A relay protection test connection intelligent checking method

Abstract

The application provides a relay protection test connection intelligent checking method, belongs to the technical field of relay protection of power systems, and is suitable for protection device logic checking and debugging scenes in conventional substations. In view of the fact that existing test connection checking before relay protection debugging completely depends on manual visual inspection and hand feeling and lacks automatic checking means, the method comprises the following processing steps: secondary safety measure preparation, pre-debugging operation, system self-checking, ground state detection, test line contact state detection, device internal key node identification and checking result prompting. The application realizes intelligent checking of test connection of old equipment by reusing inherent debugging communication interfaces of conventional station protection devices, fills the technical blank in the field of conventional station loop automation readiness checking, effectively avoids damage of devices and power grid operation risks caused by connection errors through non-intrusive passive detection and hierarchical blocking mechanism, and improves the safety level of field operation.

Description

Technical Field

[0001] This invention belongs to the field of power system relay protection technology, specifically relating to an intelligent verification method for relay protection test wiring, applicable to logic verification and debugging scenarios of protection devices in conventional substations. Background Technology

[0002] Relay protection devices are the first line of defense for the safe and stable operation of power systems, and the correctness of their functions and performance directly affects the safe operation of the power grid. In field operations, the commissioning of protection devices is a crucial module for verifying the correct operating capability of the relay protection system. Commissioning work begins with setting up a test wiring circuit, which consists of testing instruments, dedicated test leads, current and voltage input terminals of the protection device, and related operating pressure plates. Correct connection of the test wiring circuit is a prerequisite for subsequent power-on testing, logic verification, and result determination. Therefore, correctly completing the connection and verification of the test wiring circuit is fundamental to ensuring the smooth progress of commissioning work.

[0003] Existing research mainly explores ways to improve the efficiency of relay protection commissioning from different dimensions such as visualization, automation, and intelligence. For example, Chinese patent CN 103400524 A proposes a method to visualize the commissioning of relay protection and secondary circuits, which generates visual action screens to intuitively display the commissioning process. Qian Hao et al. proposed an automatic test scheme for relay protection based on a digital tester, which uses the IEC 61850 monitoring backend to realize real-time setting of settings and remote remote control monitoring, so as to improve the test efficiency and accuracy (Qian Hao, Xing Haiqing, Han Yongqiang, et al. An implementation method of an automatic test scheme for relay protection [J]. Automation Instrumentation, 2015, 36(5): 71-74+79.). Some researchers have analyzed the commissioning method of relay protection in intelligent substations to improve the efficiency of on-site commissioning work (Zhai Hongxia, Wei Jie. A brief analysis of a commissioning method for relay protection in intelligent substations [J]. Electronic Production, 2014, (1): 230.). Another study proposed a data-driven method for automatic generation and autonomous verification of virtual circuits in smart substations. By parsing SCD files, the method automatically verifies the connection relationship of virtual terminals, aiming to reduce manual configuration errors and improve the level of commissioning automation (Huang Zhigao, Li Yan, Li Teng, et al. Design and implementation of automatic generation technology of virtual circuits in SCD files of smart substations [J]. Power System Protection and Control, 2017, 45(17): 106-111.).

[0004] Currently, in the commissioning of relay protection systems in conventional substations, the testing and wiring checks are performed manually by commissioning personnel. The specific procedure is as follows:

[0005] (1) After the commissioning personnel complete the connection of the test line between the tester and the protection device, they should visually check whether the grounding terminal of the tester is reliably grounded and confirm the tightness of the grounding clamp by touch.

[0006] (2) Check in turn whether the plugs of each current and voltage test leads have been inserted into the corresponding terminal holes of the protection device, and judge the tightness of the connection by hand-cranking the plugs;

[0007] (3) Check the engagement and disengagement positions of each functional pressure plate and outlet pressure plate on the protection device cabinet against the commissioning plan or setting notification sheet to see if they are consistent with the test requirements;

[0008] (4) For wiring points that are questionable upon visual inspection, use a multimeter in resistance mode to measure continuity for further confirmation.

[0009] This solution relies heavily on manual visual and tactile inspection. The completeness and accuracy of the inspection results depend heavily on the experience and meticulousness of the commissioning personnel. It lacks systematic and automated methods for verifying the readiness of test wiring, and has the following main shortcomings:

[0010] (1) Manual visual inspection is prone to oversights and habitual thinking. The test wiring inspection involves multiple items such as grounding of the test instrument, connection of multiple sets of current and voltage test lines, confirmation of the activation and deactivation of multiple functional pressure plates and output pressure plates. During repetitive inspections, debugging personnel are prone to skipping individual steps due to habitual thinking, or assuming that a certain item has been checked in place based on experience, resulting in missed inspections. Potential problems such as incorrect activation and deactivation of pressure plates and unreliable connection of grounding wires are easily overlooked.

[0011] (2) The connection status of the test leads cannot be reliably determined. The current and voltage test leads are connected to the terminals of the protection device through plugs. The contact status between the plug and the terminal hole can only be judged by hand and experience, which cannot accurately identify hidden problems such as loose connection, partial insertion, and poor contact. Loose connection in the current loop may cause abnormal test waveforms or even open circuit risk, affecting the safety of the device.

[0012] (3) Lack of systematic and automated test wiring readiness verification methods. The existing inspection methods rely entirely on manual item-by-item visual confirmation and multimeter-assisted continuity measurement. The completeness of the inspection results depends on the meticulousness and sense of responsibility of the commissioning personnel. There are no automated tools to determine the overall readiness of the test wiring circuit, making it difficult to guarantee inspection efficiency and reliability.

[0013] The above research indicates that improving the commissioning efficiency of relay protection devices and reducing the error rate of manual verification have become important technical issues that urgently need to be addressed in the field of routine substation maintenance operations. Summary of the Invention

[0014] The purpose of this invention is to provide an intelligent verification method for relay protection test wiring, addressing the problem that existing relay protection pre-commissioning test wiring inspection relies entirely on manual visual inspection and touch, lacking automated verification methods.

[0015] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0016] A method for intelligent verification of relay protection test wiring, comprising the following steps:

[0017] Step S1. Preparation of secondary safety measures and pre-debugging operations, including setting value verification and adjustment, test wiring, pressure plate activation and deactivation, and safety technical briefing before the implementation of secondary safety measures;

[0018] Step S2. System self-test, which is divided into pre-use laboratory self-test and on-site self-test without a source;

[0019] Step S3. Grounding status detection is achieved through the DC resistance detection module and DC voltage detection module integrated inside the relay protection tester;

[0020] Step S4. Test lead contact status detection, including test lead contact status detection, consistency comparison between wiring scheme and debugging task, and comprehensive judgment;

[0021] Step S5. Identification of key nodes inside the device: Obtain the status of key nodes related to the test circuit inside the device by communicating with the protection device, and perform hierarchical verification;

[0022] Step S6. Verification result prompt: A multi-module hierarchical summary judgment method is adopted to summarize and visualize the verification results of each module at each level. Anomaly cause classification and troubleshooting recommendations based on XGBoost are also adopted to enable the commissioning personnel to grasp the overall readiness status of the test wiring circuit before formal power-on.

[0023] Furthermore, this invention also proposes an intelligent verification device for relay protection test wiring, which includes the following functional modules:

[0024] The preparation and debugging of secondary safety measures and the pre-operation module include the execution of setting value verification and adjustment, test wiring, pressure plate activation and deactivation, and safety technical briefing before the implementation of secondary safety measures.

[0025] The system self-test module performs pre-use laboratory self-tests and on-site self-tests without prior knowledge.

[0026] The grounding status detection module detects grounding status by integrating a DC resistance detection module and a DC voltage detection module into the relay protection tester.

[0027] The test lead contact status detection module performs test lead contact status detection, consistency comparison between wiring scheme and debugging task, and comprehensive judgment.

[0028] The critical node identification module inside the device obtains the status of critical nodes related to the test circuit inside the device by communicating with the protection device, and performs hierarchical verification.

[0029] The verification result prompt module adopts a multi-module hierarchical summary and judgment method to summarize and visualize the verification results of each module. It also uses XGBoost-based anomaly cause classification and troubleshooting recommendations to enable commissioning personnel to grasp the overall readiness status of the test wiring circuit before formal power-on.

[0030] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0031] (1) The present invention can automatically determine and prompt the correctness of the test wiring circuit connection. After the debugging personnel complete the wiring, the system automatically detects the grounding status of the test instrument, the plugging status of the test line and the engagement / disengagement position of the relevant pressure plate, and gives a clear conclusion on whether the test circuit is ready.

[0032] (2) The present invention can accurately locate and remind the faulty node in the test wiring circuit. When other problems are detected, such as unreliable grounding connection, test line not being inserted into the corresponding terminal, or function pressure plate or output pressure plate not being engaged or disengaged in accordance with the debugging requirements, the specific abnormal location and abnormal type are indicated to the debugging personnel.

[0033] (3) This invention replaces manual item-by-item inspection with automated readiness verification, improves the verification efficiency and accuracy of the test wiring module, reduces debugging rework caused by wiring errors, and ensures the smooth progress of subsequent power-on testing. Attached Figure Description

[0034] Figure 1 This is a flowchart illustrating the intelligent verification method for relay protection test wiring of the present invention.

[0035] Figure 2 This is the logic block diagram of the system self-test module.

[0036] Figure 3 This is the logic block diagram of the grounding status detection module.

[0037] Figure 4 This is a logic block diagram of the test line contact status detection module.

[0038] Figure 5 This is a logic block diagram of the key node identification module inside the device.

[0039] Figure 6 This is the logic block diagram of the verification result prompt module.

[0040] Figure 7 This is the distance protection logic diagram for the RCS-943 series line protection device. Detailed Implementation

[0041] Please see Figure 1 As shown, this invention proposes an intelligent verification method for relay protection test wiring, applicable to logic verification and debugging scenarios of protection devices in conventional substations, comprising the following steps:

[0042] Step S1. Preparation of secondary safety measures and pre-commissioning operations are routine operations that need to be completed before the logic verification and commissioning of relay protection devices. They include setting verification and adjustment, test wiring, pressure plate activation and deactivation, and safety technical briefing before the implementation of secondary safety measures. The above operations shall be carried out in accordance with the current relay protection and safety production regulations, and will not be elaborated here.

[0043] Step S2. System self-test, which consists of two parts: pre-use laboratory self-test and on-site self-test without external input. Please refer to [link / reference]. Figure 2 As shown, the specific operations include the following:

[0044] 1) Laboratory Self-Test: Completed before connecting the calibration system to the device under test. Connect a portable analog contact module to the current and voltage output terminals of the relay protection tester, which has a built-in reference impedance circuit. After the self-test is initiated, the tester switches to the internal reference circuit and applies a test signal of preset amplitude, synchronously sampling the measured values ​​and comparing them with the reference values ​​to determine whether each output channel and measurement channel is normal; at the same time, a preset current is applied to the analog contact module to verify the tester's load-carrying capacity. After the self-test is passed, the calibration system records and stores the "Laboratory Self-Test Passed" status.

[0045] 2) On-site self-test: Performed after completing the test wiring at the substation site and before formal power-on commissioning. The verification system only performs communication link handshake confirmation and passive detection of the DC resistance of the grounding circuit, and retrieves the "Laboratory self-test qualified" status. If all the above conditions are met, the verification system is determined to be in normal working condition, and subsequent verification procedures are allowed; if any condition is not met, an abnormal prompt is output and subsequent verification is terminated.

[0046] Step S3. Grounding status detection is achieved through the DC resistance detection module and DC voltage detection module integrated within the relay protection tester, eliminating the need for external independent testing equipment. Please refer to [link / reference]. Figure 3 As shown, the specific operations include the following:

[0047] 1) Grounding potential detection: The DC voltage between the grounding terminal and the internal reference ground is measured by a high input impedance voltage acquisition circuit integrated inside the tester; the input impedance of the voltage acquisition circuit is not less than 10MΩ; the absolute value of the measured voltage is compared with the preset voltage safety threshold of 5V. If the measured value is greater than 5V, the grounding potential is determined to be abnormal, the detection is terminated and "Grounding potential abnormal, please check the grounding grid" is output.

[0048] 2) Grounding loop continuity test: After the grounding potential test is qualified, apply a DC detection signal with an open circuit voltage of 5V and a short circuit current of 10mA between the grounding terminal and the internal reference ground, measure the loop current and calculate the grounding loop resistance value according to Ohm's law; compare the grounding loop resistance value with the preset resistance threshold: if R ≤ 0.5Ω, the grounding is determined to be reliable; if 0.5Ω < R ≤ 100Ω, the grounding is determined to be poor, and the output "Grounding resistance is too high, please check the grounding clamp tightness" is output; if R > 100Ω or the loop is open, the grounding is determined to be disconnected, and the output "Grounding loop is disconnected, please check the grounding wire connection" is output.

[0049] 3) Comprehensive judgment: Only when the grounding potential is determined to be normal and the grounding is determined to be reliable, the output "Grounding status is qualified, test can continue" will be output; otherwise, the corresponding abnormal prompt will be output, indicating the abnormality type as abnormal grounding potential, poor grounding or grounding disconnection.

[0050] Step S4. Test lead contact status detection, which includes three parts: test lead contact status detection, consistency comparison between wiring scheme and debugging task, and comprehensive judgment. Please refer to [link / reference]. Figure 4 As shown, the specific operations include the following:

[0051] 1) Test lead contact status detection: Standardized test leads with contact indication function are used. The plug end has a built-in LED indicator. When the plug makes reliable contact with the conductive surface inside the terminal hole of the protection device, the LED lights up. The tester interface is equipped with an optocoupler acquisition module corresponding to each test lead, which converts the LED light signal into a digital level signal. The verification system polls the level of each channel. A high level indicates reliable contact, and a low level indicates no connection or poor contact.

[0052] 2) Comparison of wiring scheme and commissioning task consistency: The verification system has a pre-set wiring scheme for this commissioning task, including the commissioning mode and the list of terminals to be connected; the list of connected terminals obtained from the test line contact status detection is compared with the list of terminals to be connected; when the commissioning mode is single-phase commissioning, if the connected list includes the list of terminals to be connected, it is determined that the requirements are met, and extra connected items are only reminded and not blocked; when the commissioning mode is three-phase commissioning, the connected list must completely cover the list of terminals to be connected, and missing items are determined as abnormal and subsequent verification is blocked.

[0053] 3) Comprehensive judgment: If all test leads are found to be in reliable contact and the wiring scheme is deemed to meet the requirements, output "Test lead connection status is qualified"; otherwise, output the corresponding abnormal prompt, indicating the specific terminal number of poor contact or missing wiring.

[0054] Step S5. Identification of key internal nodes: The status of key internal nodes related to the test circuit is obtained through communication with the protection device, and hierarchical verification is performed. Please refer to [link to relevant documentation]. Figure 5 As shown, the specific operations include the following:

[0055] 1) Establish communication with the protection device and read configuration information: The verification system establishes a communication connection with the protection device through the built-in debugging communication interface of the protection device and adopts the communication protocol supported by the device; reads the current function configuration word, setting zone number, the activation / deactivation status of each function soft and hard pressure plate, the setting status of each control word, and the position information of the local / remote switching handle from the protection device.

[0056] 2) Identify the key nodes required for this debugging task: Based on the pre-set functional requirement list for this debugging task, the verification system filters out the functional hard pressure plate, functional soft pressure plate, related control words, maintenance pressure plate, set value zone number and handle position corresponding to the function of this debugging from the data set obtained by reading the configuration information, and marks them as debugging-related nodes; the remaining nodes are marked as non-debugging-related nodes.

[0057] 3) Critical Node Status Level Verification: For each of the debugging-related nodes, verify whether its status meets the debugging requirements: functional hard pressure plates, functional soft pressure plates, related control words, and maintenance pressure plates must be in the engaged or set state; the setpoint zone number must be consistent with the debugging plan; and the handle must be in the ready position. If any of the above conditions are not met, it is judged as abnormal and subsequent debugging is blocked. For the non-debugging-related nodes, if their status is not zero, only a reminder message is output without blocking the debugging.

[0058] 4) Independent identification and prompting of outlet pressure plate status: The activation / deactivation status of each outlet pressure plate is extracted separately from the data obtained from the configuration information and displayed independently in a visual manner; when the outlet pressure plate is not activated, the corresponding node indicator is dark; when the outlet pressure plate is activated, the corresponding node indicator lights up and outputs the text prompt "You have activated the outlet pressure plate, please pay attention"; the outlet pressure plate status is not included in the debugging blocking judgment logic.

[0059] 5) Comprehensive judgment: When all debugging-related nodes in step 3) meet the requirements, the internal key nodes of the device are judged to be in normal condition, and the subsequent verification module is allowed; otherwise, the specific abnormal node information is output and the subsequent verification is blocked.

[0060] Step S6. Verification Result Prompt: A multi-module hierarchical summary and judgment method is used to summarize and visualize the verification results of each module at each level. Anomaly cause classification and troubleshooting recommendations based on XGBoost are also employed, enabling commissioning personnel to clearly understand the overall readiness status of the test wiring circuit before formal power-on. Please refer to... Figure 6 As shown, the specific operations include the following:

[0061] 1) Receive the verification results of each module: the verification conclusion data of the pre-debugging preparation module, the self-test module, the grounding status detection module, the test line contact status detection module, and the internal key node identification module of the verification system in sequence.

[0062] 2) Classification of verification status for each module: A three-level status classification method is adopted to classify the verification conclusion of each module into the blocking status, the release reminder status, or the pass status; among them, the impact items that do not meet the necessary debugging conditions are classified into the blocking status, those that meet the basic conditions but have redundancy or non-debugging functions that have not been exited are classified into the release reminder status, and those that meet all conditions and have no abnormalities are classified into the pass status.

[0063] 3) Generation of comprehensive conclusions: Traverse the hierarchical states of all modules and generate comprehensive conclusions using blocking priority logic: When any module is in a blocking state, output "There is a problem with the debugging loop, please check" and do not allow debugging; when there is no blocking state, output "Debugging is allowed" and display the reminder information synchronously when there is a release reminder state.

[0064] 4) XGBoost-based anomaly cause classification and troubleshooting recommendations: When the verification conclusion of any step is a blocking state or a release reminder state, the verification system calls the pre-trained XGBoost classification model. The input features of the XGBoost model include the current abnormal module name, anomaly type, device model, debugging function type, wiring scheme characteristics, and recent frequency of similar anomalies; the model outputs a ranking list of the most likely causes of the anomaly and the probability value of each cause. Based on the ranking list of causes, the verification system generates a recommended troubleshooting order and presents it to the debugging personnel to assist in quickly locating the root cause of the anomaly.

[0065] The XGBoost model is only used for cause classification and troubleshooting recommendations after an anomaly occurs; it does not participate in the qualification determination of each module, nor in the generation of comprehensive conclusions. The qualification determination of each module is still completed by preset threshold comparison, set comparison, and logical "AND" deterministic verification logic.

[0066] 5) Visual summary display: The verification status of all modules is displayed in the form of a node diagram on the human-computer interaction interface. Each node is marked with green for pass status, yellow for release reminder status, and red for block status. Debuggers can click on each node to view detailed verification results and specific prompts.

[0067] Application Examples

[0068] like Figure 7 As shown, this embodiment takes the overall testing and commissioning of a 110kV line protection system as an example. The commissioning task is to conduct a complete transmission test of the distance protection system on the 110kV line protection device. The commissioning message must show the tripping of the distance protection stage I and the distance acceleration stage, and the tripping output pressure plate must be engaged. The commissioning personnel bring the relay protection tester with the verification function of this invention to the substation site and perform the following procedures.

[0069] 1) Test wiring circuit setup

[0070] Upon arrival at the site, the commissioning personnel first confirmed that the isolation between the protection device to be commissioned and the operating equipment was complete, and then prepared secondary safety measures. They then confirmed that the testing equipment was in good working order and that the system self-test had been completed via the simulated contact module, with the results stored in the testing equipment.

[0071] The commissioning personnel shall complete the following routine preparatory operations according to the commissioning plan: verify that the current setting zone number and setting content of the protection device are consistent with the commissioning plan; insert the current output line of the tester into the A-phase current terminal, B-phase current terminal, and C-phase current terminal of the protection device respectively; insert the voltage output line of the tester into the A-phase voltage terminal, B-phase voltage terminal, and C-phase voltage terminal of the protection device respectively; reliably connect the grounding wire of the tester to the substation grounding busbar through the grounding clamp; and, according to the commissioning function requirements, engage the distance protection function pressure plate and the maintenance pressure plate, and switch the handle to the home position.

[0072] 2) Verification system started

[0073] After the test wiring circuit is set up, the commissioning personnel start the verification program through the human-machine interface of the tester. The verification system executes the following steps in sequence.

[0074] Step 1: Grounding Status Detection. The verification system first performs a grounding potential detection. The high input impedance voltage acquisition circuit integrated into the tester measures the DC voltage value between the grounding terminal and the internal reference ground. The measured value is 0.3V, which is lower than the preset safety threshold of 5V, indicating that the grounding potential is normal. Next, a grounding loop continuity test is performed. A 5V / 10mA DC detection signal is applied between the grounding terminal and the internal reference ground, the loop current is measured, and the grounding loop resistance is calculated. The measured resistance value is 0.2Ω, which is lower than the acceptable threshold of 0.5Ω, indicating that the grounding is reliable. The verification system outputs "Grounding Status Qualified," and this module node is marked in green as a pass status.

[0075] Step 2: Test lead contact status detection. The verification system polls the optocoupler acquisition module corresponding to each test lead. If the contact levels of all six test leads (A-phase current, B-phase current, C-phase current, A-phase voltage, B-phase voltage, and C-phase voltage) are high, all test leads are considered to have reliable contact. The system then compares the connected terminal list with the preset wiring scheme list: the wiring scheme requires six terminals (three-phase current terminals and three-phase voltage terminals), and the connected list is completely consistent with this, with no missing or redundant terminals. The verification system outputs "Test lead connection status qualified," and the module node is marked in green as passed.

[0076] Step 3: Identification of key internal nodes of the device. The verification system reads the current configuration information of the device through the protection device's debugging communication interface, using the communication protocol supported by the device. The reading results show: distance protection is enabled in the function configuration word; the hard switch for distance protection is enabled; the soft switch for distance protection is enabled; the maintenance switch is enabled; the setting zone number is the zone number required by the debugging plan; and the handle position is local. All the above debugging-related nodes meet the requirements. The soft switch for zero-sequence protection, which is not related to this debugging, is enabled. The verification system determines that this is not a debugging function that has not been deactivated, and this node is marked with a yellow release reminder. The exit switch is currently enabled, and the verification system extracts and outputs a separate prompt: "You have enabled the exit switch, please pay attention," and the exit switch node is displayed in a lit-up manner. This module is judged as passed (yellow reminder item exists).

[0077] Step 4: Verification Result Prompt. The verification system employs a multi-module hierarchical summary judgment method, summarizing the verification results of all modules to the human-machine interface. An example of the human-machine interface would be: Secondary safety measures preparation: Performed (green); Equipment preparation and self-test: Equipment intact (green); Pre-debugging preparation module: Completed (green); Verification system self-test module: Self-test passed (green); Grounding status detection module: Grounding reliable (green); Test lead contact status detection module: Connection qualified (green); Internal key node identification module: Node normal, non-debugging function not exited (yellow); Traversing all modules, no blocking status (red), one release reminder status exists (yellow). Using blocking priority logic, the comprehensive conclusion is output: "Verification passed, prompt item exists, debugging can proceed." The interface also displays the yellow reminder details: "Zero-sequence protection soft pressure plate not exited, can continue."

[0078] It should be noted that after confirming that the prompts do not affect the current distance protection commissioning, the commissioning personnel should press the confirmation button to enter the formal current-carrying test phase, and sequentially complete the protection action verification for distance stage I and distance acceleration stage. Throughout the entire test, the protection device operated correctly, the trip output pressure plate correctly tripped the circuit breaker, and the test results met expectations.

[0079] In summary, this invention, by reusing the inherent debugging communication interface of conventional substation protection devices, achieves intelligent verification of the test wiring of aging equipment without additional hardware modifications, filling a technological gap in the field of automated readiness verification of conventional substation circuits. Verification time is reduced from an average of 15 minutes manually to less than 3 minutes, and accuracy is improved to over 99%. Through non-intrusive passive detection and graded blocking mechanisms, it effectively avoids device damage and power grid operation risks caused by wiring errors, improving the safety level of on-site operations.

Claims

1. A method for intelligent verification of relay protection test wiring, characterized in that, The steps are as follows: Step S1. Preparation of secondary safety measures and pre-debugging operations, including setting value verification and adjustment, test wiring, pressure plate activation and deactivation, and safety technical briefing before the implementation of secondary safety measures; Step S2. System self-test, which is divided into pre-use laboratory self-test and on-site self-test without a source; Step S3. Grounding status detection is achieved through the DC resistance detection module and DC voltage detection module integrated inside the relay protection tester; Step S4. Test lead contact status detection, including test lead contact status detection, consistency comparison between wiring scheme and debugging task, and comprehensive judgment; Step S5. Identification of key nodes inside the device: Obtain the status of key nodes related to the test circuit inside the device by communicating with the protection device, and perform hierarchical verification; Step S6. Verification result prompt: A multi-module hierarchical summary judgment method is adopted to summarize and visualize the verification results of each module at each level. Anomaly cause classification and troubleshooting recommendations based on XGBoost are also adopted to enable the commissioning personnel to grasp the overall readiness status of the test wiring circuit before formal power-on.

2. The intelligent verification method for relay protection test wiring as described in claim 1, characterized in that, Step S2, the system self-test, includes the following operations: 1) Laboratory self-test: Completed before connecting the verification system to the device under test; Connect a portable analog contact module to the current and voltage output terminals of the relay protection tester, which has a built-in reference impedance circuit; After the self-test is started, the tester switches to the internal reference circuit and applies a test signal of preset amplitude, synchronously collects the measured values ​​and compares them with the reference values ​​to determine whether each output channel and measurement channel is normal; At the same time, a preset current is applied to the analog contact module to verify the load-carrying capacity of the tester; After the self-test is qualified, the verification system records and stores the "Laboratory self-test qualified" status; 2) On-site self-test: This is performed after the test wiring is completed at the substation site and before formal power-on commissioning; the verification system only performs communication link handshake confirmation and passive detection of DC resistance of grounding circuit, and retrieves the "Laboratory self-test qualified" status; if all the above conditions are met, the verification system is determined to be in normal working condition and is allowed to enter the subsequent verification procedure; if any condition is not met, an abnormal prompt will be output and the subsequent verification will be terminated.

3. The intelligent verification method for relay protection test wiring as described in claim 2, characterized in that, Step S3, grounding status detection, includes the following operations: 1) Grounding potential detection: The DC voltage between the grounding terminal and the internal reference ground is measured by the high input impedance voltage acquisition circuit integrated inside the tester; the input impedance of the voltage acquisition circuit is not less than 10MΩ; the absolute value of the measured voltage is compared with the preset voltage safety threshold of 5V. If the measured value is greater than 5V, the grounding potential is determined to be abnormal, the detection is terminated and "Grounding potential abnormal, please check the grounding grid" is output. 2) Grounding loop continuity test: After the grounding potential test is qualified, apply a DC test signal with an open circuit voltage of 5V and a short circuit current of 10mA between the grounding terminal and the internal reference ground, measure the loop current and calculate the grounding loop resistance value according to Ohm's law; compare the grounding loop resistance value with the preset resistance threshold: if R ≤ 0.5Ω, the grounding is considered reliable; if 0.5Ω < R ≤ 100Ω, the grounding is considered poor, and the output "Grounding resistance is too high, please check the grounding clamp tightness" is output; if R > 100Ω or the loop is open, the grounding is considered disconnected, and the output "Grounding loop is disconnected, please check the grounding wire connection" is output. 3) Comprehensive judgment: Only when the grounding potential is determined to be normal and the grounding is determined to be reliable, the output "Grounding status is qualified, test can continue" will be output; otherwise, the corresponding abnormal prompt will be output, indicating the abnormality type as abnormal grounding potential, poor grounding or grounding disconnection.

4. The intelligent verification method for relay protection test wiring as described in claim 3, characterized in that, Step S4, testing the contact status of the test line, includes the following operations: 1) Test lead contact status detection: Standardized test leads with contact indication function are used. The plug end has a built-in LED indicator. When the plug makes reliable contact with the conductive surface inside the terminal hole of the protection device, the LED is turned on and illuminates. The tester interface is equipped with an optocoupler acquisition module corresponding to each test line, which converts the LED light emission signal into a digital level signal; the verification system polls the level of each channel, and a high level indicates reliable contact, while a low level indicates no connection or poor contact; 2) Comparison of wiring scheme and commissioning task consistency: The verification system has a pre-set wiring scheme for this commissioning task, including the commissioning mode and the list of terminals to be connected; the list of connected terminals obtained from the test line contact status detection is compared with the list of terminals to be connected; when the commissioning mode is single-phase commissioning, if the connected list includes the list of terminals to be connected, it is determined that the requirements are met, and the extra connected items are only reminded and not blocked. When the debugging mode is three-phase debugging, the list of connected items must completely cover the list of items to be connected. Missing items are judged as abnormal and will block subsequent verification. 3) Comprehensive judgment: If all test leads are found to be in reliable contact and the wiring scheme is deemed to meet the requirements, output "Test lead connection status is qualified"; otherwise, output the corresponding abnormal prompt, indicating the specific terminal number of poor contact or missing wiring.

5. The intelligent verification method for relay protection test wiring as described in claim 4, characterized in that, Step S5, identifying key internal nodes of the device, includes the following operations: 1) Establish communication with the protection device and read configuration information: The verification system establishes a communication connection with the protection device through the built-in debugging communication interface of the protection device and adopts the communication protocol supported by the device; reads the current function configuration word, setting zone number, the activation / deactivation status of each function soft and hard pressure plate, the setting status of each control word, and the position information of the local / remote switching handle from the protection device. 2) Identify the key nodes required for this debugging task: Based on the pre-set functional requirement list for this debugging task, the verification system filters out the functional hard pressure plate, functional soft pressure plate, related control words, maintenance pressure plate, set value zone number and handle position corresponding to the functions of this debugging from the data set obtained by reading the configuration information, and marks them as debugging-related nodes; The remaining nodes are marked as non-debugging related nodes; 3) Critical Node Status Level Verification: For each node related to debugging, verify whether its status meets the debugging requirements: Functional hard pressure board, functional soft pressure board, related control words, and maintenance pressure board must be in the engaged or set state, the set value zone number must be consistent with the debugging plan, and the handle must be in the ready position; if any of the above conditions are not met, it is judged as abnormal and subsequent debugging is blocked; for non-debugging related nodes, if their status is not zero, only output a reminder prompt without blocking the debugging. 4) Independent identification and prompting of outlet pressure plate status: The activation / deactivation status of each outlet pressure plate is extracted separately from the data obtained from the configuration information and displayed independently in a visual manner; when the outlet pressure plate is not activated, the corresponding node indicator is dark; when the outlet pressure plate is activated, the corresponding node indicator lights up and outputs the text prompt "You have activated the outlet pressure plate, please pay attention"; the outlet pressure plate status is not included in the debugging blocking judgment logic. 5) Comprehensive judgment: When all debugging-related nodes in step 3) meet the requirements, the internal key nodes of the device are judged to be in normal condition, and the subsequent verification module is allowed; otherwise, the specific abnormal node information is output and the subsequent verification is blocked.

6. The intelligent verification method for relay protection test wiring as described in claim 5, characterized in that, Step S6's verification result prompt includes the following operations: 1) Receive verification results from each module: Verify the verification conclusions from the following modules in sequence: pre-debugging preparation module, self-test module, grounding status detection module, test lead contact status detection module, and internal key node identification module. 2) Classification of verification status of each module: A three-level status classification method is adopted to classify the verification conclusion of each module into the blocking status, the release reminder status, or the pass status; among them, the impact items that do not meet the necessary debugging conditions are classified into the blocking status, those that meet the basic conditions but have redundancy or non-debugging functions that have not been exited are classified into the release reminder status, and those that meet all conditions and have no abnormalities are classified into the pass status. 3) Generation of comprehensive conclusions: Traverse the hierarchical status of all modules and generate comprehensive conclusions using blocking priority logic: When any module is in a blocking state, output "There is a problem with the debugging loop, please check" and do not allow debugging; when there is no blocking state, output "Debugging is allowed" and display the reminder information synchronously when there is a release reminder state; 4) XGBoost-based anomaly cause classification and troubleshooting recommendations: When the verification conclusion of any step is a blocking state or a release reminder state, the verification system calls the pre-trained XGBoost classification model; the input features of the XGBoost model include the current abnormal module name, anomaly type, device model, debugging function type, wiring scheme characteristics, and recent frequency of similar anomalies; the model outputs a ranking list of the most likely causes corresponding to the anomaly and the probability value of each cause; the verification system generates a recommended troubleshooting order based on the cause ranking list and presents it to the debugging personnel to help quickly locate the root cause of the anomaly; 5) Visual summary display: The verification status of all modules is displayed in the form of a node diagram on the human-computer interaction interface. Each node is marked with green for pass status, yellow for release reminder status, and red for block status. Debuggers can click on each node to view detailed verification results and specific prompts.

7. A verification device for implementing the intelligent verification method for relay protection test wiring as described in claim 1, characterized in that, include: The preparation and debugging of secondary safety measures and the pre-operation module include the execution of setting value verification and adjustment, test wiring, pressure plate activation and deactivation, and safety technical briefing before the implementation of secondary safety measures. The system self-test module performs pre-use laboratory self-tests and on-site self-tests without prior knowledge. The grounding status detection module detects grounding status by integrating a DC resistance detection module and a DC voltage detection module into the relay protection tester. The test lead contact status detection module performs test lead contact status detection, consistency comparison between wiring scheme and debugging task, and comprehensive judgment. The critical node identification module inside the device obtains the status of critical nodes related to the test circuit inside the device by communicating with the protection device, and performs hierarchical verification. The verification result prompt module adopts a multi-module hierarchical summary and judgment method to summarize and visualize the verification results of each module. It also uses XGBoost-based anomaly cause classification and troubleshooting recommendations to enable commissioning personnel to grasp the overall readiness status of the test wiring circuit before formal power-on.

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