A grounding switch protection device and method for a ring main unit

Abstract

The present application provides a protection device and method for the earthing switch of a ring main unit. When the earthing switch in the ring main unit is in the open state, the time-domain fluctuation characteristics of the line current in the ring main unit in the open state are extracted from the power states of each protection line in the ring main unit, and the time-domain fluctuation characteristics are matched with the standard current characteristics to obtain the characteristic matching vector of the line current in the ring main unit, and then the current fault information of the ring main unit when the earthing switch is in the open state is determined; based on the current fault information and the fault locking instruction, the earthing switch is subjected to a locking feedback check to obtain the feedback margin after the earthing switch is locked; if the feedback margin is greater than the preset feedback threshold, the earthing switch sends a locking permission signal to the locking device, and after the locking is completed, the locking device in the earthing switch switches from the working mode to the standby mode. Based on the above scheme, the feedback check of the locking operation in the earthing switch of the ring main unit can be realized, thereby improving the reliability of the locking operation.

Description

Technical Field

[0001] This application relates to the technical field of earthing switches for ring main units. More specifically, this application relates to a protection device and method for an earthing switch of a ring main unit. Background Art

[0002] The earthing switch of the ring main unit has experienced remarkable development from mechanization to intelligence. In the early stage, manual operation was mainly used, with low efficiency and insufficient safety. Later, electromagnetic control was introduced to achieve partial automation, but the ability to prevent misoperation was limited. With the increase in the complexity of the power system, the intelligent earthing switch integrates sensors, microprocessors, and communication modules, realizing real-time monitoring of current, voltage, and fault status, and can automatically complete opening, closing, and locking operations based on preset logic.

[0003] In the actual use of the earthing switch of the ring main unit, the operator may press the wrong button due to unfamiliarity with the operation process or distraction in an emergency, resulting in misoperation. Moreover, the device status indication in the ring main unit may be faulty or unclear, leading the operator to misjudge the switch status and thus execute the wrong instruction. When there is no real-time feedback verification mechanism, the operator cannot promptly discover that the locking operation has not been successful and thus continues to execute the wrong operation, causing system instability or equipment damage. Therefore, how to achieve feedback verification of the locking operation in the earthing switch of the ring main unit to improve the reliability of the locking operation is a difficult problem faced by the industry. Summary of the Invention

[0004] This application provides a protection device and method for an earthing switch of a ring main unit, which can achieve feedback verification of the locking operation in the earthing switch of the ring main unit, thereby improving the reliability of the locking operation.

[0005] In a first aspect, this application provides a locking control method for an earthing switch of a ring main unit, which is used for the protection device of the earthing switch of the ring main unit to perform fault locking control. The method includes the following steps:

[0006] When the earthing switch in the ring main unit is in the open state, the locking device in the earthing switch remains periodically awakened in the standby mode, and monitors the power status of each protection line in the ring main unit when awakened;

[0007] Extract the time-domain fluctuation characteristics of the line current in the ring main unit in the open state from all the power statuses, perform feature matching between the time-domain fluctuation characteristics and the standard current characteristics of the ring main unit to obtain the feature matching vector of the line current in the ring main unit, and then determine the current fault information of the ring main unit when the earthing switch is in the open state according to the feature matching vector and the awakening period of the locking device in the standby mode;

[0008] When the current fault information meets the locking condition of the locking device, the protection device of the ring main unit sends a fault locking instruction to the earthing switch, and the locking device in the earthing switch switches from the standby mode to the working mode. Based on the current fault information and the fault locking instruction, a locking feedback check is performed on the earthing switch to obtain the feedback margin after the earthing switch is locked.

[0009] If the feedback margin is greater than a preset feedback threshold, the earthing switch sends a locking permission signal to the locking device. After locking is completed, the locking device in the earthing switch switches from the working mode to the standby mode.

[0010] In some embodiments, extracting the time-domain fluctuation characteristics of the line current of the ring main unit in the open state from all power states specifically includes:

[0011] For each protected line in the ring main unit, obtain the power state of the protected line;

[0012] Based on the feature learning mechanism, perform feature extraction on the power state to obtain the feature accuracy of the current periodicity in the protected line, and then obtain the feature accuracy of the current periodicity of each protected line in the ring main unit;

[0013] Determine the time-domain fluctuation characteristics of the line current of the ring main unit in the open state according to all the feature accuracies.

[0014] In some embodiments, performing feature matching between the time-domain fluctuation characteristics and the standard current characteristics of the ring main unit to obtain the feature matching vector of the line current in the ring main unit specifically includes:

[0015] Obtain the standard current characteristics of the ring main unit;

[0016] For each protected line in the ring main unit, extract the feature accuracy of the periodicity of the protected line from the time-domain fluctuation characteristics;

[0017] Match the feature accuracy with the standard current characteristics to obtain the current matching degree in the protected line, and then obtain the current matching degree of each protected line in the ring main unit;

[0018] Determine the feature matching vector of the line current in the ring main unit according to all the current matching degrees.

[0019] In some embodiments, determining the current fault information of the ring main unit when the earthing switch is in the open state according to the feature matching vector and the wake-up period of the locking device in the standby mode specifically includes:

[0020] Obtain the wake-up period of the locking device in the standby mode;

[0021] Determine the fault recognition sensitivity of the ring main unit when the earthing switch is in the open state according to the wake-up period;

[0022] Determine the current fault information of the ring main unit when the earthing switch is in the open state based on the recognition sensitivity and the feature matching vector.

[0023] In some embodiments, performing a locking feedback check on the earthing switch based on the current fault information and the fault locking instruction to obtain the feedback margin after locking the earthing switch specifically includes:

[0024] Extract the feedback feature of the earthing switch after locking from the fault locking instruction;

[0025] Determine a feedback check code based on the current fault information and the feedback feature;

[0026] Perform a check on the locking process of the earthing switch based on the feedback check code to obtain the feedback margin after locking the earthing switch.

[0027] In some embodiments, the open state is a state where the earthing switch is disconnected from the ring main unit.

[0028] In some embodiments, the locking device is a mechanical lock with a logic judgment module.

[0029] In a second aspect, the present application provides a protection device for the earthing switch of a ring main unit, including a locking control unit, and the locking control unit includes:

[0030] A monitoring module, configured to keep the locking device in the earthing switch periodically awakened in the standby mode when the earthing switch in the ring main unit is in the open state, and monitor the power states of each protection line in the ring main unit when awakened;

[0031] A processing module, configured to extract the time-domain fluctuation feature of the line current in the ring main unit in the open state from all the power states, perform feature matching between the time-domain fluctuation feature and the standard current feature of the ring main unit to obtain a feature matching vector of the line current in the ring main unit, and further determine the current fault information of the ring main unit when the earthing switch is in the open state according to the feature matching vector and the awakening period of the locking device in the standby mode;

[0032] The processing module is further configured to, when the current fault information meets the locking condition of the locking device, the protection device of the ring main unit sends a fault locking instruction to the earthing switch, the locking device in the earthing switch switches from the standby mode to the working mode, and perform a locking feedback check on the earthing switch based on the current fault information and the fault locking instruction to obtain the feedback margin after locking the earthing switch;

[0033] An execution module, configured to, if the feedback margin is greater than a preset feedback threshold, the earthing switch sends a locking permission signal to the locking device, and after locking is completed, the locking device in the earthing switch switches from the working mode to the standby mode.

[0034] In a third aspect, the present application provides a computer device, which includes a memory and a processor. The memory is used to store a computer program, and the processor is used to call and run the computer program from the memory, so that the computer device executes the above-mentioned locking control method for the earthing switch of the ring main unit.

[0035] In a fourth aspect, the present application provides a computer-readable storage medium, in which instructions or codes are stored. When the instructions or codes run on a computer, the computer is enabled to execute the above-mentioned locking control method for the earthing switch of the ring main unit.

[0036] The technical solutions provided by the disclosed embodiments of the present application have the following beneficial effects:

[0037] In a protection device and method for an earthing switch of a ring main unit provided by the present application, when the earthing switch in the ring main unit is in the open state, the locking device in the earthing switch remains periodically awakened in the standby mode, and monitors the power states of all protection lines in the ring main unit when awakened; extracts the time-domain fluctuation characteristics of the line current in the ring main unit in the open state from all the power states, matches the time-domain fluctuation characteristics with the standard current characteristics of the ring main unit to obtain a characteristic matching vector of the line current in the ring main unit, and then determines the current fault information of the ring main unit when the earthing switch is in the open state according to the characteristic matching vector and the awakening period of the locking device in the standby mode; when the current fault information meets the locking condition of the locking device, the protection device of the ring main unit sends a fault locking instruction to the earthing switch, and the locking device in the earthing switch switches from the standby mode to the working mode, and performs a locking feedback check on the earthing switch based on the current fault information and the fault locking instruction to obtain the feedback margin after the earthing switch is locked; if the feedback margin is greater than a preset feedback threshold, the earthing switch sends a locking permission signal to the locking device, and after the locking is completed, the locking device in the earthing switch switches from the working mode to the standby mode.

[0038] It can be seen that in this application, when the feedback margin is greater than the preset feedback threshold, the earthing switch sends a locking permission signal to the locking device, and after the locking is completed, the locking device in the earthing switch switches from the working mode to the standby mode; First, determining the current fault information can obtain the current fault-related data when the earthing switch is in the open state, which not only helps to detect current faults, but also can evaluate the severity of the faults, providing an accurate decision-making basis for the locking operation. Among them, through feature matching, the ring main unit can extract effective fault signals from complex power states, thus ensuring that the locking operation is carried out under exact fault conditions, avoiding misoperations or delayed locking caused by misjudgment, thereby improving the reliability of the locking operation; Then, determining the feedback margin can obtain the safety margin of the earthing switch after the locking device is locked. This feedback margin can ensure that the implementation of the locking operation is not only necessary but also effective. By calculating the feedback margin, the locking effect can be accurately evaluated, avoiding safety risks of the ring main unit caused by unstable signals or incomplete execution. If the feedback margin is greater than the preset feedback threshold, it indicates that the locking operation can continue. Furthermore, after the locking is completed, the ring main unit switches back to the standby mode, ensuring the efficiency and reliability of the locking operation and further enhancing the safety of the ring main unit; In summary, based on the above solution, the feedback verification of the locking operation of the earthing switch in the ring main unit can be realized, thereby improving the reliability of the locking operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0040] Figure 1 is an exemplary flowchart of a locking control method for an earthing switch of a ring main unit according to some embodiments of the present application;

[0041] Figure 2 is a power supply distribution diagram of a ring main unit according to some embodiments of the present application;

[0042] Figure 3 is a schematic flowchart of determining the feedback margin according to some embodiments of the present application;

[0043] Figure 4 is a schematic structural diagram of a locking control unit according to some embodiments of the present application;

[0044] Figure 5 is a schematic structural diagram of a computer device for implementing a locking control method for an earthing switch of a ring main unit according to some embodiments of the present application. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0045] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative efforts shall fall within the protection scope of the present application.

[0046] To better understand the technical solutions of the present application, the technical solutions of the present application will be described in detail below with reference to the accompanying drawings of the specification and specific implementation manners.

[0047] Referring to Figure 1 , which is an exemplary flowchart of a locking control method for a grounding switch of a ring main unit according to some embodiments of the present application. The locking control method for the grounding switch of the ring main unit mainly includes the following steps:

[0048] In step 101, when the grounding switch in the ring main unit is in the open state, the locking device in the grounding switch remains periodically awakened in the standby mode, and monitors the power states of each protection line in the ring main unit when awakened.

[0049] It should be noted that in the present application, the "open state" means the state where the grounding switch is disconnected from the ring main unit; the standby mode refers to the low-power standby mode in which the locking device is in when the grounding switch is open. The locking device maintains the minimum energy consumption in the standby mode and still has the ability to respond to external signals; the locking device is a mechanical lock with a logic judgment module.

[0050] Specifically, when the grounding switch in the ring main unit is in the open state, the locking device in the grounding switch remains periodically awakened in the standby mode, that is, the locking device in the grounding switch is awakened every fixed interval period (default is 1 minute). For each protection line in the ring main unit, when awakened, the current values of the protection line in the ring main unit at each fixed monitoring interval (default is 1 s) within a specified time period (default is 30 s) are monitored. The set of all current values can be used as the power state of the protection line. In this way, the power states of each protection line in the ring main unit can be obtained.

[0051] In some embodiments, referring to Figure 2As described above, this figure is the power supply distribution diagram of the ring main unit shown in some embodiments of the present application. This figure shows the conversion process from a 110 kV high-voltage transmission line to a 10 kV medium-voltage distribution network. At the top of this figure is the label of 110 kV / 10 kV, indicating that the substation is responsible for reducing the high-voltage power to the medium-voltage level suitable for urban or industrial area power distribution. The substation is the core of the power system. The substation reduces the voltage through a transformer and controls the power flow and ensures the safety of the system through a circuit breaker (indicated by an asterisk ★ in the figure). Starting from the substation, the power is distributed through a cable distribution box (marked with a red box in the figure). The cable distribution box is a key node for power distribution. The cable distribution box allows the power to branch from one main cable to multiple secondary cables, so as to supply power to different areas or loads.

[0052] In the lower part of the power supply distribution diagram of the ring main unit, the ring main unit improves the power supply reliability and flexibility by forming a ring network. The design of the ring main unit allows the power to flow on multiple paths. If a part of the ring main unit fails, the power can be automatically switched to another path, thus reducing the risk of power outage. The ring main unit in this figure is connected to other devices through a circuit breaker. The circuit breaker can control the power flow direction and can cut off the power supply when necessary to protect the system. In addition, a grounding symbol is also shown in the figure, which indicates the safety grounding point of the power system and is used to safely guide the current to the ground in case of a fault, preventing equipment damage and electric shock to personnel. The design of the entire system aims to ensure the efficient distribution of power while providing necessary safety measures to protect power equipment and users.

[0053] In step 102, extract the time-domain fluctuation characteristics of the line current of the ring main unit in the open state from all power states, perform feature matching on the time-domain fluctuation characteristics and the standard current characteristics of the ring main unit to obtain the feature matching vector of the line current in the ring main unit, and then determine the current fault information of the ring main unit when the earthing switch is in the open state according to the feature matching vector and the wake-up period of the locking device in the standby mode.

[0054] In some embodiments, extracting the time-domain fluctuation characteristics of the line current of the ring main unit in the open state from all power states can be achieved by the following steps:

[0055] For each protection line in the ring main unit, obtain the power state of the protection line;

[0056] Based on the feature learning mechanism, perform feature extraction on the power state to obtain the feature accuracy of the current periodicity in the protection line, and then obtain the feature accuracy of the current periodicity of each protection line in the ring main unit;

[0057] Determine the time-domain fluctuation characteristics of the line current of the ring main unit in the open state according to all the feature accuracies.

[0058] It should be noted that in this application, the time-domain fluctuation feature represents the regular fluctuations that repeat over time in the current signal; specifically, in implementation, first, for each protection line in the ring main unit, obtain the power state of the protection line; then, use the feature learning mechanism to extract the difference group between adjacent peaks and valleys among all the current values of the power state as the corresponding amplitude change value, so as to obtain all the amplitude change values. Take the standard deviation of all the current values of the power state as the stability value of the power state, and the ratio of this stability value to the mean of all the amplitude change values can be used as the feature accuracy of the current periodicity in the protection line. Through the above method, the feature accuracy of the current periodicity of each protection line in the ring main unit can be obtained, and this feature accuracy represents the fineness of the time-domain fluctuation feature extraction; finally, the set of all the feature accuracies can be used as the time-domain fluctuation feature of the line current in the ring main unit in the open circuit state.

[0059] In some embodiments, the feature matching of the time-domain fluctuation feature and the standard current feature of the ring main unit to obtain the feature matching vector of the line current in the ring main unit can be implemented by the following steps:

[0060] Obtain the standard current feature of the ring main unit;

[0061] For each protection line in the ring main unit, extract the feature accuracy of the protection line periodicity from the time-domain fluctuation feature;

[0062] Match the feature accuracy and the standard current feature to obtain the current matching degree in the protection line, and then obtain the current matching degrees of each protection line in the ring main unit;

[0063] Determine the feature matching vector of the line current in the ring main unit according to all the current matching degrees.

[0064] It should be noted that in this application, the feature matching vector is a vector used to evaluate the health degree of the ring main unit current state; specifically, in implementation, first, the current signals can be collected by long-term monitoring of the lines of the ring main unit under normal operating conditions, so as to use the time window algorithm to extract the time-domain fluctuation features of all the current signals as the standard current feature. This standard current feature refers to the typical current feature of the power system in the ring main unit under normal working conditions; second, for each protection line in the ring main unit, extract the feature accuracy of the protection line periodicity from the time-domain fluctuation feature; then, the Euclidean distance between the feature accuracy and the standard current feature can be used as the current matching degree in the protection line, and then obtain the current matching degrees of each protection line in the ring main unit. This current matching degree refers to the similarity between the current time-domain fluctuation feature of the protection line and the standard current feature; finally, all the current matching degrees can be vectorized as the feature matching vector of the line current in the ring main unit.

[0065] In some embodiments, determining the current fault information of the ring main unit when the earthing switch is in the open state according to the feature matching vector and the wake-up period of the latching device in the standby mode can be achieved by the following steps:

[0066] Obtain the wake-up period of the latching device in the standby mode;

[0067] Determine the recognition sensitivity of the ring main unit to faults when the earthing switch is in the open state according to the wake-up period;

[0068] Determine the current fault information of the ring main unit when the earthing switch is in the open state through the recognition sensitivity and the feature matching vector.

[0069] It should be noted that in this application, the current fault information refers to the current fault-related data when the earthing switch is in the open state. The current fault information includes the abnormality degree of the current, the fault type, and the fault location. Among them, the abnormality degree is the quantization value of the abnormal degree, the fault type refers to the type of current fault, and the fault type includes short circuit, open circuit, ground fault, etc. The fault location refers to the specific location where the current fault occurs, which can be located through the current distribution and sensor data; the recognition sensitivity refers to the ability of the latching device to recognize current faults. The higher the recognition sensitivity, the faster the ring main unit can recognize the change of the power state.

[0070] When specifically implemented, first, obtain the wake-up period of the latching device in the standby mode; then, the recognition delay of the ring main unit to faults when the earthing switch is in the open state under different wake-up periods can be obtained through a large number of simulation experiments. Obtain all the recognition delays under this wake-up period. The reciprocal of the mean value of all the recognition delays can be used as the recognition sensitivity of the ring main unit to faults when the earthing switch is in the open state. Finally, initialize an anomaly detection model based on Isolation Forest, use the recognition sensitivity as the anomaly score of the Isolation Forest in this anomaly detection model, use all the current matching degrees in the feature matching vector as the basis for constructing random trees in the Isolation Forest, and use this anomaly detection model to perform anomaly evaluation on the current of the ring main unit when the earthing switch is in the open state. The set of the abnormality degree, fault type, and fault location obtained from the anomaly evaluation can be used as the current fault information of the ring main unit when the earthing switch is in the open state.

[0071] It should be noted that a shorter wake-up cycle means that the battery swapping cabinet can monitor the power state of the current in the protection circuit more frequently, so as to capture current fluctuations, faults, and abnormal changes more quickly. Frequent monitoring can improve the fault recognition sensitivity of the ring main unit when the earthing switch is in the open state, enabling the battery swapping cabinet to respond promptly to rapidly changing fault signals; while a longer wake-up cycle usually leads to a decrease in the monitoring frequency of the battery swapping cabinet, resulting in the battery swapping cabinet being able to update its status only at longer time intervals. It may fail to identify rapidly changing faults in a timely manner, thus reducing the sensitivity of fault detection.

[0072] In step 103, when the current fault information meets the locking condition of the locking device, the protection device of the ring main unit sends a fault locking instruction to the earthing switch. The locking device in the earthing switch switches from the standby mode to the working mode, and based on the current fault information and the fault locking instruction, performs a locking feedback check on the earthing switch to obtain the feedback margin after the earthing switch is locked.

[0073] It should be noted that in this application, the fault locking instruction is an operation instruction used to control the earthing switch to enter the locked state. The fault locking instruction carries the abnormality degree, fault type, and fault location; the protection device is a control device in the ring main unit responsible for monitoring the power state and issuing instructions to ensure the safety of the ring main unit; the locking condition of the locking device is the judgment basis for meeting the condition that the fault severity exceeds the safe range. The locking condition of the locking device can be obtained in the central control system of the ring main unit. In other embodiments, in order to ensure the accuracy of locking, the locking condition can also be manually set in combination with historical experience.

[0074] Specifically, when implementing, the abnormality degree, fault type, and fault location in the current fault information are respectively compared with the preset locking conditions. If the current fault information meets the locking condition of the locking device, the protection device of the ring main unit transmits the fault locking instruction to the earthing switch through the communication bus. After the locking device in the earthing switch receives the locking instruction, the locking device activates the main processing unit and switches the control circuit of the locking device from the standby mode to the working mode; where the working mode refers to the state in which the locking device processes the fault signals in the ring main unit. In the working mode, the locking device is fully functional and activated, performing real-time monitoring, verification, and response to complete key tasks such as locking or unlocking.

[0075] In some embodiments, based on the current fault information and the fault locking instruction, a locking feedback check is performed on the earthing switch to obtain the feedback margin after the earthing switch is locked. Refer to Figure 3 As described, this figure is a schematic flowchart for determining the feedback margin in some embodiments of this application. In this embodiment, the feedback margin can be determined by the following steps:

[0076] In step 1031, extract the feedback characteristics of the earthing switch after being locked from the fault locking instruction;

[0077] In step 1032, determine the feedback check code according to the current fault information and the feedback characteristics;

[0078] In step 1033, check the locking process of the earthing switch based on the feedback check code to obtain the feedback margin of the earthing switch after being locked.

[0079] It should be noted that in this application, the feedback characteristics are the characteristics used to describe the working state of the earthing switch after being locked; in specific implementation, extracting the feedback characteristics of the earthing switch after being locked from the fault locking instruction can be achieved by the following steps, that is: a large number of simulation experiments can be used to simulate the current fault scenario, taking the fault locking instruction as the input instruction of the simulation experiment, and counting the feedback abnormality degree, feedback fault type and feedback fault position in each simulation experiment. The set of the feedback abnormality degree, feedback fault type and feedback fault position can be used as the feedback characteristics of the earthing switch after being locked.

[0080] In specific implementation, determining the feedback check code according to the current fault information and the feedback characteristics can be achieved by the following method, that is: extract the feedback characteristics of the earthing switch after being locked from the fault locking instruction; then, take the ratio of the abnormality degree in the current fault information to the feedback abnormality degree in the feedback characteristics as the abnormality difference value, and take the difference value between the fault type in the current fault information and the feedback fault type in the feedback characteristics as the type difference value. That is, if the fault type in the current fault information is the same as the feedback fault type in the feedback characteristics, the difference value is 1, and if the fault type in the current fault information is different from the feedback fault type in the feedback characteristics, the difference value is 0. Take the spatial distance between the fault position in the current fault information and the feedback fault position in the feedback characteristics as the position difference value, and arrange the abnormality difference value, type difference value and position difference value after converting them into binary numbers as the feedback check code; it should be noted that in this application, the feedback check code is a binary check code used to indicate whether the locking process of the earthing switch is effective.

[0081] It should be noted that the feedback margin represents the safety margin of the earthing switch after being locked by the locking device; in specific implementation, checking the locking process of the earthing switch based on the feedback check code to obtain the feedback margin of the earthing switch after being locked can be achieved by the following method, that is: the maximum feedback threshold and the minimum feedback threshold can be preset through historical experience, and the ratio of the value obtained by subtracting the minimum feedback threshold from the feedback check code to the value obtained by subtracting the minimum feedback threshold from the maximum feedback threshold can be used as the check result of the locking process of the earthing switch, and then the check result can be used as the feedback margin of the earthing switch after being locked.

[0082] In step 104, when the feedback margin is greater than a preset feedback threshold, the earthing switch sends a locking permission signal to the locking device. After the locking is completed, the locking device in the earthing switch switches from the working mode to the standby mode.

[0083] It should be noted that in this application, the feedback threshold is the minimum margin value set to judge whether the locking operation is qualified; the locking permission signal is a control signal indicating that the locking device is allowed to perform the locking operation. Specifically, when the feedback margin exceeds the preset feedback threshold, it is determined that the locking operation can effectively solve the existing fault, then the earthing switch sends a locking permission signal to the locking device, the locking device switches the earthing switch to the locked state, and at the same time sends a mode switching instruction to the locking device to turn off the unnecessary function modules and activate the low-power module, that is, the locking device in the earthing switch switches from the working mode to the standby mode.

[0084] In this application, when the feedback margin is greater than the preset feedback threshold, the earthing switch sends a locking permission signal to the locking device. After the locking is completed, the locking device in the earthing switch switches from the working mode to the standby mode. First, determining the current fault information can obtain the current fault-related data when the earthing switch is in the open state, which not only helps to detect the current fault, but also can evaluate the severity of the fault, providing an accurate decision-making basis for the locking operation. Among them, through feature matching, the ring main unit can extract effective fault signals from the complex power state, ensuring that the locking operation is carried out under exact fault conditions, avoiding misoperations or delayed locking caused by misjudgment, thereby improving the reliability of the locking operation. Then, determining the feedback margin can obtain the safety margin of the earthing switch after the locking device locks. This feedback margin can ensure that the implementation of the locking operation is not only necessary but also effective. By calculating the feedback margin, the locking effect can be accurately evaluated, avoiding the safety risks of the ring main unit caused by unstable signals or incomplete execution. If the feedback margin is greater than the preset feedback threshold, it means that the locking operation can continue. Furthermore, after the locking is completed, the ring main unit switches back to the standby mode, ensuring the efficiency and reliability of the locking operation and further improving the safety of the ring main unit. In summary, based on the above solution, the feedback verification of the locking operation in the earthing switch of the ring main unit can be realized, thereby improving the reliability of the locking operation.

[0085] In addition, on the other hand of this application, in some embodiments, this application provides a protection device for the earthing switch of a ring main unit. The protection device for the earthing switch of the ring main unit includes a locking control unit. Refer to Figure 4 , this figure is a schematic structural diagram of the locking control unit shown in some embodiments of this application. The locking control unit includes: a monitoring module 201, a processing module 202, and an execution module 203, which are described as follows:

[0086] Monitoring module 201. In this application, the monitoring module 201 is mainly used to keep the locking device in the grounding switch of the ring main unit in a periodic wake-up state in the standby mode when the grounding switch is in the open state, and monitor the power states of each protection line in the ring main unit when waking up;

[0087] Processing module 202. In this application, the processing module 202 is used to extract the time-domain fluctuation characteristics of the line current of the ring main unit in the open state from all the power states, match the time-domain fluctuation characteristics with the standard current characteristics of the ring main unit to obtain the characteristic matching vector of the line current in the ring main unit, and then determine the current fault information of the ring main unit when the grounding switch is in the open state according to the characteristic matching vector and the wake-up period of the locking device in the standby mode;

[0088] It should be noted that the processing module 202 is also used to, when the current fault information meets the locking condition of the locking device, the protection device of the ring main unit sends a fault locking instruction to the grounding switch, and the locking device in the grounding switch switches from the standby mode to the working mode, and performs a locking feedback check on the grounding switch based on the current fault information and the fault locking instruction to obtain the feedback margin after the grounding switch is locked;

[0089] Execution module 203. In this application, the execution module 203 is mainly used to, if the feedback margin is greater than a preset feedback threshold, the grounding switch sends a locking permission signal to the locking device, and after the locking is completed, the locking device in the grounding switch switches from the working mode to the standby mode.

[0090] The above has introduced in detail the examples of the grounding switch protection device and method for the ring main unit provided by the embodiments of this application. It can be understood that, in order to implement the above functions, the corresponding device includes the corresponding hardware structure and / or software module for executing each function. Those skilled in the art should easily realize that, combining the units and algorithm steps of each example described in the embodiments disclosed in this article, this application can be implemented in the form of hardware or a combination of hardware and computer software. Whether a certain function is executed in the way of hardware or computer software driving hardware depends on the specific application and design constraint conditions of the technical solution. Professional technicians can use different methods to implement the described functions for each specific application, but such implementation should not be considered to exceed the scope of this application.

[0091] In some embodiments, this application also provides a computer device, which includes a memory and a processor. The memory is used to store a computer program, and the processor is used to call and run the computer program from the memory, so that the computer device executes the above-mentioned locking control method for the grounding switch of the ring main unit.

[0092] In some embodiments, refer to Figure 5, the dashed lines in the figure indicate that the unit or module is optional. This figure is a schematic structural diagram of a computer device for implementing the locking control method of the earthing switch of the ring main unit according to an embodiment of the present application. The locking control method of the earthing switch of the ring main unit described in the above embodiment can be implemented by Figure 5 the computer device shown. The computer device includes at least one processor 301, a memory 302, and at least one communication unit 305. The computer device can be a terminal device, a server, or a chip.

[0093] The processor 301 can be a general-purpose processor or a dedicated processor. For example, the processor 301 can be a central processing unit (CPU). The CPU can be used to control the computer device, execute software programs, and process data of software programs. The computer device can also include a communication unit 305 for realizing signal input (reception) and output (transmission).

[0094] For example, the computer device can be a chip, and the communication unit 305 can be the input and / or output circuit of the chip, or the communication unit 305 can be the communication interface of the chip. The chip can be a component of a terminal device, a network device, or other devices.

[0095] Again, for example, the computer device can be a terminal device or a server, and the communication unit 305 can be the transceiver of the terminal device or the server, or the communication unit 305 can be the transceiver circuit of the terminal device or the server.

[0096] The computer device can include one or more memories 302 with a program 304 stored thereon. The program 304 can be run by the processor 301 to generate instructions 303, so that the processor 301 executes the method described in the above method embodiment according to the instructions 303. Optionally, data (such as a target review model) can also be stored in the memory 302. Optionally, the processor 301 can also read the data stored in the memory 302. The data can be stored at the same storage address as the program 304, or the data can be stored at a different storage address from the program 304.

[0097] The processor 301 and the memory 302 can be set separately or integrated together. For example, they can be integrated on a system on chip (SOC) of a terminal device.

[0098] It should be understood that each step of the above method embodiments can be completed by a logic circuit in the form of hardware or an instruction in the form of software in the processor 301. The processor 301 can be a CPU, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA), or other programmable logic devices, such as discrete gates, transistor logic devices, or discrete hardware components.

[0099] Those skilled in the art should understand that the embodiments of the present application can be provided as a method, a system, or a computer program product. Therefore, the present application can take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware aspects. Moreover, the present application can take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0100] For example, in some embodiments, the present application also provides a computer-readable storage medium, in which instructions or codes are stored. When the instructions or codes run on a computer, the computer is caused to execute the above-mentioned locking control method for the earthing switch of the ring main unit.

[0101] Although the preferred embodiments of the present application have been described, those skilled in the art can make additional changes and modifications to these embodiments once they know the basic creative concept. Therefore, the appended claims are intended to be construed to include the preferred embodiments and all changes and modifications falling within the scope of the present application.

[0102] Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalent technologies, the present application is also intended to include these changes and modifications.

Claims

1. A method for controlling the locking of a ring main unit grounding switch, which is used for performing fault locking control on a ring main unit grounding switch protection device, and is characterized in that: The steps include: When the grounding switch in the ring main unit is in the open state, the locking device in the grounding switch keeps waking up periodically in the standby mode, and monitors the power status of each protection line in the ring main unit when waking up; Extract the time domain fluctuation characteristics of the line current of the ring main unit in the open state from all power states, perform feature matching on the time domain fluctuation characteristics and the standard current characteristics of the ring main unit, obtain the feature matching vector of the line current in the ring main unit, and then determine the current fault information of the ring main unit when the grounding switch is in the open state according to the feature matching vector and the wake-up cycle of the locking device in the standby mode; When the current fault information satisfies the locking condition of the locking device, the protection device of the ring main unit sends a fault locking instruction to the grounding switch, the locking device in the grounding switch switches from the standby mode to the working mode, and the grounding switch is subjected to a locking feedback check based on the current fault information and the fault locking instruction to obtain a feedback margin of the grounding switch after locking; If the feedback margin is greater than a preset feedback threshold, the grounding switch sends a locking permission signal to the locking device, and after the locking is completed, the locking device in the grounding switch switches from the working mode to the standby mode; The step of performing a lockout feedback check on the grounding switch based on the current fault information and the fault lockout instruction to obtain the feedback margin of the grounding switch after locking specifically includes: Extracting feedback characteristics of the grounding switch after locking from the fault locking instruction; Determine a feedback check code according to the current fault information and the feedback characteristics; The locking process of the grounding switch is checked based on the feedback check code to obtain the feedback margin of the grounding switch after locking.

2. The method according to claim 1, characterized in that The time domain fluctuation characteristics of the line current in the ring main unit in the off state are extracted from all power states, including: For each protection line in the ring main unit, obtain the power status of the protection line; Extracting features of the power state based on a feature learning mechanism to obtain the feature accuracy of the current periodicity in the protection line, and then obtaining the feature accuracy of the current periodicity of each protection line in the ring network cabinet; The time domain fluctuation characteristics of the line current of the ring main unit in the open state are determined based on the accuracy of all characteristics.

3. The method according to claim 1, characterized in that The time domain fluctuation feature is matched with the standard current feature of the ring main unit to obtain the feature matching vector of the line current in the ring main unit. Specifically, the following steps are performed: Obtain the standard current characteristics of the ring main unit; For each protection line in the ring main unit, extracting the characteristic accuracy of the protection line periodicity from the time domain fluctuation characteristics; Matching the characteristic accuracy with the standard current characteristic to obtain the current matching degree in the protection circuit, and then obtaining the current matching degree of each protection circuit in the ring network cabinet; The characteristic matching vector of the line current in the ring main unit is determined according to all current matching degrees.

4. The method according to claim 1, characterized in that Determining the current fault information of the ring main unit when the grounding switch is in the open state according to the characteristic matching vector and the wake-up cycle of the locking device in the standby mode specifically includes: Get the wake-up cycle of the locking device in standby mode; Determine, according to the wake-up cycle, the fault recognition sensitivity of the ring main unit when the grounding switch is in an open state; The current fault information of the ring main unit when the grounding switch is in an open state is determined by the identification sensitivity and the feature matching vector.

5. The method according to claim 1, characterized in that The open state is a state in which the grounding switch is disconnected from the ring main unit.

6. The method according to claim 1, characterized in that The locking device is a mechanical lock with a logic judgment module.

7. A ring main unit grounding switch protection device, which uses the method according to any one of claims 1 to 6 to perform locking control of the ring main unit grounding switch, the ring main unit grounding switch protection device comprises a locking control unit, characterized in that: The locking control unit comprises: A monitoring module is used to periodically wake up the locking device in the grounding switch in the standby mode when the grounding switch in the ring main unit is in the open state, and monitor the power state of each protection line in the ring main unit when waking up; A processing module, used to extract the time domain fluctuation characteristics of the line current of the ring main unit in the open state from all power states, perform feature matching on the time domain fluctuation characteristics and the standard current characteristics of the ring main unit, obtain the feature matching vector of the line current in the ring main unit, and then determine the current fault information of the ring main unit when the grounding switch is in the open state according to the feature matching vector and the wake-up cycle of the locking device in the standby mode; The processing module is also used for, when the current fault information satisfies the locking condition of the locking device, the protection device of the ring main unit sends a fault locking instruction to the grounding switch, the locking device in the grounding switch switches from the standby mode to the working mode, and the grounding switch is locked based on the current fault information and the fault locking instruction. Feedback verification is performed on the grounding switch to obtain the feedback margin of the grounding switch after locking; The execution module is used for, if the feedback margin is greater than a preset feedback threshold, the grounding switch sends a locking permission signal to the locking device, and after the locking is completed, the locking device in the grounding switch switches from the working mode to the standby mode.

8. A computer device, characterized in that: The computer device includes a memory and a processor, the memory is used to store a computer program, and the processor is used to call and run the computer program from the memory, so that the computer device executes the locking control method of the ring main unit grounding switch according to any one of claims 1 to 6.

9. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores instructions or codes, and when the instructions or codes are executed on a computer, the computer implements the method for locking control of the grounding switch of a ring main unit according to any one of claims 1 to 6.

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