Fault monitoring method for high-voltage cable grounding system

Abstract

The invention relates to the technical field of fault monitoring, in particular to a high-voltage cable grounding system fault monitoring method, which comprises the following steps: collecting grounding data, analyzing the aging condition of a grounding system based on the grounding data, judging the residual aging space of the grounding system reaching a fault critical point based on the aging condition of the grounding system, and collecting construction data. The method comprises the steps of analyzing a construction influence condition based on construction data, judging whether the construction influence is within a bearing range of a grounding system, and giving an alarm for construction causing a fault of the grounding system. By monitoring the grounding system in real time, potential aging or damage problems can be found in time, preventive maintenance can be carried out, whether grounding system faults can be caused or not is judged according to construction data, fault warning is carried out, the fault monitoring precision of the grounding system can be improved, and therefore the stability and safety of the high-voltage cable grounding system are improved.

Description

Technical Field

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

[0002] High-voltage cable grounding fault means that a phase conductor of a high-voltage cable comes into contact with the ground, causing current to flow directly into the ground, thus causing a series of electrical problems. 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, insulation performance degradation, improper construction, etc. Common methods for monitoring faults in high-voltage cable grounding systems are mostly to locate faults through circulating current characteristics, that is, to perform fault monitoring when a fault occurs in the grounding system. However, when there is construction near the grounding system, it is impossible to comprehensively evaluate the impact of the construction and the operation of the grounding system on the fault caused by the construction, resulting in low accuracy in monitoring faults in the high-voltage cable grounding system caused by the construction. For example, a Chinese patent with application publication number CN118330504A discloses a method for monitoring faults in a high-voltage cable grounding system. The method includes the following steps: real-time monitoring of the circulating currents of the grounding boxes at both ends of a single-core cross-connected cable, and comparing it with the circulating currents in the normal state. The collected head-end circulating currents are compared, and when the monitored circulating current is greater than the normal range, the number of fault phases in the grounding system is determined according to the specific phase where the circulating current increases; the target circulating current ratio is calculated according to the number of fault phases; the fault section is judged according to the target circulating current ratio; the actual circulating current ratio is calculated according to the determined number of fault phases and the judged fault section, and then the fault position is located according to the change relationship between the corresponding circulating current ratio and the fault position; wherein the change relationship is obtained by simulation and simulation, and the invention can identify and classify faults according to the grounding system status of the cross-connected cables in operation, and locate the fault by the circulating current characteristics, with high reliability.

[0003] Therefore, technicians in this field are in urgent need of a high-voltage cable grounding system fault monitoring method to solve the current problem of low accuracy in high-voltage cable grounding system fault monitoring caused by construction. Summary of the invention

[0004] The purpose of this application is to provide a method for monitoring faults in a high-voltage cable grounding system. This application determines the remaining aging space for faults based on the aging condition of the grounding system. Real-time monitoring of the grounding system is helpful to timely discover potential aging or damage problems and perform preventive maintenance. It can determine whether a grounding system fault will occur based on construction data and issue a fault alarm, which is helpful to improve the accuracy of grounding system fault monitoring, thereby improving the stability and safety of the high-voltage cable grounding system.

[0005] In order to solve the above technical problems, the present application provides a high-voltage cable grounding system fault monitoring method, comprising the following specific steps: 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; 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.

[0006] Preferably, collecting 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 grounding resistance value; 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.

[0007] Preferably, judging 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.

[0008] Preferably, 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.

[0009] Preferably, the determining whether the construction impact is within the tolerance range of the grounding system and issuing an alarm for the construction causing the grounding system failure comprises 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.

[0010] In order 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 including grounding current, grounding resistance and grounding wire insulation layer temperature distribution, the construction data including 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.

[0011] In order to solve the above technical problems, the present application also provides a high-voltage cable grounding system fault monitoring device, comprising: Memory for storing computer programs; The processor is used to implement the steps of the above-mentioned method for monitoring faults in a high-voltage cable grounding system when executing a computer program.

[0012] In order 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 high-voltage cable grounding system fault monitoring method as described above are implemented.

[0013] The beneficial effects of this application are: This application collects grounding data, analyzes the aging of the grounding system based on the grounding data, determines the remaining aging space of the grounding system to reach the critical point of failure based on the aging 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 issues an alarm for construction that causes grounding system failure. This application determines the remaining aging space for failure based on the aging of the grounding system. Real-time monitoring of the grounding system is conducive to timely discovery of potential aging or damage problems and preventive maintenance. It determines whether the grounding system will fail based on the construction data and issues a fault alarm, which is conducive to improving the accuracy of grounding system fault monitoring, thereby improving the stability and safety of the high-voltage cable grounding system. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0015] Figure 1 A schematic flow chart of a method for monitoring faults in a high-voltage cable grounding system is provided for this application; Figure 2 A schematic diagram of the process of analyzing the aging of the grounding system based on grounding data for this application; Figure 3 A schematic diagram of the process of analyzing the impact of construction based on construction data for this application; Figure 4 This is a schematic diagram of the overall framework of a high-voltage cable grounding system fault monitoring system for this application; Figure 5 The present invention relates to a structural diagram of a high-voltage cable grounding system fault monitoring device. DETAILED DESCRIPTION

[0016] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0017] The core of the present application is to provide a method for monitoring faults in a high-voltage cable grounding system. In order to enable personnel in this technical field to better understand the present application scheme, the present application is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0018] See also Figure 1, an embodiment provided by the present application: a method for monitoring faults in a high-voltage cable grounding system, comprising the following specific steps: Collect grounding data and analyze the aging of the grounding system based on the grounding data; See also Figure 2 In this embodiment, collecting grounding data and analyzing the aging of the grounding system based on the grounding data includes the following specific steps: S11. Collecting grounding data, the grounding data includes grounding current, grounding resistance and grounding wire insulation layer temperature distribution, the grounding wire insulation layer temperature distribution includes hot spot temperature and hot spot distance; In practical applications, a preferred implementation is to use a grounding ammeter to measure the grounding current, or to use a zero-sequence current transformer to measure the zero-sequence current. Zero-sequence current refers to the current generated in a three-phase AC system due to the imbalance of the three-phase current. It is a special fault current that usually occurs when the power system has asymmetry, load imbalance, ground fault or short circuit. Zero-sequence current is the average component of the three-phase current, defined as the current component whose algebraic sum of the three-phase current is zero. The zero-sequence current calculation formula is: , where , and They represent the three-phase current respectively; a ground resistance tester is used to measure the ground resistance, and an infrared thermal imager is used to measure the temperature distribution of the insulation layer of the ground wire, including the temperature size and spacing. The local temperature that is significantly higher than the temperature of the surrounding area is screened out and set as a hot spot, indicating that the insulation layer at the corresponding position of the hot spot may be damaged, internal short circuit, local overload and other problems may occur.

[0019] S12. The grounding current is introduced into the grounding current abnormal value calculation formula to calculate the grounding current abnormal value. 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; specifically, when The larger the value, the more unstable the ground current. The larger the value, the more serious the ground current abnormality.

[0020] 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 grounding resistance value; specifically, when The larger the value, the more unstable the grounding resistance. The larger the value, the more serious the ground resistance abnormality.

[0021] 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; specifically, when The larger the value, the more abnormal the hot spot temperature is. The larger the value, the more abnormal the hotspot spacing.

[0022] In practical applications, a preferred implementation method is: collect several groups of normally operating high-voltage cable grounding systems, obtain 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 hotspot spacings, and take the average values ​​as the standard grounding current value, standard grounding resistance value, standard insulation layer temperature and standard hotspot spacing.

[0023] 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. The calculation formula of ground system aging value is: , where Represents an exponential function with the natural constant e as the base.

[0024] 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; In this embodiment, judging the remaining aging space of the grounding system to reach the critical point of failure based on the aging condition of the grounding system includes the following specific steps: The aging value of the grounding system is imported 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.

[0025] In practical applications, a preferred implementation method is: collect several groups of faulty high-voltage cable grounding systems, obtain historical operation data of the faulty high-voltage cable grounding systems, obtain historical data at the critical point of the fault and analyze the aging critical value of the grounding system, and take the average value of several grounding system aging critical values ​​as the grounding system aging threshold.

[0026] Collect construction data and analyze the impact of construction based on the construction data; See also Figure 3 In this embodiment, collecting construction data and analyzing the construction impact based on the construction data includes the following specific steps: S31. Collect construction data, where the construction data includes construction duration, construction distance, construction vibration frequency, and construction vibration amplitude; In practical applications, a preferred implementation is to use a construction management system or a high-definition camera in the grounding system setting area to monitor the construction start and end time, calculate the construction duration, use a laser rangefinder to measure the construction distance, and use a vibration sensor to measure the construction vibration data.

[0027] S32, importing the construction distance, the construction vibration frequency and the construction vibration amplitude into the construction abnormal value calculation formula to calculate the construction abnormal value, 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; specifically, when The larger the value, the closer the distance between the construction and the grounding system, and the greater the impact of the construction on the grounding system.

[0028] S33, importing the construction duration and the construction abnormal value into the calculation formula of the construction impact aging value to calculate the construction impact aging value, the calculation formula of the construction impact aging value 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.

[0029] In practical applications, a preferred implementation method is: collect several groups of high-voltage cable grounding systems, obtain historical operation data of the high-voltage cable grounding systems, and then obtain historical construction data within a set range of the high-voltage cable grounding systems, obtain the aging rate coefficient by analyzing the changing trends of the historical construction data and the historical operation data of the grounding system, 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.

[0030] 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.

[0031] In this embodiment, 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.

[0032] In the above embodiment, a method for monitoring a high-voltage cable grounding system fault is described in detail. The present application also provides an embodiment corresponding to a system for monitoring a high-voltage cable grounding system fault; See also Figure 4 , a high-voltage cable grounding system fault monitoring system, implemented based on the above-mentioned 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 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.

[0033] The present application also provides an embodiment of a high voltage cable grounding system fault monitoring device. Figure 5 , a high voltage cable grounding system fault monitoring device, comprising: Memory for storing computer programs; The processor is used to implement the steps of a high-voltage cable grounding system fault monitoring method in the above embodiment when executing a computer program.

[0034] Among them, the processor may include one or more processing cores, such as a 4-core processor, an 8-core processor, etc. The processor can be implemented in at least one hardware form of a digital signal processor (Digital Signal Processor, DSP), a field programmable gate array (Field-Programmable Gate Array, FPGA), and a programmable logic array (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 an awake state, also known as a central processing unit (Central Processing Unit, CPU). The coprocessor is a low-power processor for processing data in a standby state. In some embodiments, the processor may also include an artificial intelligence (Artificial Intelligence, AI) processor, which is used to process computing operations related to machine learning.

[0035] 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 memory storage devices. In this embodiment, the memory is at least used to store the following computer program, wherein, after the computer program is loaded and executed by the processor, it can implement the relevant steps of a high-voltage cable grounding system fault monitoring method disclosed in any of the aforementioned embodiments. In addition, the resources stored in the memory may also include an operating system and data, etc. The storage method may be short-term storage or permanent storage, wherein 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.

[0036] The present application also provides an embodiment corresponding to 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 high-voltage cable grounding system fault monitoring method in the above embodiment are implemented.

[0037] It can be understood that if the method in the above-mentioned 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 such an understanding, the technical solution of the present application is essentially or the part that contributes to the prior art or all or part of the technical solution can be embodied in the form of a software product. The computer software product is stored in a storage medium and executes all or part of the steps of the methods of each embodiment of the present application. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (Read-Only Memory, ROM), random access memory (Random Access Memory, RAM), disk or optical disk, etc. Various media that can store program codes.

[0038] The above is a detailed introduction to a high-voltage cable grounding system fault monitoring method provided by the present application. The various embodiments in the specification are described in a progressive manner. Each embodiment focuses on the differences from other embodiments. The same and similar parts between the embodiments can refer 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, and the relevant parts can refer to the method part description. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the present application, several improvements and modifications can be made to the present application, and these improvements and modifications also fall within the scope of protection of the claims of the present application.

[0039] It should also be noted that, in this specification, relational terms such as first and second, etc. are merely 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 terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or apparatus that includes a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or apparatus. In the absence of further restrictions, the elements defined by the sentence "comprises one..." do not exclude the presence of other identical elements in the process, method, article or apparatus that includes the elements.

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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