Relay protection device monitoring method, control equipment, relay protection device and medium

Abstract

The invention relates to the technical field of power distribution network relay protection, in particular to a relay protection device monitoring method, a control device, a relay protection device and a medium. The difference value is a fault if the difference value exceeds a set normal threshold value, the difference value is normal if the difference value does not exceed the set normal threshold value, monitoring can be carried out at any time, when the fault occurs, detailed division is conveniently carried out according to areas, equipment and cables, a worker can conveniently, rapidly and accurately locate a fault point location, and the work efficiency is improved. According to the invention, while the monitoring effect is achieved, the timeliness of maintenance can be promoted, and unnecessary loss caused by troublesome troubleshooting and the like is avoided.

Description

Technical Field

[0001] The present invention relates to the field of relay protection of power distribution networks, and in particular to a monitoring method, control equipment, a relay protection device and a medium. Background Art

[0002] As the structures of various types of equipment in my country's power system become increasingly complex, with more types and functions, more problems are beginning to emerge. Therefore, in order to maintain system safety, the important role of relay protection devices is gradually becoming apparent. Therefore, if the monitoring and maintenance of relay protection devices are not given sufficient attention, the overall maintenance costs of the equipment will eventually continue to rise. As related technologies continue to develop, the original electromagnetic relay protection devices are likely to be gradually replaced by microcomputer relay protection devices to ensure the overall reliability of electrical equipment operation and improve related performance.

[0003] However, the following problems were found in the implementation of relevant technologies: in the existing technology, the maintenance of relay protection devices is still mainly based on regular maintenance. Such a model will lead to a certain extent that equipment hidden dangers are not properly resolved and repaired, which will further increase the overall cost of maintenance, or the failure to troubleshoot and maintain the fault point in time when a problem occurs may cause unnecessary losses. In view of this, a method for monitoring relay protection faults in a distribution network containing distributed power sources is provided to overcome the above-mentioned defects. Summary of the Invention

[0004] The purpose of the present invention is to solve the shortcomings of the prior art and to propose a monitoring method for a relay protection device, a control device, a relay protection device and a medium.

[0005] In order to achieve the above object, the present invention adopts the following technical solution: a method for monitoring a relay protection device comprises the following steps:

[0006] The system collects currents from both ends of the relay protection device of the distributed distribution network by introducing current through the main control terminal of the monitoring device, and calculates the vector sum of the currents at both ends. The vector sum of the currents at both ends of the protected line is compared with the conventional recorded value. If the difference exceeds the set threshold, it indicates a fault; if it does not exceed the threshold, it indicates normal.

[0007] If a fault occurs, for different areas of the relay protection device, the equipment and the branch cables of different functions of the corresponding equipment are coded to quickly locate the area, equipment and line. The current vectors of the inflow and outflow lines of different areas are sensed by mutual inductors, and the current vector sums of the inflow and outflow lines of different areas are calculated respectively. The current vector sums are compared with the conventional recorded values ​​to obtain the difference. If the difference in a certain area exceeds the specified threshold, the currents at both ends of different equipment in the area are detected respectively, and the current vector sums of the inflow and outflow lines of different equipment are calculated. The current vector sums are compared with the conventional recorded values ​​to obtain the difference. If the difference in a certain equipment exceeds the specified threshold, the currents at both ends of different branch cables in the equipment are detected respectively, and the current vector sums of the inflow and outflow lines of different branch cables are calculated respectively. The current vector sums are compared with the conventional recorded values ​​to obtain the difference. If the difference exceeds the specified threshold, the branch cables of the equipment in this area are determined to be the fault point.

[0008] Secondary detailed data collection is performed on the fault point detected in the previous step. The electrical state values ​​of current and voltage are obtained in the secondary detailed data collection. These state values ​​are compared with the conventional values ​​to extract the additional quantities generated by the fault. The cause of the fault is determined based on the different additional values.

[0009] Through sample training and maintenance records, a rule base is established, which is used to define the reasonable range of the difference in the data comparison process in the above steps;

[0010] According to the fault cause analysis, the external factors are obtained and then the danger level is determined to determine whether it affects safe operation;

[0011] After eliminating external factors, internal factors are obtained based on the cause of the fault, and corresponding solutions are proposed for the fault problem.

[0012] Optionally, current is introduced through the main control terminal of the monitoring device to collect the current at both ends of the relay protection device, and the vector sum of the currents at both ends is calculated. The vector sum of the currents at both ends of the protected line is compared with the conventional recorded value. If the comparison difference exceeds the set threshold, it is a fault; if it does not exceed the set threshold, it is normal. The steps include:

[0013] Convert the analog quantity of the vector of the current at both ends into a digital quantity;

[0014] Digital quantity transmits data to the other end through communication;

[0015] At the opposite end, a comparative analysis is performed between the digital value of the sum of the current vectors at both ends of the relay protection device and the digital value of the conventional recorded value.

[0016] Optionally, when performing comparative analysis between the digital quantity of the current vector sum at both ends of the relay protection device and the digital quantity of the conventional recorded value at the other end, a high-precision synchronous clock is installed to synchronize the current data at both ends to ensure the synchronization of the current data collection at both ends of the relay protection device.

[0017] Optionally, for different areas of the distribution network, encoding devices and branch cables of different functions of the corresponding devices includes the following steps:

[0018] Encoding is performed after regional division;

[0019] Encoding for different devices in the same area;

[0020] Code each branch cable of the same device.

[0021] Optionally, secondary detailed data collection is performed for the fault point detected in the previous step. In the secondary detailed data collection, electrical quantity state values ​​of current and voltage are obtained. The state values ​​are compared with conventional values ​​to extract additional quantities generated during the fault. The cause of the fault is determined based on different additional values. Confirming the fault point includes the following steps:

[0022] Establish a database;

[0023] Measurement and collection of relevant electrical quantities such as current and voltage;

[0024] Convert digital signals and transmit them;

[0025] Compare the collected electrical quantities with those in non-fault states;

[0026] Confirm the fault point;

[0027] Quickly determine the cause of the fault.

[0028] Optionally, the steps of converting and transmitting digital signals include: converting and transmitting digital signals; digitizing the collected signals, and the accuracy and sampling frequency after conversion must meet the requirements for fault component extraction.

[0029] Optionally, a rule base is established through sample training, maintenance records, etc. The rule base is used to improve the comprehensiveness, accuracy and timeliness of the monitoring process, and stipulates the reasonable range of the difference in the data comparison process in the above steps, including the following steps;

[0030] Fault sample training;

[0031] External input and record upload;

[0032] Establish a rule base;

[0033] Establish a wide-area measurement system.

[0034] According to a second aspect of an embodiment of the present disclosure, there is provided a control device for a relay protection device, comprising:

[0035] The first detection module detects the current at both ends of the relay protection device, the current at both ends of different areas of the relay protection device, the current at both ends of different equipment in the area, and the current at both ends of different branch cables in the equipment;

[0036] The first comparison module compares the detected current vector sum with the conventional recorded data to determine the fault point;

[0037] The second detection module detects the electrical quantity state values ​​of current and voltage at the fault point;

[0038] The second comparison module compares the status value with the normal value, extracts the additional value generated when the fault occurs, and determines the cause of the additional value according to the rules of the rule base;

[0039] The first analysis module determines whether the additional value is caused by external factors. If not, the second analysis module is activated to analyze internal factors based on the additional value.

[0040] According to a third aspect of an embodiment of the present disclosure, there is provided a relay protection device, comprising:

[0041] processor;

[0042] a memory for storing processor-executable instructions;

[0043] The processor is configured to execute the executable instructions to implement the steps of the method in any one of the above embodiments.

[0044] According to a fourth aspect of an embodiment of the present disclosure, a computer-readable storage medium is provided, on which a computer program is stored. When the computer program is executed by a processor, the steps of the method described in any one of the above embodiments are implemented.

[0045] The present invention has the following beneficial effects:

[0046] The relay protection device monitoring method designed by the present invention first senses the current vector flowing into and out of the line through a mutual inductor, converts it into a digital quantity through a data acquisition unit, and then uploads it to the main control terminal of the monitoring device for comparison with the conventional recorded value to obtain a difference. If it exceeds the set normal threshold, it is a fault; if it does not exceed, it is normal. Monitoring can be carried out at all times. When a fault occurs, it is convenient to make detailed divisions according to areas, equipment and cables, which facilitates staff to quickly and accurately locate the fault point. While achieving a monitoring effect, it can promote the timeliness of maintenance and avoid excessive troubleshooting, which leads to unnecessary losses.

[0047] The relay protection device monitoring method designed by the present invention collects electrical quantities through a mutual inductor and then converts them into digital form. In the event of an asymmetric short-circuit fault, the negative-sequence component and the zero-sequence component exist for a long time. This feature is used to obtain the zero-sequence and negative-sequence components, and then the fault type and special phase are determined according to the phase selection result. The positive-sequence fault quantity is then derived according to the boundary adjustment. In this way, the fault quantity can be obtained for a long time, and the obtained fault quantity can be prevented from fluctuating due to interference. After comparison with the non-fault state electrical quantity stored in the database, the cause of the fault can be quickly determined. This determination method is assembled in each distribution network's subordinate area to avoid the scope being too large to affect the determination efficiency or the heavy computational burden.

[0048] The relay protection device monitoring method designed in the present invention constitutes a neural network algorithm, which is composed of an input layer, a hidden layer and an output layer. First, through training with a large number of fault samples, the input electrical quantity characteristics are mapped to the output layer to realize the identification and classification of the fault type and location. It can mark the fault category and location based on the collected current, voltage and other data and past records, and match the corresponding solution. At the same time, it can also cooperate with the rule base established through expert experience for reasoning, and cooperate with the establishment of a wide-area measurement system to further improve the accuracy and comprehensiveness of the overall monitoring. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] Figure 1 It is a schematic diagram of the workflow of the present invention;

[0050] Figure 2 Schematic diagram of the workflow of step S1 of the present invention;

[0051] Figure 3 Schematic diagram of the workflow of step S2 of the present invention;

[0052] Figure 4 Schematic diagram of step S2 coding table of the present invention;

[0053] Figure 5 Schematic diagram of the workflow of step S3 of the present invention;

[0054] Figure 6 Schematic diagram of the workflow of step S4 of the present invention. DETAILED DESCRIPTION

[0055] Reference Figure 1-6 The present invention provides a method for monitoring a relay protection device, comprising the following steps:

[0056] S1. Current is introduced through the main control terminal of the monitoring device to collect the current at both ends of the relay protection device of the distributed distribution network, and the vector sum of the currents at both ends is calculated. The vector sum of the currents at both ends of the protected line is compared with the conventional recorded value. If the comparison difference exceeds the set threshold, it is a fault; if it does not exceed the threshold, it is normal. The current vector sum at both ends of the circuit is used to determine whether a fault has occurred.

[0057] S2. If a fault occurs, for different areas of the relay protection device, encode the equipment and the branch cables of different functions of the corresponding equipment, sense the current vectors of the inflow and outflow lines of different areas through mutual inductors, calculate the current vector sum of the inflow and outflow lines of different areas respectively, compare the current vector sum with the conventional recorded value to obtain a difference value, and if the difference value of a certain area exceeds a specified threshold value, detect the currents at both ends of different equipment in the area respectively, calculate the current vector sum of the inflow and outflow lines of different equipment, and compare the current vector sum with the conventional recorded value to obtain a difference value, and if the difference value of a certain equipment exceeds a specified threshold value, detect the currents at both ends of different branch cables in the equipment respectively, calculate the current vector sum of the inflow and outflow lines of different branch cables respectively, and compare the current vector sum with the conventional recorded value to obtain a difference value, and if the difference value exceeds the specified threshold value, determine that the branch cable of the equipment in this area is the fault point;

[0058] S3. Perform secondary detailed data collection on the fault point detected in the previous step. The electrical state values ​​of current and voltage are obtained in the secondary detailed data collection. These state values ​​are compared with conventional values ​​to extract additional quantities generated during the fault. The cause of the fault is determined based on the different additional values.

[0059] S4. Through sample training and maintenance records, a rule base is established to quickly identify the cause of the fault and the maintenance method when a fault occurs. Through a large number of fault sample training, the electrical quantity characteristics are memorized, and each maintenance record is recorded and backed up to establish a rule base to quickly identify the cause and determine the maintenance method.

[0060] S5. Analyze the external factors based on the cause of the fault and then determine the danger level to see if it affects safe operation. By comparing external factors such as signal interference and transformer influence, it is determined that the situation is low-risk. Routine maintenance can be performed in non-emergency situations to avoid wasting resources due to emergency treatment.

[0061] S6. Based on the fault cause analysis, the internal factors are obtained, and corresponding solutions are proposed and solved for the fault problem; after the fault cause and the repair method are matched with each other through the cooperation of the intelligent troubleshooting library, the maintenance and equipment management personnel in the area can be quickly screened, and relevant technical personnel can be selected in a targeted manner. At the same time, the solution is sent to the maintenance personnel's mobile phone to improve the timeliness of problem solving.

[0062] In one embodiment, current is introduced through the main control terminal of the monitoring device to collect the current at both ends of the relay protection device, and the vector sum of the currents at both ends is calculated. The vector sum of the currents at both ends of the protected line is compared with the conventionally recorded value. If the comparison difference exceeds a set threshold, a fault is detected; if it does not exceed a set threshold, a normal condition is detected. The steps include:

[0063] S101, converting the analog quantity of the vector of the current at both ends into a digital quantity;

[0064] S102, digital quantity is transmitted to the other end via communication;

[0065] S103. Compare and analyze the digital value of the sum of the current vectors at both ends of the relay protection device with the digital value of the conventional recorded value at the opposite end.

[0066] First, by comparing the data with the threshold data, the current vector at both ends of the protected line is compared and the conventional recorded value is subtracted. If it exceeds the set threshold, it is a fault, and if it does not exceed it, it is normal. After the fault is clear, the fault point is quickly determined by the numerical value through the coding of the area, equipment and cable. The fault point data is compared again to determine the cause of the fault, and the corresponding maintenance method is matched by the fault quantity data and the fault cause. If the external factors are in a low-risk state, routine maintenance can be carried out. If the internal factors are in a high-risk state, the corresponding maintenance personnel are quickly matched for rapid maintenance to improve the timeliness of the maintenance process.

[0067] As a further implementation plan for the above technical solution: data comparison and sorting, based on the current differential principle, determines whether a fault has occurred by measuring the current vector sum collected at both ends of the line. During normal operation or external faults, the vector sum of the currents flowing into and out of the line is almost zero. During internal faults, the vector sum is not zero, thus effectively determining whether a fault has occurred.

[0068] As a further implementation plan for the above technical solution: in the comparative analysis of the digital quantity of the current vector sum at both ends of the relay protection device and the digital quantity of the conventional recorded value, it is necessary to equip a high-precision synchronous clock to ensure that the current data at both ends are at the same time, otherwise misjudgment will occur; in order to ensure the accuracy of the current data collection at both ends, it is necessary to equip a high-precision synchronous clock to collect the values ​​at the same time node, so as to obtain accurate values ​​and maintain the accuracy of the monitoring process.

[0069] As a further implementation of the above technical solution: for different areas of the distribution network, encoding the equipment and the branch cables with different functions of the corresponding equipment includes the following steps:

[0070] S201, encode the divided regions to quickly search for the regions;

[0071] S202. Coding different devices in the same area to quickly search, query and confirm the devices;

[0072] S203. Encode the cables of each branch of the same device to quickly search, query and determine the cable branches.

[0073] As a further implementation plan of the above technical solution: the S101 is encoded as one, two, three... and so on, the S102 is encoded as A, B, C... and so on, and the S103 is encoded as K1, K2, K3... and so on; when a fault occurs, three groups of coding combinations are used, such as one BK3 or three AK2s, and a table is generated and uploaded to the main control terminal of the monitoring device at the same time, so that maintenance personnel can quickly determine the fault point, thereby avoiding the need for multiple investigations and inquiries, which is more troublesome and less efficient.

[0074] During specific implementation, first, the current vector flowing into and out of the line is sensed by the mutual inductor, converted into digital quantity by the data acquisition unit, and uploaded to the main control terminal of the monitoring device for comparison with the conventional recorded value to obtain the difference. If it exceeds the set normal threshold, it is a fault, and if it does not exceed it, it is normal. It can be monitored at all times. When a fault occurs, it is convenient to make detailed divisions according to areas, equipment and cables, so that the staff can quickly and accurately locate the fault point. While achieving the monitoring effect, it can promote the timeliness of maintenance and avoid the trouble of troubleshooting, which leads to unnecessary losses.

[0075] As a further implementation of the above technical solution: secondary detailed data collection is performed on the fault point detected in the previous step. The electrical quantity state values ​​of current and voltage are obtained in the secondary detailed data collection. The state values ​​are compared with conventional values ​​to extract additional quantities generated during the fault. The cause of the fault is determined based on different additional values. Confirming the fault point includes the following steps:

[0076] S301. Establish a database; record and back up data on multiple branch lines, equipment, etc.;

[0077] S302, measurement and collection of related electrical quantities such as current and voltage; used to measure signals such as current and voltage in the line, so as to extract additional quantities generated during a fault;

[0078] S303, digital signal conversion and transmission: converting the analog signal collected by the mutual inductor into a digital signal to facilitate later data analysis and comparison;

[0079] S304, comparing the collected electrical quantities with the electrical quantities in the non-fault state; the electrical quantities in the fault state are equal to the sum of the electrical quantities in the non-fault state and the electrical quantities in the fault-additional state;

[0080] S305, confirm the fault point; obtain the final fault point location based on the fault quantity comparison;

[0081] S306. Quickly determine the cause of the fault; obtain and analyze corresponding fault quantities based on electrical characteristics of different fault types.

[0082] As a further implementation plan of the above technical solution: the said S303, digital signal conversion and transmission; the collected signal is digitized, and the accuracy and sampling frequency after conversion must meet the requirements of fault component extraction; through the conversion of digital signals, high-precision and high-linearity analysis and accurate reflection of the fault components can be achieved, so as to accurately make instructions for the next step, and at the same time, it is used for data collection, reception, analysis and transmission through protection relays and communication equipment to ensure stability, speed and accuracy.

[0083] As a further implementation plan of the above technical solution: S306 ensures the signal time consistency of each collection point; uses a clock synchronization device to keep the time of the collected signal uniform, improves the accuracy of the data, and thus improves the accuracy of fault judgment; by controlling the time when collecting data, avoids internal current fluctuations or band influences, which lead to errors in the value, thereby affecting the judgment of the cause of the fault.

[0084] During specific implementation, electrical quantities are collected by mutual inductors and converted into digital form. In the case of asymmetric short-circuit faults, negative-sequence components and zero-sequence components exist for a long time. This feature is used to obtain zero-sequence and negative-sequence components, and then the fault type and special phase are determined based on the phase selection result. The positive-sequence fault quantity is then derived based on the boundary adjustment, so that the fault quantity can be obtained for a long time to avoid fluctuations caused by interference. After comparison with the non-fault state electrical quantities stored in the database, the cause of the fault can be quickly determined. This determination method is assembled in each distribution network's subordinate area to avoid a large range affecting the determination efficiency or a heavy computational burden.

[0085] As a further implementation of the above technical solution: the step S4, the intelligent screening library includes the following steps;

[0086] S401, fault sample training: by inputting and backing up a large number of fault samples, solutions to the faults can be quickly uploaded;

[0087] S402, external input and record upload; through external transmission and past maintenance records, data is constantly updated to avoid impacts and errors;

[0088] S403. Establish a rule base; perform reasoning based on the rule base established by expert experience to improve the safety of troubleshooting;

[0089] S404. Establish a wide area measurement system; establish a WAMS approach to improve the accuracy and comprehensiveness of synchronous monitoring.

[0090] As a further implementation plan of the above technical solution: S404, establishing a wide-area measurement system; with the help of its high-precision synchronous measurement technology and wide-area data, the distribution network can be fully monitored; the comprehensiveness and accuracy of the entire power distribution network monitoring process are improved, the fault point can be quickly determined and uploaded in time, and the processing efficiency of the work process is improved.

[0091] During specific implementation, a neural network algorithm is constructed, which consists of an input layer, a hidden layer, and an output layer. First, through training with a large number of fault samples, the input electrical quantity characteristics are mapped to the output layer to realize the identification and classification of the fault type and location. It can mark the fault category and location based on the collected current, voltage and other data and past records, and match the corresponding solution. At the same time, it can also cooperate with the rule base established through expert experience for reasoning, and cooperate with the establishment of a wide-area measurement system to further improve the accuracy and comprehensiveness of the overall monitoring.

[0092] According to a second aspect of an embodiment of the present disclosure, there is provided a control device for a relay protection device, comprising:

[0093] The first detection module detects the current at both ends of the relay protection device, the current at both ends of different areas of the relay protection device, the current at both ends of different equipment in the area, and the current at both ends of different branch cables in the equipment;

[0094] The first comparison module compares the detected current vector sum with the conventional recorded data to determine the fault point;

[0095] The second detection module detects the electrical quantity state values ​​of current and voltage at the fault point;

[0096] The second comparison module compares the status value with the normal value, extracts the additional value generated when the fault occurs, and determines the cause of the additional value according to the rules of the rule base;

[0097] The first analysis module determines whether the additional value is caused by external factors. If not, the second analysis module is activated to analyze internal factors based on the additional value.

[0098] According to a third aspect of an embodiment of the present disclosure, there is provided a relay protection device, comprising:

[0099] processor;

[0100] a memory for storing processor-executable instructions;

[0101] The processor is configured to execute the executable instructions to implement the steps of the method in any one of the above embodiments.

[0102] According to a fourth aspect of an embodiment of the present disclosure, a computer-readable storage medium is provided, on which a computer program is stored. When the computer program is executed by a processor, the steps of the method described in any one of the above embodiments are implemented.

[0103] Finally, it should be noted that the above are only preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent replacements for some of the technical features therein. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A method for monitoring a relay protection device, characterized in that: The following steps are involved: By introducing current at the main control end of the monitoring device, the current at both ends of the relay protection device of the distributed distribution network is collected, and the vector sum of the current at both ends is calculated. The vector sum of the current at both ends of the protected line is compared with the conventional recorded value. If the comparison difference exceeds the set threshold, it is a fault; If a fault occurs, for different areas of the relay protection device, the equipment and the branch cables of different functions of the corresponding equipment are encoded to quickly locate the area, equipment and line. The current vectors of the inflow and outflow lines of different areas are sensed by mutual inductors, and the current vector sums of the inflow and outflow lines of different areas are calculated respectively. The current vector sums are compared with the conventional recorded values ​​to obtain the difference. If the difference in a certain area exceeds the specified threshold, the currents at both ends of different equipment in the area are detected respectively, and the current vector sums of the inflow and outflow lines of different equipment are calculated, and the current vector sums are compared with the conventional recorded values ​​to obtain the difference. If the difference in a certain equipment exceeds the specified threshold, the currents at both ends of different branch cables in the equipment are detected respectively, and the current vector sums of the inflow and outflow lines of different branch cables are calculated respectively. The current vector sums are compared with the conventional recorded values ​​to obtain the difference. If the difference exceeds the specified threshold, the branch cables of the equipment in this area are determined to be the fault points.

2. The method for monitoring a relay protection device according to claim 1, characterized in that: The current is introduced through the main control end of the monitoring device, the current at both ends of the relay protection device is collected, and the vector sum of the current at both ends is calculated. The vector sum of the current at both ends of the protected line is compared and the conventional recorded value is subtracted. If the comparison difference exceeds the set threshold, it is a fault, and if it does not exceed the threshold, it is normal. The steps include: Convert the analog quantity of the vector of the current at both ends into a digital quantity; Digital quantity transmits data to the other end through communication; At the opposite end, a comparison analysis is performed between the digital quantity of the current vector sum at both ends of the relay protection device and the digital quantity of the conventional recorded value.

3. The method for monitoring a relay protection device according to claim 2, characterized in that: In the comparative analysis of the digital quantity of the current vector sum at both ends of the relay protection device with the digital quantity of the conventional recorded value, a high-precision synchronous clock is installed to synchronize the current data at both ends to ensure the synchronization of the current data collection at both ends of the relay protection device.

4. The method for monitoring a relay protection device according to claim 1, characterized in that: For different areas of the distribution network, encoding the equipment and the branch cables of different functions of the corresponding equipment includes the following steps: Encoding is performed after regional division; Encode for different devices in the same region; Code each branch cable of the same equipment.

5. The method for monitoring a relay protection device according to claim 1, characterized in that: Secondary detailed data collection is performed for the fault point detected in the previous step. The electrical quantity state values ​​of current and voltage are obtained in the secondary detailed data collection. The state values ​​are compared with conventional values, so that the additional quantities generated during the fault can be extracted. The cause of the fault is determined according to different additional values. Confirming the fault point includes the following steps: Establish database; Measurement and collection of relevant electrical quantities such as current and voltage; Digital signal conversion and transmission; Compare the collected electrical quantities with those in non-fault states; Confirm the fault point; Quickly determine the cause of the failure.

6. The method for monitoring a relay protection device according to claim 5, characterized in that: The steps of converting and transmitting digital signals include: converting and transmitting digital signals; digitizing the collected signals, and the accuracy and sampling frequency after conversion must meet the requirements for fault component extraction.

7. The method for monitoring a relay protection device according to claim 1, characterized in that: Through sample training, maintenance records, etc., a rule base is established. The rule base is used to improve the comprehensiveness, accuracy and timeliness of the monitoring process. The reasonable range of the difference in the data comparison process in the above steps is stipulated, including the following steps; Fault sample training; External input and record upload; Establish a rule base; Establish a wide-area measurement system.

8. A control device for a relay protection device, characterized in that: include: The first detection module detects the current at both ends of the relay protection device, the current at both ends of different areas of the relay protection device, the current at both ends of different equipment in the area, and the current at both ends of different branch cables in the equipment; The first comparison module compares the detected current vector sum with the conventional recorded data to determine the fault point; The second detection module detects the electrical quantity state values ​​of the current and voltage at the fault point; The second comparison module compares the state value with the normal value, extracts the additional value generated when the fault occurs, and determines the cause of the additional value according to the rules of the rule base; The first analysis module determines whether the additional value is caused by external factors. If not, the second analysis module is started to analyze internal factors based on the additional value.

9. A relay protection device, characterized in that: include: processor; a memory for storing processor-executable instructions; The processor is configured to execute the executable instructions to implement the steps of the method according to any one of claims 1 to 7.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 7 are implemented.

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