnetic, infrared, or semiconductor, or any combination of the above. More specific examples (non-exhaustive list) of readable storage media include: an electrical connection with one or more wires, a portable disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the above.

[0094] The above description has been given for the purpose of illustration and description. In addition, this description is not intended to limit the embodiments of the present application to the forms disclosed herein. Although multiple example aspects and embodiments have been discussed above, those skilled in the art will recognize certain variations, modifications, changes, additions and sub-combinations thereof.

Claims

1. A fault judgment method based on a relay protection transmitter with time-stamp telemetry, characterized in that: include: Obtain the current value of the first feeder sent by the relay protection transmitter; wherein the relay protection transmitter is electrically connected to the first feeder; obtain the current value of the second feeder sent by the relay protection transmitter; wherein the relay protection transmitter is electrically connected to the second feeder; obtain the current value of the incoming line sent by the relay protection transmitter; wherein the relay protection transmitter is electrically connected to the incoming line; calculate the current deviation according to the current value of the first feeder, the current value of the second feeder and the current value of the incoming line; The calculating the current deviation according to the current value of the first feeder, the current value of the second feeder and the current value of the incoming line comprises: calculating the sum of the current value of the first feeder and the current value of the second feeder; wherein the time points of the current value of the first feeder, the current value of the second feeder and the current value of the incoming line are the same; and calculating the current deviation between the sum and the current value of the incoming line; Determining whether to start a fault diagnosis operation according to the current deviation and the fault starting condition, wherein determining whether to start a fault diagnosis operation according to the current deviation and the fault starting condition comprises: if the current deviation is greater than the current value of the incoming line, starting the fault diagnosis operation; If the fault diagnosis operation is started, then based on the fault diagnosis condition, it is determined whether the relay protection transmitter is faulty. If the fault diagnosis operation is started, then based on the fault diagnosis condition, it is determined whether the relay protection transmitter is faulty, including: if the fault diagnosis operation is started, it is determined whether the incoming line circuit breaker, the first feeder circuit breaker, and the second feeder circuit breaker are disconnected; wherein the incoming line circuit breaker is electrically connected to the incoming line, the first feeder circuit breaker is electrically connected to the first feeder, and the second feeder circuit breaker is electrically connected to the second feeder; if the incoming line circuit breaker, the first feeder circuit breaker, and the second feeder circuit breaker are not disconnected, then based on the fault diagnosis condition, it is determined whether the relay protection transmitter is faulty.

2. A fault judgment method based on relay protection transmitter with time-stamp telemetry according to claim 1, characterized in that: The method of determining whether the relay protection transmitter is faulty based on the fault diagnosis condition includes: determining whether the current value of the first feeder, the current value of the second feeder, or the current value of the incoming line collected by the relay protection transmitter are equal in value within a preset time period; if it is determined that the current value of the first feeder, the current value of the second feeder, or the current value of the incoming line collected by the relay protection transmitter are equal in value within a preset time period, it is determined that the relay protection transmitter has a circuit breaker fault.

3. A fault judgment method based on relay protection transmitter with time-stamp telemetry according to claim 1, characterized in that: The method of determining whether the relay protection transmitter is faulty based on the fault diagnosis condition includes: obtaining an error value curve; wherein the error value curve includes a current deviation of a first preset time period and a current deviation of a second preset time period, and the first preset time period is earlier than the second preset time period; determining whether the current deviation of the first preset time period and the current deviation of the second preset time period are numerically equal; if the current deviation of the first preset time period and the current deviation of the second preset time period are numerically equal, determining that a drift error occurs in the relay protection transmitter; wherein the drift error indicates that the difference between the current value of the first feeder collected by the relay protection transmitter and the actual current value of the first feeder is greater than a first preset difference threshold; or the difference between the current value of the second feeder collected by the relay protection transmitter and the actual current value of the second feeder is greater than a second preset difference threshold; or the difference between the current value of the incoming line collected by the relay protection transmitter and the actual current value of the incoming line is greater than a third difference threshold.

4. A fault judgment method based on relay protection transmitter with time-stamp telemetry according to claim 1, characterized in that: The method of determining whether the relay protection transmitter is faulty based on the fault diagnosis condition includes: obtaining the current deviation in multiple continuous time periods; determining the change state of the current deviation in each continuous time period; if there are a preset number of identical change states, determining that the relay protection transmitter has a multiplier error; wherein the multiplier error indicates that the ratio between the current value of the first feeder collected by the relay protection transmitter and the actual current value of the first feeder is greater than a first preset ratio threshold; or the ratio between the current value of the second feeder collected by the relay protection transmitter and the actual current value of the second feeder is greater than a second preset ratio threshold; or the ratio between the current value of the incoming line collected by the relay protection transmitter and the actual current value of the incoming line is greater than a third preset ratio threshold.

5. A fault judgment method based on relay protection transmitter with time-stamp telemetry according to claim 1, characterized in that: The method of determining whether the relay protection transmitter is faulty based on the fault diagnosis condition includes: calculating the average current value of the first feeder within a third preset time period; calculating the average current value of the first feeder within a fourth preset time period; wherein the third preset time period is earlier than the fourth preset time period; calculating the difference between the average current value of the first feeder within the third preset time period and the average current value of the first feeder within the fourth preset time period; if the difference is greater than a preset difference threshold, determining that the relay protection transmitter is faulty.

6. A fault judgment device based on a relay protection transmitter with time-stamp telemetry, characterized in that: include: A first current acquisition module, used to acquire a current value of a first feeder sent by a relay protection transmitter; A second current acquisition module, used to acquire the current value of the second feeder sent by the relay protection transmitter; a third current acquisition module, for acquiring the incoming line current value sent by the relay protection transmitter; wherein the first feeder, the second feeder, and the incoming line are all electrically connected to the relay protection transmitter; a calculation module, for calculating the current deviation according to the current value of the first feeder, the current value of the second feeder, and the incoming line current value, wherein the current deviation is calculated by: calculating the sum of the current value of the first feeder and the current value of the second feeder; a first determination module, for determining whether to start the fault diagnosis operation according to the current deviation and the fault start condition, and if the current deviation is greater than the current value of the incoming line, the fault diagnosis operation is started; a second determination module, for determining whether the relay protection transmitter is faulty based on a fault diagnosis condition if the fault diagnosis operation is started; and determining whether the incoming line circuit breaker, the first feeder circuit breaker, and the second feeder circuit breaker are disconnected if the fault diagnosis operation is started; wherein the incoming line circuit breaker is electrically connected to the incoming line, the first feeder circuit breaker is electrically connected to the first feeder, and the second feeder circuit breaker is electrically connected to the second feeder; and if the incoming line circuit breaker, the first feeder circuit breaker, and the second feeder circuit breaker are not disconnected, determining whether the relay protection transmitter is faulty based on a fault diagnosis condition.

7. A relay protection device, characterized in that: The fault judgment device comprises the fault judgment device as claimed in claim 6: a DC bus; a first feeder circuit breaker, the output end of the first feeder circuit breaker is electrically connected to the input end of the locomotive through the first feeder, and the input end of the first feeder circuit breaker is electrically connected to the DC bus; a second feeder circuit breaker, the output end of the second feeder circuit breaker is electrically connected to the input end of the locomotive through the second feeder, the input end of the second feeder circuit breaker is electrically connected to the DC bus, and the first feeder is electrically connected to the second feeder; an incoming line circuit breaker, the input end of the incoming line circuit breaker is electrically connected to the output end of the rail through the incoming line, and the output end of the incoming line circuit breaker is electrically connected to the DC bus; a relay protection transmitter, the relay protection transmitter is electrically connected to the first feeder, the second feeder and the incoming line respectively, and the relay protection transmitter is used to collect the current value of the first feeder, the current value of the second feeder and the current value of the incoming line.

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