A Fault Monitoring Method for High-Voltage Cable Grounding System

Abstract

This application relates to the technical field of fault monitoring, and particularly to a fault monitoring method for a high-voltage cable grounding system. This application collects grounding data, analyzes the aging condition of the grounding system based on the grounding data, determines the remaining aging space of the grounding system reaching the fault critical point based on the aging condition of the grounding system, collects construction data, analyzes the construction impact situation based on the construction data, determines whether the construction impact is within the tolerance range of the grounding system, and alarms the construction that causes the grounding system fault. This application determines the remaining aging space for generating faults according to the aging condition of the grounding system. Through the real-time monitoring of the grounding system, it is beneficial to timely discover potential aging or damage problems and perform preventive maintenance. Judging whether it will cause a grounding system fault based on the construction data and giving a fault alarm is beneficial to improving the accuracy of grounding system fault monitoring, thereby enhancing the stability and safety of the high-voltage cable grounding system.

Description

Technical Field

[0001] This application relates to the technical field of fault monitoring, and particularly to a method for monitoring faults in a high-voltage cable grounding system. Background Art

[0002] ‌A high-voltage cable grounding fault‌ refers to the contact between a certain phase conductor of a high-voltage cable and the ground, resulting in the direct flow of current into the ground, thereby triggering a series of electrical problems. The grounding fault not only affects the reliability and safety of the power distribution network but may also cause equipment damage or even casualties. The main causes of high-voltage cable grounding faults include‌ external force damage,‌ equipment aging, degradation of insulation performance,‌ improper construction, etc.;

[0003] Common methods for monitoring faults in high-voltage cable grounding systems mostly locate faults through loop current characteristics, that is, fault monitoring is carried out when a fault occurs in the grounding system. However, when there is construction near the grounding system, it is impossible to comprehensively evaluate the fault impact caused by construction considering both the construction situation and the operation situation of the grounding system, resulting in relatively low monitoring accuracy for high-voltage cable grounding system faults caused by construction impacts. For example, in the Chinese patent with the application publication number CN118330504A, a method for monitoring faults in a high-voltage cable grounding system is disclosed. The method includes the following steps: real-time monitoring of the loop current in the grounding boxes at both ends of a single-core cross-connected cable, comparing it with the loop current at the head and end collected under normal conditions. In the case where the monitored loop current is greater than the normal range, determine the number of fault phases of the grounding system according to the specific phase with the increased loop current; calculate the target loop current ratio according to the number of fault phases; judge the fault section according to the target loop current ratio; calculate the actual loop current ratio according to the determined number of fault phases and the judged fault section, and then locate the fault position according to the variation relationship between the corresponding loop current ratio and the fault position; where the variation relationship is obtained through simulation and modeling. This invention can identify and classify faults in the grounding system of an operating cross-connected cable and locate faults through loop current characteristics, with high reliability.

[0004] Therefore, there is an urgent need for those skilled in the art to have a method for monitoring faults in a high-voltage cable grounding system to solve the problem of relatively low monitoring accuracy for high-voltage cable grounding system faults caused by construction impacts. Summary of the Invention

[0005] The purpose of this application is to provide a method for monitoring faults in a high-voltage cable grounding system. This application judges the remaining aging space for faults according to the aging situation of the grounding system. Through real-time monitoring of the grounding system, it is beneficial to timely discover potential aging or damage problems and perform preventive maintenance. Judging whether it will cause a grounding system fault based on construction data and giving a fault warning is beneficial to improving the monitoring accuracy of grounding system faults, thereby enhancing the stability and safety of the high-voltage cable grounding system.

[0006] To solve the above technical problems, the present application provides a method for monitoring faults in a high-voltage cable grounding system, including the following specific steps:

[0007] Collect grounding data and analyze the aging condition of the grounding system based on the grounding data;

[0008] Judge the remaining aging space of the grounding system reaching the fault critical point based on the aging condition of the grounding system;

[0009] Collect construction data and analyze the impact of construction based on the construction data;

[0010] Judge whether the construction impact is within the tolerance range of the grounding system and alarm the construction that causes the grounding system fault.

[0011] Preferably, the step of collecting grounding data and analyzing the aging condition of the grounding system based on the grounding data includes the following specific steps:

[0012] S11. Collect grounding data, where the grounding data includes grounding current, grounding resistance, and the temperature distribution of the insulating layer of the grounding wire, and the temperature distribution of the insulating layer of the grounding wire includes the hot spot temperature and the hot spot spacing;

[0013] S12. Import the grounding current into the grounding current anomaly value calculation formula to calculate the grounding current anomaly value. The grounding current anomaly value calculation formula is: , where represents the number of grounding current acquisitions, represents the j-th grounding current value acquired, represents the average value of the grounding current acquired, represents the standard grounding current value;

[0014] S13. Import the grounding resistance into the grounding resistance anomaly value calculation formula to calculate the grounding resistance anomaly value. The grounding resistance anomaly value calculation formula is: , where represents the number of grounding resistance acquisitions, represents the k-th grounding resistance value acquired, represents the average value of the grounding resistance acquired, represents the standard grounding resistance value;

[0015] S14. Import the hot spot temperature and the hot spot spacing into the insulating layer anomaly value calculation formula to calculate the insulating layer anomaly value. The insulating layer anomaly value calculation formula is: , where represents the number of hot spot temperature acquisitions, represents the i-th hot spot temperature, represents the standard temperature of the insulating layer, Denote the distance between the $i$-th hot spot and the hot spot closest to it. Denote the standard distance between hot spots;

[0016] S15. Import the abnormal value of grounding current, the abnormal value of grounding resistance, and the abnormal value of the insulating layer into the grounding system aging value calculation formula to calculate the grounding system aging value. The grounding system aging value calculation formula is: , where in the formula, Denote the exponential function with the natural constant $e$ as the base.

[0017] Preferably, the remaining aging space for determining that the grounding system reaches the fault critical point based on the grounding system aging condition includes the following specific steps:

[0018] Import the grounding system aging value into the remaining aging value calculation formula to calculate the remaining aging value when the grounding system reaches the fault critical point. The remaining aging value calculation formula is: , where in the formula, Denote the grounding system aging threshold.

[0019] Preferably, the steps of collecting construction data and analyzing the construction influence situation based on the construction data include the following specific steps:

[0020] S31. Collect construction data, where the construction data includes construction duration, construction distance, construction vibration frequency, and construction vibration amplitude;

[0021] S32. Import the construction distance, construction vibration frequency, and construction vibration amplitude into the construction abnormal value calculation formula to calculate the construction abnormal value. The construction abnormal value calculation formula is: , where in the formula, Denote the construction distance, Denote the standard construction distance, Denote the construction data collection duration, Denote the time integral, Denote the construction vibration frequency collected at time $t$, Denote the standard construction vibration frequency, Denote the construction vibration amplitude collected at time $t$, Denote the standard construction vibration amplitude;

[0022] S33. Import the construction duration and the construction abnormal value into the construction influence aging value calculation formula to calculate the construction influence aging value. The construction influence aging value calculation formula is: , where in the formula, Denote the construction start time, Denote the construction end time, Denote the construction duration, Denote the aging rate coefficient, Represents the construction outlier at time t.

[0023] Preferably, determining whether the construction impact is within the tolerance range of the grounding system and alarming the construction that causes the grounding system failure includes the following specific steps:

[0024] Compare the construction impact aging value with the remaining aging value. If the construction impact aging value is less than or equal to the remaining aging value, it is determined that the construction impact is within the tolerance range of the grounding system. If the construction impact aging value is greater than the remaining aging value, it is determined that the construction impact is outside the tolerance range of the grounding system and a fault alarm is issued.

[0025] To solve the above technical problems, the present application also provides a high-voltage cable grounding system fault monitoring system for implementing a high-voltage cable grounding system fault monitoring method, including a data monitoring unit for collecting grounding data and construction data. The grounding data includes grounding current, grounding resistance, and the temperature distribution of the grounding wire insulation layer. The construction data includes construction duration, construction distance, construction vibration frequency, and construction vibration amplitude;

[0026] An aging analysis unit for importing the grounding current into the grounding current outlier calculation formula to calculate the grounding current outlier, importing the grounding resistance into the grounding resistance outlier calculation formula to calculate the grounding resistance outlier, importing the hot spot temperature and hot spot spacing into the insulation layer outlier calculation formula to calculate the insulation layer outlier, and importing the grounding current outlier, grounding resistance outlier, and insulation layer outlier into the grounding system aging value calculation formula to calculate the grounding system aging value;

[0027] A remaining aging space judgment unit for importing the grounding system aging value into the remaining aging value calculation formula to calculate the remaining aging value when the grounding system reaches the fault critical point;

[0028] A construction impact analysis unit for importing the construction distance, construction vibration frequency, and construction vibration amplitude into the construction outlier calculation formula to calculate the construction outlier, and importing the construction duration and construction outlier into the construction impact aging value calculation formula to calculate the construction impact aging value;

[0029] A fault alarm unit for determining whether the construction impact is within the tolerance range of the grounding system and alarming the construction that causes the grounding system failure.

[0030] To solve the above technical problems, the present application also provides a high-voltage cable grounding system fault monitoring device, including:

[0031] A memory for storing computer programs;

[0032] A processor for implementing the steps of a high-voltage cable grounding system fault monitoring method as described above when executing the computer program.

[0033] To solve the above technical problems, the present application also provides a computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, the steps of a method for monitoring faults in a high-voltage cable grounding system as described above are implemented.

[0034] The beneficial effects of the present application are as follows:

[0035] The present application collects grounding data, analyzes the aging condition of the grounding system based on the grounding data, determines the remaining aging space of the grounding system reaching the fault critical point based on the aging condition of the grounding system, collects construction data, analyzes the impact of construction based on the construction data, determines whether the construction impact is within the tolerance range of the grounding system, and alarms the construction that causes faults in the grounding system. The present application determines the remaining aging space for generating faults based on the aging condition of the grounding system. Through real-time monitoring of the grounding system, it is beneficial to timely discover potential aging or damage problems and perform preventive maintenance. Judging whether it will cause faults in the grounding system based on the construction data and giving fault alarms is beneficial to improving the accuracy of fault monitoring of the grounding system, thereby enhancing the stability and safety of the high-voltage cable grounding system. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] To more clearly illustrate the embodiments of the present application, the following will briefly introduce the drawings required in the embodiments. 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 be obtained based on these drawings.

[0037] Figure 1 It is a schematic flow chart of a method for monitoring faults in a high-voltage cable grounding system according to the present application;

[0038] Figure 2 It is a schematic flow chart of analyzing the aging condition of the grounding system based on the grounding data according to the present application;

[0039] Figure 3 It is a schematic flow chart of analyzing the impact of construction based on the construction data according to the present application;

[0040] Figure 4 It is a schematic overall framework diagram of a fault monitoring system for a high-voltage cable grounding system according to the present application;

[0041] Figure 5 It is a structural diagram of a fault monitoring device for a high-voltage cable grounding system according to the present application. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0042] The following will clearly and completely describe the technical solutions in the embodiments of the present application 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 belong to the protection scope of the present application.

[0043] The core of the present application is to provide a method for monitoring faults in a high-voltage cable grounding system. To enable those skilled in the art to better understand the solution of the present application, the following further details the present application in conjunction with the accompanying drawings and specific implementation manners.

[0044] Please refer to Figure 1 , an embodiment provided by the present application: a method for monitoring faults in a high-voltage cable grounding system, which includes the following specific steps:

[0045] Collect grounding data and analyze the aging condition of the grounding system based on the grounding data;

[0046] Please refer to Figure 2 , in this embodiment, collecting grounding data and analyzing the aging condition of the grounding system based on the grounding data includes the following specific steps:

[0047] S11. Collect grounding data, where the grounding data includes grounding current, grounding resistance, and the temperature distribution of the grounding wire insulation layer. The temperature distribution of the grounding wire insulation layer includes the hot spot temperature and the hot spot spacing;

[0048] In practical applications, a preferred implementation method is: measure the grounding current using a grounding ammeter, or measure the zero-sequence current using a zero-sequence current transformer. The zero-sequence current is the current generated due to the imbalance of the three-phase currents in a three-phase alternating current system. It is a special fault current that usually appears when there are asymmetries, load imbalances, grounding faults, or short circuits in the power system. The zero-sequence current is the average component of the three-phase currents and is defined as the current component whose algebraic sum of the three-phase currents is zero. Among them, the zero-sequence current calculation formula is: , where in the formula, , and respectively represent the three-phase currents; measure the grounding resistance using a grounding resistance tester, and measure the temperature distribution of the grounding wire insulation layer using an infrared thermal imager, including the temperature magnitude and the spacing. Screen out the local temperature that is significantly higher than the temperature of the surrounding area and set it as the hot spot, indicating that there may be problems such as damage, internal short circuit, and local overload in the insulation layer at the corresponding position of the hot spot.

[0049] S12. Import the grounding current into the grounding current anomaly value calculation formula to calculate the grounding current anomaly value. The grounding current anomaly value calculation formula is: , where in the formula, Indicates the number of collected grounding currents. Indicates the j-th grounding current value collected. Indicates the average value of the collected grounding currents. Indicates the standard grounding current value; specifically, when The larger the value of, the more unstable the grounding current is. When The larger the value of, the more serious the grounding current anomaly is.

[0050] S13. Import the grounding resistance into the grounding resistance anomaly value calculation formula to calculate the grounding resistance anomaly value. The grounding resistance anomaly value calculation formula is: , where Indicates the number of collected grounding resistances. Indicates the k-th grounding resistance value collected. Indicates the average value of the collected grounding resistances. Indicates the standard grounding resistance value; specifically, when The larger the value of, the more unstable the grounding resistance is. When The larger the value of, the more serious the grounding resistance anomaly is.

[0051] S14. Import the hot spot temperature and hot spot spacing into the insulation layer anomaly value calculation formula to calculate the insulation layer anomaly value. The insulation layer anomaly value calculation formula is: , where Indicates the number of collected hot spot temperatures. Indicates the i-th hot spot temperature. Indicates the standard temperature of the insulation layer. Indicates the spacing between the i-th hot spot and the nearest hot spot. Indicates the standard hot spot spacing; specifically, when The larger the value of, the more abnormal the hot spot temperature is. When The larger the value of, the more abnormal the hot spot spacing is.

[0052] In practical applications, a preferred implementation method is: collect several groups of normally operating high-voltage cable grounding systems, obtain the historical operation data of the high-voltage cable grounding systems, including historical grounding current values, historical grounding resistance values, historical insulation layer temperatures, and historical hot spot spacings, and take the average values as the standard grounding current value, standard grounding resistance value, standard insulation layer temperature, and standard hot spot spacing respectively.

[0053] S15. Import the grounding current anomaly value, grounding resistance anomaly value, and insulation layer anomaly value into the grounding system aging value calculation formula to calculate the grounding system aging value. The grounding system aging value calculation formula is: , where Indicates the exponential function with the natural constant e as the base.

[0054] Judge the remaining aging space of the grounding system reaching the fault critical point based on the aging condition of the grounding system;

[0055] In this embodiment, judging the remaining aging space of the grounding system reaching the fault critical point based on the aging condition of the grounding system includes the following specific steps:

[0056] Import the grounding system aging value into the remaining aging value calculation formula to calculate the remaining aging value when the grounding system reaches the fault critical point. The remaining aging value calculation formula is: , where, represents the grounding system aging threshold.

[0057] In practical applications, a preferred implementation method is: collect several grounding systems of faulty high-voltage cables, obtain the historical operation data of the grounding systems of faulty high-voltage cables, obtain the historical data at the fault critical point and analyze the grounding system aging critical value, and take the average value of several grounding system aging critical values as the grounding system aging threshold.

[0058] Collect construction data and analyze the construction influence situation based on the construction data;

[0059] Please refer to Figure 3 , in this embodiment, collecting construction data and analyzing the construction influence situation based on the construction data includes the following specific steps:

[0060] S31. Collect construction data, where the construction data includes construction duration, construction distance, construction vibration frequency, and construction vibration amplitude;

[0061] In practical applications, a preferred implementation method is: use a construction management system or a high-definition camera in the set area of the grounding system to monitor the start time and end time of construction, calculate the construction duration, use a laser rangefinder to measure the construction distance, and use a vibration sensor to measure the construction vibration data.

[0062] S32. Import the construction distance, construction vibration frequency, and construction vibration amplitude into the construction outlier calculation formula to calculate the construction outlier. The construction outlier calculation formula is: , where, represents the construction distance, represents the standard construction distance, represents the construction data collection duration, represents the time integral, represents the construction vibration frequency collected at time t, represents the standard construction vibration frequency, represents the construction vibration amplitude collected at time t, represents the standard construction vibration amplitude; specifically, when The larger the value, the closer the construction is to the grounding system, and the greater the impact of the construction on the grounding system.

[0063] S33. Import the construction duration and construction outliers into the construction impact aging value calculation formula to calculate the construction impact aging value. The construction impact aging value calculation formula is: , where represents the start time of construction, represents the end time of construction, represents the construction duration, represents the aging rate coefficient, represents the construction outlier at time t.

[0064] In practical applications, a preferred implementation is: collect several groups of high-voltage cable grounding systems, obtain the historical operation data of the high-voltage cable grounding systems, then obtain the historical construction data within the set range of the high-voltage cable grounding systems, obtain the aging rate coefficient by analyzing the change trends of the historical construction data and the historical operation data of the grounding systems, obtain the average construction distance as the standard construction distance through the historical construction data, obtain the average construction vibration frequency as the standard construction vibration frequency, and obtain the average construction vibration amplitude as the standard construction vibration amplitude.

[0065] Judge whether the construction impact is within the tolerance range of the grounding system, and alarm the construction that causes the grounding system failure.

[0066] In this embodiment, judging whether the construction impact is within the tolerance range of the grounding system and alarming the construction that causes the grounding system failure includes the following specific steps:

[0067] Compare the construction impact aging value with the remaining aging value. If the construction impact aging value is less than or equal to the remaining aging value, it is judged that the construction impact is within the tolerance range of the grounding system. If the construction impact aging value is greater than the remaining aging value, it is judged that the construction impact is outside the tolerance range of the grounding system and a fault alarm is issued.

[0068] In the above embodiment, a high-voltage cable grounding system fault monitoring method is described in detail. The present application also provides an embodiment corresponding to a high-voltage cable grounding system fault monitoring system;

[0069] Please refer to Figure 4 , a high-voltage cable grounding system fault monitoring system, implemented based on the above high-voltage cable grounding system fault monitoring method, includes a data monitoring unit for collecting grounding data and construction data. The grounding data includes grounding current, grounding resistance, and grounding wire insulation layer temperature distribution. The construction data includes construction duration, construction distance, construction vibration frequency, and construction vibration amplitude;

[0070] An aging analysis unit is configured to import the grounding current into a grounding current outlier calculation formula to calculate the grounding current outlier, import the grounding resistance into a grounding resistance outlier calculation formula to calculate the grounding resistance outlier, import the hot spot temperature and the hot spot spacing into an insulation layer outlier calculation formula to calculate the insulation layer outlier, and import the grounding current outlier, the grounding resistance outlier and the insulation layer outlier into a grounding system aging value calculation formula to calculate the grounding system aging value;

[0071] A remaining aging space judgment unit is configured to import the grounding system aging value into a remaining aging value calculation formula to calculate the remaining aging value when the grounding system reaches the fault critical point;

[0072] A construction impact analysis unit is configured to import the construction distance, the construction vibration frequency and the construction vibration amplitude into a construction outlier calculation formula to calculate the construction outlier, and import the construction duration and the construction outlier into a construction impact aging value calculation formula to calculate the construction impact aging value;

[0073] A fault warning unit is configured to determine whether the construction impact is within the tolerance range of the grounding system and issue a warning for the construction that causes the grounding system fault.

[0074] This application also provides an embodiment corresponding to a high-voltage cable grounding system fault monitoring device. Please refer to Figure 5 A high-voltage cable grounding system fault monitoring device, comprising:

[0075] A memory for storing a computer program;

[0076] A processor, configured to implement the steps of a high-voltage cable grounding system fault monitoring method in the above embodiment when executing the computer program.

[0077] Wherein, the processor may include one or more processing cores, such as a 4-core processor, an 8-core processor, etc. The processor may be implemented in at least one hardware form of a digital signal processor (DSP), a field-programmable gate array (FPGA), or a programmable logic array (PLA). The processor may also include a main processor and a coprocessor. The main processor is a processor for processing data in the wake state, also known as a central processing unit (CPU). The coprocessor is a low-power processor for processing data in the standby state. In some embodiments, the processor may also include an artificial intelligence (AI) processor for processing computational operations related to machine learning.

[0078] The memory may include one or more computer-readable storage media, which may be non-transitory. The memory may also include high-speed random access memory and non-volatile memory, such as one or more disk storage devices and flash storage devices. In this embodiment, the memory is at least used to store the following computer programs. After the computer programs are loaded and executed by the processor, the relevant steps of a high-voltage cable grounding system fault monitoring method disclosed in any of the foregoing embodiments can be implemented. In addition, the resources stored in the memory may also include an operating system and data, etc. The storage method may be transient storage or permanent storage. Among them, the operating system may include Windows, Unix, Linux, etc., and the data may include, but is not limited to, a high-voltage cable grounding system fault monitoring method, etc.

[0079] This application also provides an embodiment corresponding to a computer-readable storage medium. A computer program is stored on the computer-readable storage medium. When the computer program is executed by the processor, the steps of a high-voltage cable grounding system fault monitoring method in the above embodiment are implemented.

[0080] It can be understood that if the method in the above embodiment is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or all or part of this technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and executes all or part of the steps of the methods in the various embodiments of this application. The foregoing storage medium includes: various media such as USB flash drives, mobile hard disks, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical discs that can store program codes.

[0081] The above has introduced in detail a high-voltage cable grounding system fault monitoring method provided by this application. The various embodiments in the specification are described in a progressive manner. Each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple. For the relevant parts, refer to the description in the method part. It should be noted that for those of ordinary skill in the art in this technical field, without departing from the principle of this application, several improvements and modifications can still be made to this application, and these improvements and modifications also fall within the protection scope of the claims of this application.

[0082] It should also be noted that in this specification, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent in such process, method, article or device. Without further limitation, an element defined by the statement "comprising an..." does not exclude the existence of additional identical elements in the process, method, article or device comprising the element.

Claims

1. A method for monitoring faults in a high-voltage cable grounding system, characterized in that: The specific steps include: Collect grounding data and analyze the aging of the grounding system based on the grounding data; Determine the remaining aging space of the grounding system to reach the critical point of failure based on the aging condition of the grounding system; Collect construction data and analyze the impact of construction based on the construction data; The collecting of construction data and analyzing the construction impact based on the construction data includes the following specific steps: S31, collecting construction data, wherein the construction data includes construction time, construction distance, construction vibration frequency and construction vibration amplitude; S32, importing the construction distance, the construction vibration frequency and the construction vibration amplitude into a construction abnormal value calculation formula to calculate the construction abnormal value, wherein the construction abnormal value calculation formula is: , where Indicates the construction distance, Indicates the standard construction distance, Indicates the construction data collection time. represents the time integral, represents the construction vibration frequency collected at time t, Indicates the standard construction vibration frequency, represents the construction vibration amplitude collected at time t, Indicates the standard construction vibration amplitude; S33, importing the construction duration and the construction abnormal value into the construction impact aging value calculation formula to calculate the construction impact aging value, the construction impact aging value calculation formula is: , where Indicates the construction start time. Indicates the end time of construction. Indicates the construction time. represents the aging rate coefficient, represents the construction anomaly value at time t; Determine whether the construction impact is within the tolerance range of the grounding system and issue an alarm for construction that causes grounding system failure.

2. A method for monitoring faults in a high-voltage cable grounding system according to claim 1, characterized in that: The collecting of grounding data and analyzing the aging of the grounding system based on the grounding data includes the following specific steps: S11, collecting grounding data, wherein the grounding data includes grounding current, grounding resistance and grounding wire insulation layer temperature distribution, wherein the grounding wire insulation layer temperature distribution includes hot spot temperature and hot spot distance; S12, introducing the grounding current into a grounding current abnormal value calculation formula to calculate the grounding current abnormal value, wherein the grounding current abnormal value calculation formula is: , where Indicates the number of ground current samples collected. represents the jth ground current value collected, Represents the average value of the collected ground current, Indicates the standard ground current value; S13, the grounding resistance is introduced into the grounding resistance abnormal value calculation formula to calculate the grounding resistance abnormal value, and the grounding resistance abnormal value calculation formula is: , where Indicates the number of ground resistance samples collected. represents the kth ground resistance value collected, Indicates the average value of the collected ground resistance. Indicates the standard ground resistance value.

3. A method for monitoring faults in a high-voltage cable grounding system according to claim 2, characterized in that: The collecting of grounding data and analyzing the aging of the grounding system based on the grounding data also includes the following specific steps: S14, the hot spot temperature and the hot spot distance are introduced into the insulation layer abnormal value calculation formula to calculate the insulation layer abnormal value, and the insulation layer abnormal value calculation formula is: , where Indicates the number of hotspot temperature samples collected. represents the temperature of the i-th hot spot, Indicates the standard temperature of the insulation layer. represents the distance between the i-th hotspot and its nearest hotspot, Indicates the standard spacing of hot spots; S15, the abnormal value of ground current, the abnormal value of ground resistance and the abnormal value of insulation layer are introduced into the calculation formula of ground system aging value to calculate the aging value of ground system, and the calculation formula of ground system aging value is: , where Represents an exponential function with the natural constant e as the base.

4. A method for monitoring faults in a high-voltage cable grounding system according to claim 3, characterized in that: The method of determining the remaining aging space of the grounding system to reach the critical point of failure based on the aging condition of the grounding system comprises the following specific steps: The aging value of the grounding system is introduced into the residual aging value calculation formula to calculate the residual aging value when the grounding system reaches the critical point of failure. The residual aging value calculation formula is: , where Indicates the grounding system aging threshold.

5. A method for monitoring faults in a high-voltage cable grounding system according to claim 4, characterized in that: The method of judging whether the construction impact is within the tolerance range of the grounding system and issuing an alarm for the construction causing the grounding system fault includes the following specific steps: The construction impact aging value and the residual aging value are compared. If the construction impact aging value is less than or equal to the residual aging value, it is judged that the construction impact is within the tolerance range of the grounding system. If the construction impact aging value is greater than the residual aging value, it is judged that the construction impact is beyond the tolerance range of the grounding system and a fault alarm is issued.

6. A high-voltage cable grounding system fault monitoring system, used to implement a high-voltage cable grounding system fault monitoring method as claimed in any one of claims 1 to 5, characterized in that: It includes a data monitoring unit for collecting grounding data and construction data, wherein the grounding data includes grounding current, grounding resistance and temperature distribution of grounding wire insulation layer, and the construction data includes construction time, construction distance, construction vibration frequency and construction vibration amplitude; An aging analysis unit is used to import the grounding current into a grounding current abnormal value calculation formula to calculate the grounding current abnormal value, import the grounding resistance into a grounding resistance abnormal value calculation formula to calculate the grounding resistance abnormal value, import the hot spot temperature and the hot spot spacing into an insulation layer abnormal value calculation formula to calculate the insulation layer abnormal value, and import the grounding current abnormal value, the grounding resistance abnormal value and the insulation layer abnormal value into a grounding system aging value calculation formula to calculate the grounding system aging value; A remaining aging space judgment unit, used for importing the aging value of the grounding system into the remaining aging value calculation formula to calculate the remaining aging value when the grounding system reaches the critical point of failure; A construction impact analysis unit is used to import the construction distance, construction vibration frequency and construction vibration amplitude into the construction abnormal value calculation formula to calculate the construction abnormal value, and import the construction time and construction abnormal value into the construction impact aging value calculation formula to calculate the construction impact aging value; The fault alarm unit is used to determine whether the construction impact is within the tolerance range of the grounding system and to issue an alarm for construction that causes grounding system faults.

7. A high voltage cable grounding system fault monitoring device, characterized in that: include: Memory for storing computer programs; A processor is used to implement the steps of a high-voltage cable grounding system fault monitoring method as described in any one of claims 1 to 5 when executing the computer program.

8. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a computer program, and when the computer program is executed by the processor, the steps of the high-voltage cable grounding system fault monitoring method according to any one of claims 1 to 5 are implemented.

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