Method for quickly positioning fault of protection trip and operation loop

Abstract

The invention provides a method for quickly positioning faults of a protection tripping and operation loop, which comprises the following steps of: performing potential monitoring on key nodes of a closing coil loop and a tripping coil loop between a relay protection loop operation box and an operation mechanism by using a non-contact direct-current electric field inductive sensor, and simultaneously performing fault positioning by using a station-end MMS (Multimedia Message Service) message; the method comprises the following steps: extracting an SCD file with position information of an operation mechanism, obtaining the switching state of the operation mechanism, and combining key node potential information of a closing coil loop and a tripping coil loop between a relay protection loop operation box and the operation mechanism and the switching state information of the operation mechanism based on the working principle of power system plant station end relay protection equipment; and logic analysis is carried out on fault types between the relay protection loop operation box and the operation mechanism so as to realize rapid and accurate positioning of faults.

Description

Technical Field

[0001] The invention relates to the technical field of relay protection, and in particular to a method for quickly locating protection tripping and operating circuit faults. Background Art

[0002] As important equipment in the field of power transformation, the relay protection circuit operation box and the operating mechanism belong to the primary and secondary professions respectively. The safe and reliable operation of the two plays a vital role in the stability of the power system. To distinguish the disconnection and short-circuit faults on the relay protection output circuit, the traditional method usually judges by checking the power supply, testing the switch status, testing the connection line and other steps; the intelligent terminal can judge whether there is a disconnection and short-circuit fault in the relay protection output circuit through voltage detection, current detection, fault indicator light, connection status detection, data communication anomalies and other methods. However, the above two methods cannot accurately locate whether the scope of the disconnection is on the primary equipment operating mechanism side or on the secondary equipment operating box side, which causes great difficulties and waste of manpower and material resources for troubleshooting and operation and maintenance.

[0003] The prior art also has methods for locating such faults. For example, Chinese patent document CN116559598B records a method and system for locating faults in a smart distribution network. The method automatically adjusts dynamic factors according to the real-time electrical parameters, environmental parameters and historical fault data of the distribution network; and integrates the dynamic factors with the historical fault data and the topological structure to form a multi-dimensional fault location model; predicts the fault location according to the multi-dimensional fault location model to obtain a prediction result, and judges the confidence of the prediction result; and determines the fault location of the distribution network according to the prediction result and the confidence corresponding to the prediction result. This invention requires obtaining multi-dimensional data such as real-time electrical parameters, environmental parameters and historical fault data of the distribution network, and has high requirements for the quality of the data source; the stability and robustness of the multi-dimensional fault location model are difficult to control, and this method belongs to the distribution system and cannot be used in the power generation and transformation field.

[0004] Patent document CN1167176C records a distribution network relay protection and fault location system, and proposes a new distribution network relay protection and fault location system, which uses the polarity characteristics of the fault component current to first form a new digital relay-polarity detection and comparison relay, which detects and compares the similarities and differences of the polarities of all fault component currents flowing through the protected distribution equipment to determine whether the equipment has a fault; then uses communication means to connect all relays of the same protected equipment to achieve relay protection of all distribution lines, distribution buses and distribution transformers; finally, the current polarity information is transmitted to the dispatching center, and the staff can quickly find the fault location, thereby realizing rapid fault location. This invention first needs to detect and compare the similarities and differences of the polarities of all fault component currents flowing through the protected distribution equipment to determine whether the equipment has a fault, but for the related circuits of the relay protection circuit operation box, it is in a dormant state for a long time, and there is no current and other excitation response characteristics, so it is impossible to locate the fault between the relay protection circuit operation box and the operating mechanism, and this method also belongs to the distribution system and cannot be used in the power generation and transformation field. Summary of the invention

[0005] The present invention provides a method for quickly locating protection tripping and operating circuit faults, performs logical analysis on the fault type between a relay protection circuit operating box and an operating mechanism, and further realizes fast and accurate positioning of the fault.

[0006] In order to solve the above technical problems, the technical solution adopted by the present invention is: The method for quickly locating protection tripping and operation circuit faults includes: The non-contact DC electric field induction method is used to monitor the setting nodes of the closing coil circuit and the tripping coil circuit between the relay protection circuit operation box and the operating mechanism; Combine the operating mechanism's throwing and pulling status with the setting node potential information of the closing coil circuit and the tripping coil circuit between the relay protection circuit operation box and the operating mechanism, and perform logical analysis based on the working principle of the power system plant-side protection device to judge the fault between the relay protection circuit operation box and the operating mechanism. The above-mentioned operating mechanism activation and deactivation status comes from the network distribution device installed at the station control layer. The network distribution device obtains the MMS message from the MMS switch, extracts the operating mechanism tripping and closing status information from the station control layer message, and pushes it to the fault rapid positioning system management unit between the relay protection operation circuit operation box and the operating mechanism; the management unit collects the key node potential information of the closing coil circuit and the tripping coil circuit between the relay protection circuit operation box and the operating mechanism through the DC electric field sensor, and combines the operating mechanism tripping and closing status information to determine the relevant status of the exit circuit.

[0007] The above-mentioned monitoring of the setting nodes of the closing coil circuit and the tripping coil circuit between the relay protection circuit operation box and the operating mechanism includes: Install the DC electric field sensor test point 1 at the connection point between the relay protection circuit operation box and the operating mechanism closing coil circuit; A DC electric field sensor test point 2 is installed at the key node between the relay protection circuit operation box and the operating mechanism tripping coil circuit. The operating circuit power supply is 220V, that is, the positive pole is +110V and the negative pole is -110V.

[0008] The above logical analysis and judgment include: When the operating mechanism is in the closing position, the test potential of detection point 1 is 0V, which is consistent with the closing coil circuit disconnected and potential-free state, and the primary side operating mechanism and the secondary side operating box are working normally; When the potential of test point 1 is +110V, this state is inconsistent with the standard state of test point 1 0V, and there is a short circuit fault of the protection circuit HJ. The fault range can be determined to be the secondary side protection device, and the secondary operation and maintenance personnel are responsible for maintenance; When the test potential of test point 1 is -110V, this state is inconsistent with the standard state of test point 1 0V. There is a short circuit fault between the closing coil circuit and the negative pole of the operating power supply. The fault range can be determined to be the secondary side protection device, and the secondary operation and maintenance personnel are responsible for maintenance; When the potential of test point 1 is +220V, this state is inconsistent with the standard state of test point 1 0V, there is a short circuit fault in the protection circuit HJ, and at the same time, there is a grounding fault of the negative pole of the protection circuit operation power supply. This fault needs to be checked for two situations: DC grounding and protection circuit HJ short circuit. These two types of faults belong to the scope of the secondary side protection device and are repaired by the secondary operation and maintenance personnel; When the test potential of test point 1 is -220V, this state is inconsistent with the standard state of test point 1 0V. There is a short circuit fault between the closing coil circuit and the negative pole of the operating power supply. At the same time, there is a grounding fault of the positive pole of the protection circuit operating power supply. This fault needs to be checked for two situations: DC grounding of the operating power supply and short circuit between the closing coil circuit and the negative pole of the operating power supply. These two types of faults belong to the scope of the secondary side protection device and are repaired and handled by the secondary operation and maintenance personnel.

[0009] The above logical analysis and judgment include: When the operating mechanism is in the closing position, the test potential of detection point 2 is -110V, which meets the working state of the trip coil circuit protection device, and the primary side operating mechanism and the secondary side operating box are working normally; When the test potential of detection point 2 is 0V, there is a disconnection between the primary side operating mechanism and the operating box or a disconnection of the negative pole of the operating power supply. This fault requires checking the connection between the operating mechanism and the operating box. The scope is the primary side protection device, which is the responsibility of the primary operation and maintenance personnel. When the test potential of detection point 2 is +110V, there is a disconnection between the primary side operating mechanism and the operating box, or a disconnection of the negative pole of the operating power supply, or a short circuit fault of the operating circuit TJ. This fault requires checking the connection between the operating mechanism and the operating box, and its scope is the primary side protection device, which is the responsibility of the primary operation and maintenance personnel. At the same time, the secondary operation and maintenance personnel check the disconnection of the operating power supply of the protection device and the TJ short circuit problem. When the test potential of detection point 2 is -220V, this state is inconsistent with the standard state of test point 2 -110V, but the polarity is the same. The primary side operating mechanism and the secondary side operating box are working normally. There is a DC grounding fault at the positive pole of the protection device operating power supply. Secondary operation and maintenance personnel need to be arranged to troubleshoot the fault. When the test potential of detection point 2 is -220V, this state is inconsistent with the standard state of test point 2 -110V, but the polarity is the same. The primary side operating mechanism and the secondary side operating box are working normally. At this time, a DC grounding fault occurs at the positive pole of the operating power supply of the protection device. It is necessary to arrange secondary operation and maintenance personnel to troubleshoot the fault. When the test potential of detection point 2 is +220V, this state is inconsistent with the standard state of -110V of test point 2, and the polarity is opposite. There is a disconnection between the primary side operating mechanism and the operating box or a disconnection of the negative pole of the operating power supply. At the same time, there is a short circuit in the operating circuit TJ and a negative grounding fault in the protection device. The positive pole of the operating power supply is clamped to +220V. This fault requires the primary operation and maintenance personnel to check the disconnection between the primary side operating mechanism and the operating box, and the secondary operation and maintenance personnel to check the disconnection of the negative pole of the operating power supply and the grounding problem of the negative pole of the operating power supply.

[0010] The above logical analysis and judgment include: When the operating mechanism is in the open position, the test potential of detection point 1 is -110V, which meets the working state of the closing coil circuit protection device, and the primary side operating mechanism and the secondary side operating box are working normally; When the test potential of detection point 1 is 0V, there is a disconnection between the primary side operating mechanism and the operating box or a disconnection of the negative pole of the operating power supply. This fault requires checking the connection between the operating mechanism and the operating box. The scope is the primary side protection device, which is the responsibility of the primary operation and maintenance personnel. When the test potential of detection point 1 is +110V, there is a disconnection between the primary side operating mechanism and the operating box or a disconnection of the negative pole of the operating power supply. At the same time, there is a short circuit fault in the operating circuit HJ. This fault requires checking the connection between the operating mechanism and the operating box. Its scope is the primary side protection device, which is repaired by the primary operation and maintenance personnel. At the same time, arrange the secondary operation and maintenance personnel to check the disconnection of the operating power supply of the protection device and the HJ short circuit problem. When the test potential of detection point 1 is -220V, this state is inconsistent with the standard state of test point 1 -110V, but the polarity is the same. The primary side operating mechanism and the secondary side operating box are working normally. At this time, there is a DC grounding fault at the positive pole of the protection device operating power supply. It is necessary to arrange secondary operation and maintenance personnel to troubleshoot the fault; When the test potential of detection point 1 is +220V, this state is inconsistent with the standard state of -110V at test point 2, but the polarity is opposite. There is a disconnection between the primary side operating mechanism and the operating box or a disconnection of the negative pole of the operating power supply. At the same time, there is an operating circuit HJ short circuit and a negative pole grounding fault of the protection device. This fault requires the primary operation and maintenance personnel to check the disconnection between the primary side operating mechanism and the operating box, and the secondary operation and maintenance personnel to check the grounding of the negative pole of the operating power supply, the short circuit of the protection circuit HJ, and the disconnection of the negative pole of the operating power supply.

[0011] The above logical analysis and judgment include: When the operating mechanism is in the open position, the test potential of detection point 2 is 0V, which is consistent with the trip coil circuit disconnected and potential-free state, and the primary side operating mechanism and the secondary side operating box are working normally; When the potential of test point 2 is +110V, this state is inconsistent with the standard state of test point 2 0V, and there is a short circuit fault in the protection circuit TJ. The fault range is the secondary side protection device, and the secondary operation and maintenance personnel are responsible for repair; When the test potential of test point 2 is -110V, this state is inconsistent with the standard state of test point 2 0V. There is a short circuit fault between the trip coil circuit and the negative pole of the operating power supply. The fault range is the secondary side protection device, and the secondary operation and maintenance personnel are responsible for maintenance; When the potential of test point 2 is +220V, this state is inconsistent with the standard state of test point 2 0V, there is a short circuit fault in the protection circuit TJ, and at the same time, there is a grounding fault of the negative pole of the protection circuit operation power supply. This fault needs to be checked for two situations: DC grounding and short circuit of the protection circuit TJ. These two types of faults belong to the scope of the secondary side protection device and are repaired by the secondary operation and maintenance personnel; When the test potential of test point 2 is -220V, this state is inconsistent with the standard state of test point 2 0V. There is a short circuit fault between the closing coil circuit and the negative pole of the operating power supply. At the same time, there is a grounding fault of the positive pole of the protection circuit operating power supply. This fault needs to be checked for two situations: DC grounding of the operating power supply and short circuit between the closing coil circuit and the negative pole of the operating power supply. These two types of faults belong to the scope of the secondary side protection device and are repaired and handled by the secondary operation and maintenance personnel.

[0012] The present invention provides a method for quickly locating protection tripping and operating circuit faults. A non-contact DC electric field induction sensor is used to monitor the potential of a closing coil circuit and a key node of a tripping coil circuit between a relay protection circuit operation box and an operating mechanism. At the same time, a station-side MMS message is used to extract an SCD file with operating mechanism position information, obtain the operating mechanism throw-in / out status, and combine the potential information of the closing coil circuit and the key node of the tripping coil circuit between the relay protection circuit operation box and the operating mechanism and the operating mechanism throw-in / out status information. Based on the working principle of the power system plant-side relay protection equipment, a logical analysis is performed on the fault type between the relay protection circuit operation box and the operating mechanism, thereby realizing rapid and accurate fault positioning. The present invention has the following beneficial effects: 1) Rapidly locate the fault area: By performing information fusion logic analysis on the operating mechanism's throw-in and throw-out status and the key node status of the closing coil circuit and the tripping coil circuit between the relay protection circuit operation box and the operating mechanism, the fault type and fault responsibility area can be quickly determined, which saves a lot of time and manpower compared to traditional fault troubleshooting methods.

[0013] 2) Improve the accuracy of fault diagnosis: Traditional methods need to rely on experience and trial and error methods when troubleshooting. The method proposed in this invention is based on multi-data information fusion logic analysis, which can more accurately judge the fault and eliminate other possibilities.

[0014] 3) Accurate operation and maintenance: According to the fault analysis results of this method, the station-side on-duty personnel can accurately distinguish whether the fault between the relay protection operation circuit operation box and the operating mechanism belongs to the primary or secondary profession, and can quickly notify the corresponding operation and maintenance personnel to troubleshoot the fault. Through the rapid positioning of the fault point by the present invention, the maintenance personnel can directly deal with the problem, reducing the delay of the maintenance process. The operation and maintenance personnel can carry the required tools and spare parts to the maintenance site in a targeted manner, reducing unnecessary maintenance costs and waste of resources.

[0015] 4) Data analysis and fault prediction: The present invention can monitor the operating mechanism's throw-in and throw-out status and the key node information of the closing coil circuit and the tripping coil circuit between the relay protection circuit operation box and the operating mechanism in real time, and can send the collected information to the third-party management system of the station control layer in accordance with the DL / T860 protocol, thereby realizing remote monitoring of the circuit status between the station-end relay protection circuit operation box and the operating mechanism, and analyzing and logically judging the real-time status data to realize fault prediction of the circuit between the station-end relay protection circuit operation box and the operating mechanism. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The present invention will be further described below in conjunction with the accompanying drawings and embodiments: Figure 1 This is the framework diagram of the fault rapid location system between the relay protection operation circuit operation box and the operating mechanism; Figure 2 Schematic diagram of potential monitoring for key nodes of closing coil circuit and tripping coil circuit; Figure 3 This is the fault logic judgment flow chart of the operation loop test point 1; Figure 4 This is the fault logic judgment flow chart of operation loop test point 2. DETAILED DESCRIPTION

[0017] In order to make the purpose, technical solutions and advantages of the present invention clearer, the following content will systematically and completely describe the specific technical solutions of the present invention in combination with the drawings provided according to the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0018] Example: The present invention proposes a method for quickly locating faults between an operating box and an operating mechanism of a relay protection operating circuit. The main principle is to use a non-contact DC electric field induction sensor to monitor the potential of key nodes of a closing coil circuit and a tripping coil circuit between the relay protection circuit operating box and the operating mechanism, and at the same time use a station-side MMS message to extract an SCD file with the location information of the operating mechanism, obtain the operating mechanism's on / off status, and combine the potential information of key nodes of the closing coil circuit and the tripping coil circuit between the relay protection circuit operating box and the operating mechanism and the operating mechanism's on / off status information, based on the working principle of the relay protection equipment at the plant and station end of the power system, perform a logical analysis of the fault type between the relay protection circuit operating box and the operating mechanism, thereby realizing rapid and accurate positioning of the fault.

[0019] Features: First: Use non-contact DC electric field induction technology to monitor the key nodes of the closing coil circuit and the tripping coil circuit between the relay protection circuit operation box and the operating mechanism; Second: Combine the operating mechanism's throw-in and throw-out status with the potential information of key nodes of the closing coil circuit and the tripping coil circuit between the relay protection circuit operating box and the operating mechanism, and perform logical analysis based on the actual working principle of the power system plant-side protection device to quickly and accurately determine the fault between the relay protection circuit operating box and the operating mechanism.

[0020] The system architecture block diagram of the method proposed in the present invention is shown in FIG1 . A network distribution device is installed at the station control layer to obtain an MMS message from the MMS switch. The network distribution device extracts the tripping and closing status information of the operating mechanism from the station control layer message and pushes it to the fault rapid positioning system management unit between the relay protection operation circuit operation box and the operating mechanism. The management unit collects the potential information of the key nodes of the closing coil circuit and the tripping coil circuit between the relay protection circuit operation box and the operating mechanism through a DC electric field sensor, and combines the tripping and closing status information of the operating mechanism to determine the relevant status of the export circuit, and sends the status information to the station control layer third-party system in accordance with the DL / T 860 protocol.

[0021] Combined with practical examples, such as Figure 2 As shown, a DC electric field sensor test point 1 is installed at a key node between the relay protection circuit operation box and the operating mechanism closing coil circuit, and a DC electric field sensor test point 2 is installed at a key node between the relay protection circuit operation box and the operating mechanism tripping coil circuit. The operating circuit power supply is 220V (positive pole is +110V, negative pole is -110V).

[0022] The specific judgment logic is as follows: Figure 3 , Figure 4 As shown: 1. When the operating mechanism is in the closing position, the test potential of detection point 1 is 0V, which is consistent with the closing coil circuit disconnected and potential-free state, and the primary side operating mechanism and the secondary side operating box are working normally; when the potential of test point 1 is +110V, this state is inconsistent with the standard state of test point 1 0V, such as Figure 2 As shown, the above situation is only caused when the protection circuit HJ is short-circuited. The fault range can be determined to be the secondary side protection device, and the secondary operation and maintenance personnel are responsible for maintenance; when the test potential of test point 1 is -110V, this state is inconsistent with the standard state of test point 1 0V, such as Figure 2 As shown, the above situation is only caused when the closing coil circuit is short-circuited with the negative pole of the operating power supply. The fault range can be determined to be the secondary side protection device, and the secondary operation and maintenance personnel are responsible for maintenance; when the potential of test point 1 is +220V, this state is inconsistent with the standard state of test point 1 0V, such as Figure 2 As shown in the figure, only when the protection circuit HJ is short-circuited, a positive voltage measurement value may appear at detection point 1. At the same time, only when the negative pole of the protection circuit operating power supply is grounded, the positive pole of the protection device operating power supply will be clamped to +220V. Therefore, this fault needs to be checked for two conditions: DC grounding and protection circuit HJ short circuit. Both of these fault types belong to the scope of the secondary side protection device and should be repaired and handled by the secondary operation and maintenance personnel. When the test potential of test point 1 is -220V, this state is inconsistent with the standard state of test point 1 0V, such as Figure 2As shown in the figure, only when the closing coil circuit and the negative pole of the operating power supply are short-circuited, a negative voltage measurement value may appear at detection point 1. At the same time, only when the positive pole of the operating power supply of the protection circuit is grounded, the negative pole of the operating power supply of the protection device will be clamped to -220V. Therefore, this fault needs to be checked for two situations: DC grounding of the operating power supply and short circuit between the closing coil circuit and the negative pole of the operating power supply. These two types of faults belong to the scope of the secondary side protection device and should be repaired and handled by the secondary operation and maintenance personnel; When the operating mechanism is in the closed position, the test potential of detection point 2 is -110V, which meets the working state of the trip coil circuit protection device, and the primary side operating mechanism and the secondary side operating box are working normally; when the test potential of detection point 2 is 0V, such as Figure 2 As shown in the figure, only when the line between the primary side operating mechanism and the operating box is broken or the negative pole of the operating power supply is broken can the above situation occur. Therefore, this fault first needs to check the connection between the operating mechanism and the operating box, which is the scope of the primary side protection device and is repaired by the primary operation and maintenance personnel; when the test potential of detection point 2 is +110V, if Figure 2 As shown, the above situation will only occur when there is a disconnection between the primary side operating mechanism and the operating box or the negative pole of the operating power supply is disconnected, and at the same time, the operating circuit TJ is short-circuited. Therefore, this fault first needs to check the connection between the operating mechanism and the operating box, and its scope is the primary side protection device, which is responsible for the primary operation and maintenance personnel; at the same time, arrange secondary operation and maintenance personnel to check the disconnection of the operating power supply of the protection device and the TJ short circuit problem; when the test potential of detection point 2 is -220V, this state is inconsistent with the standard state of test point 2 -110V, but the polarity is the same, such as Figure 2 As shown, the primary side operating mechanism and the secondary side operating box are working normally. At this time, the positive pole of the protection device operating power supply should be DC grounded, and secondary operation and maintenance personnel should be arranged to troubleshoot the fault; when the test potential of detection point 2 is -220V, this state is inconsistent with the standard state of test point 2 -110V, but the polarity is the same, such as Figure 2 As shown, the primary side operating mechanism and the secondary side operating box are working normally. At this time, the positive pole of the protection device operating power supply should be DC grounded, and secondary operation and maintenance personnel should be arranged to troubleshoot the fault; when the test potential of detection point 2 is +220V, this state is inconsistent with the standard state of test point 2 -110V, and the polarity is opposite, such as Figure 2 As shown, only when the line between the primary side operating mechanism and the operating box is broken or the negative pole of the operating power supply is broken, and at the same time, the operating circuit TJ is short-circuited, the negative pole of the protection device is grounded, and the positive pole of the operating power supply is clamped to +220V. Therefore, this fault requires the primary operation and maintenance personnel to check the line break between the primary side operating mechanism and the operating box, and the secondary operation and maintenance personnel to check the line break of the negative pole of the operating power supply and the grounding problem of the negative pole of the operating power supply; 2. When the operating mechanism is in the open position, the test potential of detection point 1 is -110V, which meets the working state of the closing coil circuit protection device, and the primary side operating mechanism and the secondary side operating box are working normally; when the test potential of detection point 1 is 0V, such as Figure 2 As shown in the figure, only when the line between the primary side operating mechanism and the operating box is broken or the negative pole of the operating power supply is broken can the above situation occur. Therefore, this fault first needs to check the connection between the operating mechanism and the operating box. The scope is the primary side protection device, which is the responsibility of the primary operation and maintenance personnel. When the test potential of detection point 1 is +110V, if Figure 2 As shown, the above situation will only occur when there is a disconnection between the primary side operating mechanism and the operating box or the negative pole of the operating power supply is disconnected, and at the same time, the operating circuit HJ is short-circuited. Therefore, this fault first needs to check the connection between the operating mechanism and the operating box, and its scope is the primary side protection device, which is responsible for the primary operation and maintenance personnel; at the same time, arrange secondary operation and maintenance personnel to check the disconnection of the operating power supply of the protection device and the HJ short circuit problem; when the test potential of detection point 1 is -220V, this state is inconsistent with the standard state of test point 1 -110V, but the polarity is the same, such as Figure 2 As shown, the primary side operating mechanism and the secondary side operating box are working normally. At this time, the positive pole of the protection device operating power supply should be DC grounded, and secondary operation and maintenance personnel should be arranged to troubleshoot the fault; when the test potential of detection point 1 is +220V, this state is inconsistent with the standard state of test point 2 -110V, but the polarity is opposite, such as Figure 2 As shown, only when the line between the primary side operating mechanism and the operating box is broken or the negative pole of the operating power supply is broken, and at the same time, the operating circuit HJ is short-circuited, the negative pole of the protection device is grounded, and the positive pole of the operating power supply is clamped to +220V. Therefore, this fault requires the primary operation and maintenance personnel to check the line break between the primary side operating mechanism and the operating box, and the secondary operation and maintenance personnel to check the grounding of the negative pole of the operating power supply, the short circuit of the protection circuit HJ, and the line break of the negative pole of the operating power supply; When the operating mechanism is in the open position, the test potential of detection point 2 is 0V, which is consistent with the trip coil circuit disconnected and potential-free state, and the primary side operating mechanism and the secondary side operating box are working normally; when the test point 2 is at a potential of +110V, this state is inconsistent with the standard state of test point 2 0V, such as Figure 2 As shown, the above situation is only caused when the protection circuit TJ is short-circuited. The fault range can be determined to be the secondary side protection device, and the secondary operation and maintenance personnel are responsible for maintenance; when the test potential of test point 2 is -110V, this state is inconsistent with the standard state of test point 2 0V, such as Figure 2 As shown, the above situation is only caused when the trip coil circuit is short-circuited with the negative pole of the operating power supply. The fault range can be determined to be the secondary side protection device, and the secondary operation and maintenance personnel are responsible for maintenance; when the potential of test point 2 is +220V, this state is inconsistent with the standard state of test point 2 0V, such as Figure 2As shown in the figure, only when the protection circuit TJ is short-circuited, a positive voltage measurement value may appear at the detection point 2. At the same time, only when the negative pole of the protection circuit operating power supply is grounded, the positive pole of the protection device operating power supply will be clamped to +220V. Therefore, this fault needs to check the two situations of DC grounding and protection circuit TJ short circuit. These two types of faults belong to the scope of the secondary side protection device and should be repaired and handled by the secondary operation and maintenance personnel; when the test potential of the test point 2 is -220V, this state is inconsistent with the standard state of the test point 2 0V, such as Figure 2 As shown in the figure, only when the closing coil circuit and the negative pole of the operating power supply are short-circuited, a negative voltage measurement value may appear at detection point 2. At the same time, only when the positive pole of the operating power supply of the protection circuit is grounded, the negative pole of the operating power supply of the protection device will be clamped to -220V. Therefore, this fault needs to be checked for two situations: DC grounding of the operating power supply and short circuit between the closing coil circuit and the negative pole of the operating power supply. These two types of faults belong to the scope of the secondary side protection device and should be repaired and handled by the secondary operation and maintenance personnel; Combined with the tripping and closing status of the operating mechanism, based on the sensor data of test point 1 and test point 2, the logical judgment enumeration of the fault rapid location method between the relay protection operation circuit operation box and the operating mechanism is shown in Table 1: Table 1 Application example of the method for fast fault location between the operating box and the operating mechanism of the relay protection operation circuit

Claims

1. A method for quickly locating protection tripping and operating circuit faults, characterized in that: include: The non-contact DC electric field induction method is used to monitor the setting nodes of the closing coil circuit and the tripping coil circuit between the relay protection circuit operation box and the operating mechanism; Combine the operating mechanism's throwing and pulling status with the setting node potential information of the closing coil circuit and the tripping coil circuit between the relay protection circuit operation box and the operating mechanism, and perform logical analysis based on the working principle of the power system plant-side protection device to judge the fault between the relay protection circuit operation box and the operating mechanism.

2. The method for quickly locating protection tripping and operating circuit faults according to claim 1, characterized in that: The operating mechanism's throwing and retreating status is derived from the network division device installed at the station control layer. The network division device obtains the MMS message from the MMS switch, extracts the operating mechanism's tripping and closing status information from the station control layer message, and pushes it to the fault rapid positioning system management unit between the relay protection operation circuit operation box and the operating mechanism; the management unit collects the key node potential information of the closing coil circuit and the tripping coil circuit between the relay protection circuit operation box and the operating mechanism through the DC electric field sensor, and judges the relevant status of the exit circuit in combination with the operating mechanism's tripping and closing status information.

3. The method for quickly locating protection tripping and operating circuit faults according to claim 2, characterized in that: The monitoring of the setting nodes of the closing coil circuit and the tripping coil circuit between the relay protection circuit operation box and the operating mechanism includes: Install the DC electric field sensor test point 1 at the connection point between the relay protection circuit operation box and the operating mechanism closing coil circuit; A DC electric field sensor test point 2 is installed at the key node between the relay protection circuit operation box and the operating mechanism tripping coil circuit. The operating circuit power supply is 220V, that is, the positive pole is +110V and the negative pole is -110V.

4. The method for quickly locating protection tripping and operating circuit faults according to claim 3, characterized in that: The logical analysis and judgment includes: When the operating mechanism is in the closing position, the test potential of detection point 1 is 0V, which is consistent with the closing coil circuit disconnected and potential-free state, and the primary side operating mechanism and the secondary side operating box are working normally; When the potential of test point 1 is +110V, this state is inconsistent with the standard state of test point 1 0V, and there is a short circuit fault of the protection circuit HJ. The fault range can be determined to be the secondary side protection device, and the secondary operation and maintenance personnel are responsible for maintenance; When the test potential of test point 1 is -110V, this state is inconsistent with the standard state of test point 1 0V. There is a short circuit fault between the closing coil circuit and the negative pole of the operating power supply. The fault range can be determined to be the secondary side protection device, and the secondary operation and maintenance personnel are responsible for maintenance; When the potential of test point 1 is +220V, this state is inconsistent with the standard state of test point 1 0V, there is a short circuit fault in the protection circuit HJ, and at the same time, there is a grounding fault of the negative pole of the protection circuit operation power supply. This fault needs to be checked for two situations: DC grounding and protection circuit HJ short circuit. These two types of faults belong to the scope of the secondary side protection device and are repaired by the secondary operation and maintenance personnel; When the test potential of test point 1 is -220V, this state is inconsistent with the standard state of test point 1 0V. There is a short circuit fault between the closing coil circuit and the negative pole of the operating power supply. At the same time, there is a grounding fault of the positive pole of the protection circuit operating power supply. This fault needs to be checked for two situations: DC grounding of the operating power supply and short circuit between the closing coil circuit and the negative pole of the operating power supply. These two types of faults belong to the scope of the secondary side protection device and are repaired and handled by the secondary operation and maintenance personnel.

5. The method for quickly locating protection tripping and operating circuit faults according to claim 3, characterized in that: The logical analysis and judgment includes: When the operating mechanism is in the closing position, the test potential of detection point 2 is -55V, which meets the working state of the trip coil circuit protection device, and the primary side operating mechanism and the secondary side operating box are working normally; When the test potential of detection point 2 is 0V, there is a disconnection between the primary side operating mechanism and the operating box or a disconnection of the negative pole of the operating power supply. This fault requires checking the connection between the operating mechanism and the operating box. The scope is the primary side protection device, which is the responsibility of the primary operation and maintenance personnel. When the test potential of detection point 2 is +110V, there is a disconnection between the primary side operating mechanism and the operating box, or a disconnection of the negative pole of the operating power supply, or a short circuit fault of the operating circuit TJ. This fault requires checking the connection between the operating mechanism and the operating box, and its scope is the primary side protection device, which is the responsibility of the primary operation and maintenance personnel. At the same time, the secondary operation and maintenance personnel check the disconnection of the operating power supply of the protection device and the TJ short circuit problem. When the test potential of detection point 2 is -220V, this state is inconsistent with the standard state of test point 2 -110V, but the polarity is the same. The primary side operating mechanism and the secondary side operating box are working normally. There is a DC grounding fault at the positive pole of the protection device operating power supply. Secondary operation and maintenance personnel need to be arranged to troubleshoot the fault. When the test potential of detection point 2 is -220V, this state is inconsistent with the standard state of test point 2 -110V, but the polarity is the same. The primary side operating mechanism and the secondary side operating box are working normally. At this time, a DC grounding fault occurs at the positive pole of the operating power supply of the protection device. It is necessary to arrange secondary operation and maintenance personnel to troubleshoot the fault. When the test potential of detection point 2 is +220V, this state is inconsistent with the standard state of -110V of test point 2, and the polarity is opposite. There is a disconnection between the primary side operating mechanism and the operating box or a disconnection of the negative pole of the operating power supply. At the same time, there is a short circuit in the operating circuit TJ and a negative grounding fault in the protection device. The positive pole of the operating power supply is clamped to +220V. This fault requires the primary operation and maintenance personnel to check the disconnection between the primary side operating mechanism and the operating box, and the secondary operation and maintenance personnel to check the disconnection of the negative pole of the operating power supply and the grounding problem of the negative pole of the operating power supply.

6. The method for quickly locating protection tripping and operating circuit faults according to claim 3, characterized in that: The logical analysis and judgment includes: When the operating mechanism is in the open position, the test potential of detection point 1 is -110V, which meets the working state of the closing coil circuit protection device, and the primary side operating mechanism and the secondary side operating box are working normally; When the test potential of detection point 1 is 0V, there is a disconnection between the primary side operating mechanism and the operating box or a disconnection of the negative pole of the operating power supply. This fault requires checking the connection between the operating mechanism and the operating box. The scope is the primary side protection device, which is the responsibility of the primary operation and maintenance personnel. When the test potential of detection point 1 is +110V, there is a disconnection between the primary side operating mechanism and the operating box or a disconnection of the negative pole of the operating power supply. At the same time, there is a short circuit fault in the operating circuit HJ. This fault requires checking the connection between the operating mechanism and the operating box. Its scope is the primary side protection device, which is repaired by the primary operation and maintenance personnel. At the same time, arrange the secondary operation and maintenance personnel to check the disconnection of the operating power supply of the protection device and the HJ short circuit problem. When the test potential of detection point 1 is -220V, this state is inconsistent with the standard state of test point 1 -110V, but the polarity is the same. The primary side operating mechanism and the secondary side operating box are working normally. At this time, there is a DC grounding fault at the positive pole of the protection device operating power supply. It is necessary to arrange secondary operation and maintenance personnel to troubleshoot the fault; When the test potential of detection point 1 is +220V, this state is inconsistent with the standard state of -110V at test point 2, but the polarity is opposite. There is a disconnection between the primary side operating mechanism and the operating box or a disconnection of the negative pole of the operating power supply. At the same time, there is an operating circuit HJ short circuit and a negative pole grounding fault of the protection device. This fault requires the primary operation and maintenance personnel to check the disconnection between the primary side operating mechanism and the operating box, and the secondary operation and maintenance personnel to check the grounding of the negative pole of the operating power supply, the short circuit of the protection circuit HJ, and the disconnection of the negative pole of the operating power supply.

7. The method for quickly locating protection tripping and operating circuit faults according to claim 3, characterized in that: The logical analysis and judgment includes: When the operating mechanism is in the open position, the test potential of detection point 2 is 0V, which is consistent with the trip coil circuit disconnected and potential-free state, and the primary side operating mechanism and the secondary side operating box are working normally; When the potential of test point 2 is +110V, this state is inconsistent with the standard state of test point 2 0V, and there is a short circuit fault in the protection circuit TJ. The fault range is the secondary side protection device, and the secondary operation and maintenance personnel are responsible for repair; When the test potential of test point 2 is -110V, this state is inconsistent with the standard state of test point 2 0V. There is a short circuit fault between the trip coil circuit and the negative pole of the operating power supply. The fault range is the secondary side protection device, and the secondary operation and maintenance personnel are responsible for maintenance; When the potential of test point 2 is +220V, this state is inconsistent with the standard state of test point 2 0V, there is a short circuit fault in the protection circuit TJ, and at the same time, there is a grounding fault of the negative pole of the protection circuit operation power supply. This fault needs to be checked for two situations: DC grounding and short circuit of the protection circuit TJ. These two types of faults belong to the scope of the secondary side protection device and are repaired by the secondary operation and maintenance personnel; When the test potential of test point 2 is -220V, this state is inconsistent with the standard state of test point 2 0V. There is a short circuit fault between the closing coil circuit and the negative pole of the operating power supply. At the same time, there is a grounding fault of the positive pole of the protection circuit operating power supply. This fault needs to be checked for two situations: DC grounding of the operating power supply and short circuit between the closing coil circuit and the negative pole of the operating power supply. These two types of faults belong to the scope of the secondary side protection device and are repaired and handled by the secondary operation and maintenance personnel.

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