A method and system for monitoring grounding faults in power cable connections

Abstract

This application relates to the field of cable fault monitoring technology, and in particular to a method and system for monitoring grounding faults in power cable connections. The method includes the following steps: acquiring cable operation data, cable attribute data, and line topology data; determining cable grounding fault points and constructing a set of cable grounding fault points; estimating the fault distance influence factor for each cable grounding fault point; estimating the fault topology influence factor for each cable grounding fault point; estimating the fault current influence factor for each cable grounding fault point; and comprehensively estimating the fault risk of each cable grounding fault point and prioritizing maintenance based on the fault location influence factor, fault topology influence factor, and fault current influence factor. This application, by quantifying the influence of fault distance, fault topology, and fault current, effectively improves the operation and maintenance level and fault response efficiency of power systems by estimating the fault risk of cable grounding fault points and prioritizing maintenance.

Description

Technical Field

[0001] This application relates to the field of cable fault monitoring technology, and in particular to a method and system for monitoring grounding faults in power cable connections. Background Technology

[0002] With the continuous development of power systems and the ever-expanding scale of power grids, the safety and reliability of power cables, as a crucial component of power transmission, are of paramount importance. However, in actual operation, power cables are susceptible to damage from external forces, insulation aging, joint defects, and sheath damage, which can lead to cable grounding faults.

[0003] Cable grounding faults can cause localized overheating and a decline in insulation performance of cables. They are characterized by their insidious and gradual nature, and are often not easily detected in the early stages. However, as time goes on, they can evolve into serious faults such as cable breakdown, phase-to-phase short circuits, and arc erosion, and may even cause the paralysis of the power system, seriously threatening the safety and reliability of the power grid operation.

[0004] Existing cable grounding fault monitoring methods mostly focus on locating the fault point, but lack a comprehensive assessment of the fault's impact range, severity, and risk. The impact of cable grounding faults is not only related to the path distance between the fault point and the power supply side and cable connection nodes, but is also affected by factors such as line topology and current imbalance. Furthermore, the lack of prioritization of fault point maintenance leads to maintenance personnel being unable to address high-risk fault points in a timely manner, thus delaying emergency repairs and even triggering cascading failures. Summary of the Invention

[0005] To overcome the defects and shortcomings of existing technologies, this application provides a method and system for monitoring grounding faults in power cable connections. By quantifying the impact of fault distance, fault topology, and fault current, the system can predict the fault risk of cable grounding fault points and prioritize maintenance, thereby effectively improving fault handling efficiency.

[0006] To achieve the above objectives, this application adopts the following technical solution:

[0007] In a first aspect, this application provides a method for monitoring grounding faults in power cable connections, comprising the following steps:

[0008] Acquire cable operation data, cable attribute data, and line topology data of power cables;

[0009] Based on cable operation data, cable grounding fault location is performed to determine the cable grounding fault point and construct a set of cable grounding fault points.

[0010] Based on the location distribution of cable grounding fault points in the cable line, the fault distance influence factor of each cable grounding fault point is estimated.

[0011] Based on the line topology data, the connection relationship between cables is identified, and the fault topology influence factor of each cable grounding fault point is estimated.

[0012] Based on the analysis of power cable phase sequence asymmetry using cable operation data, the influence factor of fault current at each cable grounding fault point is estimated.

[0013] The fault risk of each cable grounding fault point is estimated by comprehensively considering the fault location influence factor, fault topology influence factor, and fault current influence factor, and the maintenance priority of the fault points is ranked.

[0014] Optionally, the estimated fault distance influence factor for each cable grounding fault point includes:

[0015] Obtain cable attribute data for power cables, including cable length data and cable connection node data;

[0016] The path distance from the cable grounding fault point to the cable power supply side is taken as the first path distance, and the path distance from the cable grounding fault point to the nearest cable connection node is taken as the second path distance.

[0017] The fault distance influence factor for each cable grounding fault point is calculated by combining the first path distance, the second path distance, and cable attribute data. The formula for calculating the fault distance influence factor is as follows:

[0018] ;

[0019] In the formula Indicates the first The first path distance from the cable grounding fault point to the cable power supply side Indicates the first Cable length data corresponding to each cable grounding fault point Indicates the first From the point of cable grounding fault to the nearest cable connection node The second path distance, This indicates the influence weight of the first path distance. , Indicates the first Each cable grounding fault point corresponds to the power supply current on the cable's power source side. This represents the average supply current on the power supply side of all cables. This indicates the weight of the second path distance. , Indicates cable connection node The number of associated cables, This represents the average number of associated cables across all cable connection nodes. Indicates the first The influence factor of fault distance at each cable grounding fault point.

[0020] Optionally, the estimated fault topology influence factor for each cable grounding fault point includes:

[0021] Obtain the line topology data of power cables and construct the line topology diagram;

[0022] The cables corresponding to each cable grounding fault point are taken as fault cables, and the betweenness centrality of the fault cables is calculated through the line topology diagram. The betweenness centrality is the ratio of the number of shortest paths between any two nodes in the line topology diagram that pass through the fault cable to the number of shortest paths between any two nodes in the line topology diagram.

[0023] The ratio of the betweenness centrality of the faulty cable corresponding to the cable grounding fault point to the mean betweenness centrality of all cables in the line topology diagram is used as the fault topology influence factor of the cable grounding fault point. The fault topology influence factor is used to predict the fault influence range of the cable grounding fault.

[0024] Optionally, the estimated fault current influence factor for each cable grounding fault point includes:

[0025] Obtain the three-phase current data of the power cable from the cable operation data;

[0026] The deviation of each single-phase current from the average three-phase current is calculated using the three-phase current data of the cable. The deviation of each single-phase current is the absolute value of the difference between each single-phase current and the average three-phase current.

[0027] The ratio of the maximum single-phase current deviation to the average three-phase current is used as the fault current influence factor of the cable grounding fault point. The fault current influence factor is used to estimate the three-phase current imbalance caused by each cable grounding fault point.

[0028] Optionally, determining the cable grounding fault point and constructing a set of cable grounding fault points includes:

[0029] The cable operation data is acquired and combined with cable grounding fault location methods to locate cable grounding faults in cable lines. These methods include the bridge method, traveling wave method, and time-domain reflection method.

[0030] Based on the cable grounding fault location results, the cable grounding fault point is determined and a cable grounding fault point set containing all cable grounding fault points is constructed for subsequent cable fault risk prediction and fault point maintenance priority ranking.

[0031] Optionally, the step of estimating the fault risk of each cable grounding fault point and prioritizing the maintenance of the fault points includes:

[0032] The fault location influence factor, fault topology influence factor and fault current influence factor of each cable grounding fault point in the set of cable grounding fault points are obtained, and the sum and average value are obtained to obtain the comprehensive fault influence factor of each cable grounding fault point.

[0033] The ratio of the effective value of the current of the cable corresponding to each cable grounding fault point during normal operation to the maximum value of the effective value of the current of all cables is taken as the fault impact intensity.

[0034] The product of the fault impact intensity corresponding to each cable grounding fault point and the comprehensive fault impact factor is taken as the fault risk value of each cable grounding fault point.

[0035] The cable grounding fault points in the set of cable grounding fault points are sorted in descending order according to their corresponding fault risk values ​​to obtain a fault point maintenance priority list.

[0036] Secondly, this application provides a power cable connection grounding fault monitoring system, comprising:

[0037] The data acquisition module is used to acquire cable operation data, cable attribute data, and line topology data of power cables;

[0038] The cable grounding fault location module is used to locate cable grounding faults based on cable operation data, determine the cable grounding fault point, and construct a set of cable grounding fault points.

[0039] The fault distance impact prediction module is used to predict the fault distance impact factor of each cable grounding fault point based on the location distribution of cable grounding fault points in the cable line.

[0040] The fault topology impact prediction module is used to identify the connection relationship between cables based on the line topology data and predict the fault topology impact factor of each cable grounding fault point.

[0041] The fault current impact prediction module is used to analyze the phase sequence asymmetry of power cables based on cable operation data and predict the fault current impact factor of each cable grounding fault point.

[0042] The fault risk prediction module is used to predict the fault risk of each cable grounding fault point by comprehensively considering the fault location influence factor, fault topology influence factor, and fault current influence factor, and to prioritize the maintenance of the fault points.

[0043] Thirdly, this application provides an electronic device, including a processor and a memory, wherein the memory stores a computer program that can be called by the processor, and the processor executes a method for monitoring grounding faults in power cable connections by calling the computer program stored in the memory.

[0044] Fourthly, this application provides a computer-readable storage medium storing instructions that, when executed on a computer, cause the computer to perform a method for monitoring grounding faults in power cable connections.

[0045] Compared with the prior art, this application has the following advantages and beneficial effects:

[0046] This application overcomes the shortcomings of traditional cable grounding fault monitoring technology, which only focuses on fault location and ignores fault impact prediction. By introducing fault location influence factors, fault topology influence factors, and fault current influence factors, it comprehensively characterizes the multi-dimensional impact of cable grounding fault points on power system operation. Then, it prioritizes maintenance based on the fault risk value of cable grounding fault points, which significantly improves fault handling efficiency, reduces the risk of fault expansion, reduces unnecessary power outage time, ensures the safe and stable operation of the power system, and optimizes the allocation of operation and maintenance resources. Attached Figure Description

[0047] Other features, objects, and advantages of this application will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0048] Figure 1 This is a schematic diagram of the overall process of a power cable connection grounding fault monitoring method provided in an embodiment of this application;

[0049] Figure 2 This is a schematic diagram of the principle of the bridge method provided in the embodiments of this application;

[0050] Figure 3 This is a schematic diagram of the structure of a power cable connection grounding fault monitoring system provided in an embodiment of this application;

[0051] Figure 4 This is a schematic diagram of the structure of the electronic device provided in the embodiments of this application. Detailed Implementation

[0052] The technical solution of this application will be described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the embodiments and specific features in the embodiments are detailed descriptions of the technical solution of this application, rather than limitations thereof. In the absence of conflict, the embodiments and technical features in the embodiments can be combined with each other.

[0053] Please see Figure 1 , Figure 1 This is a schematic diagram of the overall process of a power cable connection grounding fault monitoring method provided in an embodiment of this application, which specifically includes the following steps:

[0054] S110: Obtain cable operation data, cable attribute data, and line topology data of power cables.

[0055] S120: Based on cable operation data, locate cable grounding faults, determine the cable grounding fault points, and construct a set of cable grounding fault points;

[0056] Cable grounding fault location based on cable operation data can quickly and accurately identify abnormal locations in cable lines and determine specific grounding fault points after a grounding fault occurs. Furthermore, by constructing a set of cable grounding fault points, it provides data support for subsequent fault impact analysis and fault risk prediction. The process of identifying cable grounding fault points and constructing a set of cable grounding fault points includes:

[0057] Cable grounding fault location is achieved by acquiring cable operation data and combining it with cable grounding fault location methods. These methods include the bridge method, traveling wave method, and time-domain reflection method. Taking the bridge method as an example, the basic principle of the bridge method for cable fault location is as follows: By short-circuiting the non-faulty phase and the faulty phase at the end of the cable under test, a complete closed measurement loop is constructed. By adjusting the variable resistors in the two arms of the bridge, the bridge is brought to a balanced state. When the bridge is balanced, the resistance of each branch satisfies a specific proportional relationship. Since cable resistance is linearly positively correlated with cable length, the distance from the test end to the fault point can be accurately calculated based on the bridge's balance condition and resistance distribution ratio, thus determining the cable grounding fault point. Please refer to [link to relevant documentation]. Figure 2 , Figure 2 This is a schematic diagram of the bridge method provided in the embodiments of this application. The non-faulty phase and the faulty phase at the end of the cable under test are short-circuited. When the cable length is... The distance between the cable grounding fault point and the test end is Based on the bridge balance principle and the proportional relationship between cable resistance and cable length, we can conclude that: , Indicates a known measured resistance. Representing a precision resistance box, the distance between the cable grounding fault point and the test terminal can be obtained by rearranging the data. ;

[0058] Based on the cable grounding fault location results, the cable grounding fault point is determined and a cable grounding fault point set containing all cable grounding fault points is constructed for subsequent cable fault risk prediction and fault point maintenance priority ranking.

[0059] S130: Based on the location distribution of cable grounding fault points in the cable line, estimate the fault distance influence factor of each cable grounding fault point;

[0060] The varying path distances from different cable grounding fault points to the cable power supply side significantly impact the fault current intensity, protection response, and power system operational safety. When the grounding fault point is closer to the power supply side, the path impedance from the power supply side to the grounding fault point is smaller, and the grounding fault current is larger. Conversely, when the grounding fault point is farther from the power supply side, the line impedance increases, the grounding fault current decreases, and the impact is more limited to the end load area. The path distance from the cable grounding fault point to the nearest connection node reflects the proximity of the fault point to critical nodes in the cable network structure. Closer to the connection node, the more easily the grounding fault can spread to adjacent lines or trigger cascading faults at nodes. The estimated fault distance influencing factors for each cable grounding fault point include:

[0061] Obtain cable attribute data for power cables, including cable length data and cable connection node data;

[0062] The path distance from the cable grounding fault point to the cable power supply side is taken as the first path distance, and the path distance from the cable grounding fault point to the nearest cable connection node is taken as the second path distance.

[0063] The fault distance influence factor for each cable grounding fault point is calculated by combining the first path distance, the second path distance, and cable attribute data. The formula for calculating the fault distance influence factor is as follows:

[0064] ;

[0065] In the formula Indicates the first The first path distance from the cable grounding fault point to the cable power supply side Indicates the first Cable length data corresponding to each cable grounding fault point Indicates the first From the point of cable grounding fault to the nearest cable connection node The second path distance, This indicates the influence weight of the first path distance. , Indicates the first The supply current on the power supply side of the cable corresponds to each cable grounding fault point. By introducing the supply current on the power supply side corresponding to the cable fault point as the first path distance influence weight, it is shown that when the supply current on the power supply side is larger, the closer the fault point is to the power supply side, the more significant its impact on the stability of power grid operation will be. This represents the average supply current on all cable power supply sides, used for normalizing the supply current. This indicates the weight of the second path distance. , Indicates cable connection node The number of associated cables increases significantly when a cable grounding fault is near a cable connection node involving multiple associated cables, leading to a wider potential fault propagation path and impact range. This represents the average number of associated cables across all cable connection nodes, used to normalize the number of associated cables. Indicates the first The influence factor of fault distance at each cable grounding fault point.

[0066] S140: Identify the connection relationships between cables based on line topology data and estimate the fault topology influence factor of each cable grounding fault point;

[0067] By constructing a line topology diagram and calculating the betweenness centrality of faulty cables, the criticality of faulty cables in the cable network can be quantified, i.e., the mediating role of faulty cables in the energy transfer process between nodes. Higher betweenness centrality indicates that the cable is on more shortest paths; once a fault occurs, more paths will be blocked, resulting in a larger impact range. The fault topology influence factors for each cable grounding fault point can be estimated, including:

[0068] In one embodiment of this application, the power cable line topology data is obtained and a line topology diagram is constructed. The line topology diagram can be represented as follows: ,in, Representing the line topology diagram The set of nodes in Representing the line topology diagram The cable set in the diagram, each edge in the line topology diagram. Indicates a cable, that is ;

[0069] The cables corresponding to each cable grounding fault point are taken as fault cables, and the betweenness centrality of the fault cables is calculated using the line topology diagram. The betweenness centrality is the ratio of the number of shortest paths between any two nodes in the line topology diagram that pass through the fault cable to the number of shortest paths between any two nodes in the line topology diagram. In one embodiment of this application, the formula for calculating the betweenness centrality of the fault cables can be:

[0070] ;

[0071] In the formula Representing nodes in the line topology diagram To the node The number of shortest paths, where the shortest path represents the connected path with the minimum path length or the fewest hops between any two nodes in the network topology graph. Representing nodes in the line topology diagram To the node The shortest path passes through the first Each cable grounding fault point corresponds to the cable The number of shortest paths, Used to measure cables Importance in cable operating networks This represents the set of nodes in the network topology diagram. Indicates the first Each cable grounding fault point corresponds to the betweenness centrality of the faulty cable;

[0072] The ratio of the betweenness centrality of the faulty cable corresponding to the cable grounding fault point to the mean betweenness centrality of all cables in the line topology diagram is used as the fault topology influence factor of the cable grounding fault point. The fault topology influence factor is used to predict the fault influence range of the cable grounding fault.

[0073] S150: Based on cable operation data analysis, the phase sequence asymmetry of power cables is analyzed, and the fault current influence factor of each cable grounding fault point is estimated.

[0074] Calculating the fault current impact factor can effectively assess the disturbance of grounding faults to the current balance of cable systems. By analyzing three-phase current data and quantifying the degree to which single-phase current deviates from the three-phase average, the current asymmetry caused by the grounding fault can be reflected, thus revealing the electrical impact intensity of the fault point on system operational stability. A higher fault current impact factor indicates that the fault point may lead to a more severe three-phase current imbalance, thereby triggering cascading problems such as equipment overload and protection malfunctions. Therefore, the introduction of the fault current impact factor helps identify fault points with significant electrical impacts and provides a key basis for prioritizing fault point maintenance. The fault current impact factor for each cable grounding fault point is estimated, including:

[0075] Obtain the three-phase current data of the power cable from the cable operation data;

[0076] The deviation of each single-phase current from the average three-phase current is calculated using the three-phase current data of the cable. The deviation of each single-phase current is the absolute value of the difference between each single-phase current and the average three-phase current.

[0077] The ratio of the maximum single-phase current deviation to the average three-phase current is used as the fault current influence factor at the cable grounding fault point. This fault current influence factor is used to estimate the three-phase current imbalance caused by each cable grounding fault point. In one embodiment of this application, the calculation formula for the fault current influence factor can be:

[0078] ;

[0079] In the formula , , They represent the first Three-phase current data of the cable corresponding to each cable grounding fault point. Indicates the first The average three-phase current corresponding to each cable grounding fault point , Indicates the first The influence factor of fault current at each cable grounding fault point.

[0080] S160: Based on the comprehensive fault location influence factor, fault topology influence factor and fault current influence factor, the fault risk of each cable grounding fault point is estimated and the maintenance priority of the fault points is ranked.

[0081] By comprehensively considering the influencing factors of fault location, fault topology, and fault current, the fault risk of each cable grounding fault point is predicted and ranked. This enables a multi-dimensional quantitative assessment of fault point risk, accurately identifying the fault points with the greatest impact on system operation. This allows maintenance personnel to scientifically formulate maintenance plans based on fault risk levels, prioritizing critical risk points and improving the operational reliability and fault response efficiency of the cable system. The method predicts the fault risk of each cable grounding fault point and prioritizes its maintenance, including:

[0082] The fault location influence factor, fault topology influence factor and fault current influence factor of each cable grounding fault point in the set of cable grounding fault points are obtained, and the sum and average value are obtained to obtain the comprehensive fault influence factor of each cable grounding fault point.

[0083] The ratio of the effective value of the current of the cable corresponding to each cable grounding fault point during normal operation to the maximum value of the effective value of the current of all cables is taken as the fault impact intensity.

[0084] The product of the fault impact intensity corresponding to each cable grounding fault point and the comprehensive fault impact factor is taken as the fault risk value of each cable grounding fault point.

[0085] The cable grounding fault points in the set of cable grounding fault points are sorted in descending order according to their corresponding fault risk values ​​to obtain a fault point maintenance priority list.

[0086] Please see Figure 3 , Figure 3 This is a schematic diagram of a power cable connection grounding fault monitoring system provided in an embodiment of this application. The embodiment provides a power cable connection grounding fault monitoring system, including:

[0087] The data acquisition module 210 is used to acquire cable operation data, cable attribute data, and line topology data of power cables;

[0088] The cable grounding fault location module 220 is used to locate cable grounding faults based on cable operation data, determine the cable grounding fault point, and construct a set of cable grounding fault points.

[0089] The fault distance impact prediction module 230 is used to predict the fault distance impact factor of each cable grounding fault point based on the location distribution of the cable grounding fault points in the cable line.

[0090] The fault topology impact prediction module 240 is used to identify the connection relationship between cables based on the line topology data and to predict the fault topology impact factor of each cable grounding fault point.

[0091] The fault current impact prediction module 250 is used to analyze the phase sequence asymmetry of power cables based on cable operation data and predict the fault current impact factor of each cable grounding fault point.

[0092] The fault risk prediction module 260 is used to predict the fault risk of each cable grounding fault point by comprehensively considering the fault location influence factor, fault topology influence factor and fault current influence factor, and to prioritize the maintenance of the fault points.

[0093] In this embodiment, the cable grounding fault location module 220 is used to locate cable grounding faults based on cable operation data, determine the cable grounding fault point, and construct a set of cable grounding fault points, including:

[0094] The cable operation data is acquired and combined with cable grounding fault location methods to locate cable grounding faults in cable lines. These methods include the bridge method, traveling wave method, and time-domain reflection method.

[0095] Based on the cable grounding fault location results, the cable grounding fault point is determined and a cable grounding fault point set containing all cable grounding fault points is constructed for subsequent cable fault risk prediction and fault point maintenance priority ranking.

[0096] In this embodiment, the fault distance impact estimation module 230 is used to estimate the fault distance impact factor of each cable grounding fault point based on the location distribution of the cable grounding fault points in the cable line. The estimation of the fault distance impact factor of each cable grounding fault point includes:

[0097] Obtain cable attribute data for power cables, including cable length data and cable connection node data;

[0098] The path distance from the cable grounding fault point to the cable power supply side is taken as the first path distance, and the path distance from the cable grounding fault point to the nearest cable connection node is taken as the second path distance.

[0099] The fault distance influence factor for each cable grounding fault point is calculated by combining the first path distance, the second path distance, and cable attribute data. The formula for calculating the fault distance influence factor is as follows:

[0100] ;

[0101] In the formula Indicates the first The first path distance from the cable grounding fault point to the cable power supply side Indicates the first Cable length data corresponding to each cable grounding fault point Indicates the first From the point of cable grounding fault to the nearest cable connection node The second path distance, This indicates the influence weight of the first path distance. , Indicates the first Each cable grounding fault point corresponds to the power supply current on the cable's power source side. This represents the average supply current on the power supply side of all cables. This indicates the weight of the second path distance. , Indicates cable connection node The number of associated cables, This represents the average number of associated cables across all cable connection nodes. Indicates the first The influence factor of fault distance at each cable grounding fault point.

[0102] In this embodiment, the fault topology impact prediction module 240 is used to identify the connection relationship between cables based on line topology data, and to predict the fault topology impact factor of each cable grounding fault point. The predicted fault topology impact factor of each cable grounding fault point includes:

[0103] Obtain the line topology data of power cables and construct the line topology diagram. ,in, Representing the line topology diagram The set of nodes in Representing the line topology diagram The cable set in the diagram, each edge in the line topology diagram. Indicates a cable, that is ;

[0104] The cables corresponding to each cable grounding fault point are taken as fault cables, and the betweenness centrality of the fault cables is calculated through the line topology diagram. The betweenness centrality is the ratio of the number of shortest paths between any two nodes in the line topology diagram that pass through the fault cable to the number of shortest paths between any two nodes in the line topology diagram.

[0105] The ratio of the betweenness centrality of the faulty cable corresponding to the cable grounding fault point to the mean betweenness centrality of all cables in the line topology diagram is used as the fault topology influence factor of the cable grounding fault point. The fault topology influence factor is used to predict the fault influence range of the cable grounding fault.

[0106] In this embodiment, the fault current impact prediction module 250 is used to analyze the phase sequence asymmetry of the power cable based on cable operation data, and to predict the fault current impact factor of each cable grounding fault point. The predicted fault current impact factor of each cable grounding fault point includes:

[0107] Obtain the three-phase current data of the power cable from the cable operation data;

[0108] The deviation of each single-phase current from the average three-phase current is calculated using the three-phase current data of the cable. The deviation of each single-phase current is the absolute value of the difference between each single-phase current and the average three-phase current.

[0109] The ratio of the maximum single-phase current deviation to the average three-phase current is used as the fault current influence factor of the cable grounding fault point. The fault current influence factor is used to estimate the three-phase current imbalance caused by each cable grounding fault point.

[0110] In this embodiment, the fault risk prediction module 260 is used to comprehensively predict the fault risk of each cable grounding fault point by combining the fault location influence factor, fault topology influence factor, and fault current influence factor, and to prioritize the maintenance of the fault points. The process of predicting the fault risk of each cable grounding fault point and prioritizing its maintenance includes:

[0111] The fault location influence factor, fault topology influence factor and fault current influence factor of each cable grounding fault point in the set of cable grounding fault points are obtained, and the sum and average value are obtained to obtain the comprehensive fault influence factor of each cable grounding fault point.

[0112] The ratio of the effective value of the current of the cable corresponding to each cable grounding fault point during normal operation to the maximum value of the effective value of the current of all cables is taken as the fault impact intensity.

[0113] The product of the fault impact intensity corresponding to each cable grounding fault point and the comprehensive fault impact factor is taken as the fault risk value of each cable grounding fault point.

[0114] The cable grounding fault points in the set of cable grounding fault points are sorted in descending order according to their corresponding fault risk values ​​to obtain a fault point maintenance priority list.

[0115] The parameters and steps for each unit module to achieve the corresponding functions in the power cable connection grounding fault monitoring system described above can be referred to the parameters and steps in the embodiments of the power cable connection grounding fault monitoring method above, and will not be repeated here.

[0116] Please refer to Figure 4 The present invention also provides an electronic device 300, including a memory 310, a processor 320, and a communication bus 330; the memory 310 and the processor 320 are connected via the communication bus 330. The memory 310 stores a method for monitoring grounding faults in power cable connections, as provided in the above embodiments, which can be loaded and executed by the processor 320.

[0117] The memory 310 can be used to store instructions, programs, code, code sets, or instruction sets. The memory 310 may include a program storage area and a data storage area. The program storage area may store instructions for implementing an operating system, instructions for at least one function, and instructions for implementing the power cable connection grounding fault monitoring method provided in the above embodiments, etc. The data storage area may store data involved in the power cable connection grounding fault monitoring method provided in the above embodiments, etc.

[0118] Processor 320 may include one or more processing cores. Processor 320 executes instructions, programs, code sets, or instruction sets stored in memory 310, and calls data stored in memory 310 to perform various functions and process data as described in this application. Processor 320 may be at least one of the following: Application Specific Integrated Circuit (ASIC), Digital Signal Processor (DSP), Digital Signal Processing Device (DSPD), Programmable Logic Device (PLD), Field Programmable Gate Array (FPGA), Central Processing Unit (CPU), Controller, Microcontroller, and Microprocessor. It is understood that, for different devices, the electronic devices used to implement the functions of processor 320 may also be other types, and this application embodiment does not specifically limit the specific devices used.

[0119] The communication bus 330 may include a path for transmitting information between the aforementioned components. The communication bus 330 may be a PCI (Peripheral Component Interconnect) bus or an EISA (Extended Industry Standard Architecture) bus, etc. The communication bus 330 can be divided into an address bus, a data bus, a control bus, etc. For ease of representation, Figure 4 The symbol is represented by a single double arrow, but this does not mean that there is only one bus or one type of bus.

[0120] This application provides a computer-readable storage medium storing a computer program that can be loaded by a processor and executed as described in the above embodiments, a method for monitoring grounding faults in power cable connections.

[0121] In this embodiment, a computer-readable storage medium can be a tangible device that holds and stores instructions used by an instruction execution device. A computer-readable storage medium can be, but is not limited to, an electrical storage device, a magnetic storage device, an optical storage device, an electromagnetic storage device, a semiconductor storage device, or any combination thereof. Specifically, a computer-readable storage medium can be a portable computer disk, a hard disk, a USB flash drive, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), spoofing random access memory (SRAM), portable compact disc read-only memory (CD-ROM), digital multifunction disc (DVD), memory stick, floppy disk, optical disk, magnetic disk, mechanical encoding device, or any combination thereof.

[0122] The terms “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0123] The above description is merely a preferred embodiment of this application and an explanation of the technical principles employed. Those skilled in the art should understand that the scope of this application is not limited to technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the foregoing application concept. For example, technical solutions formed by substituting the above-described features with (but not limited to) technical features with similar functions claimed in this application.

Claims

1. A method for monitoring grounding faults in power cable connections, characterized in that, include: Acquire cable operation data, cable attribute data, and line topology data of power cables; Based on cable operation data, cable grounding fault location is performed to determine the cable grounding fault point and construct a set of cable grounding fault points; Based on the location distribution of cable grounding fault points in the cable line, the fault distance influence factor of each cable grounding fault point is estimated. Based on the line topology data, the connection relationship between cables is identified, and the fault topology influence factor of each cable grounding fault point is estimated. Based on the analysis of power cable phase sequence asymmetry using cable operation data, the influence factor of fault current at each cable grounding fault point is estimated. The fault risk of each cable grounding fault point is estimated by combining the fault distance influence factor, fault topology influence factor and fault current influence factor, and the maintenance priority of the fault points is ranked. The estimated fault distance influencing factors for each cable grounding fault point include: Obtain cable attribute data for power cables, including cable length data and cable connection node data; The path distance from the cable grounding fault point to the cable power supply side is taken as the first path distance, and the path distance from the cable grounding fault point to the nearest cable connection node is taken as the second path distance. The fault distance influence factor for each cable grounding fault point is calculated by combining the first path distance, the second path distance, and cable attribute data. The formula for calculating the fault distance influence factor is as follows: In the formula, d(i) represents the first path distance from the i-th cable grounding fault point to the cable power supply side, L(i) represents the cable length data corresponding to the i-th cable grounding fault point, d(i,j) represents the second path distance from the i-th cable grounding fault point to the nearest cable connection node j, and α represents the influence weight of the first path distance. I(i) represents the power supply current on the power supply side of the cable corresponding to the i-th cable grounding fault point. F represents the average supply current on all cable power supply sides, β represents the influence weight of the second path distance, β = n(j) / N, n(j) represents the number of associated cables at cable connection node j, N represents the average number of associated cables at all cable connection nodes, and F D (i) represents the fault distance influence factor of the i-th cable grounding fault point; The estimated fault topology influence factors for each cable grounding fault point include: Obtain the line topology data of power cables and construct the line topology diagram; The cables corresponding to each cable grounding fault point are taken as fault cables, and the betweenness centrality of the fault cables is calculated through the line topology diagram. The betweenness centrality is the ratio of the number of shortest paths between any two nodes in the line topology diagram that pass through the fault cable to the number of shortest paths between any two nodes in the line topology diagram. The ratio of the betweenness centrality of the faulty cable corresponding to the cable grounding fault point to the mean betweenness centrality of all cables in the line topology diagram is used as the fault topology influence factor of the cable grounding fault point. The fault topology influence factor is used to estimate the fault influence range of the cable grounding fault. The estimated fault current influence factors for each cable grounding fault point include: Obtain the three-phase current data of the power cable from the cable operation data; The deviation of each single-phase current from the average three-phase current is calculated using the three-phase current data of the cable. The deviation of each single-phase current is the absolute value of the difference between each single-phase current and the average three-phase current. The ratio of the maximum single-phase current deviation to the average three-phase current is used as the fault current influence factor of the cable grounding fault point. The fault current influence factor is used to estimate the three-phase current imbalance caused by each cable grounding fault point.

2. The method for monitoring grounding faults in power cable connections according to claim 1, characterized in that, The process of determining cable grounding fault points and constructing a set of cable grounding fault points includes: The cable operation data is acquired and combined with cable grounding fault location methods to locate cable grounding faults in cable lines. These methods include the bridge method, traveling wave method, and time-domain reflection method. Based on the cable grounding fault location results, the cable grounding fault point is determined and a cable grounding fault point set containing all cable grounding fault points is constructed for subsequent cable fault risk prediction and fault point maintenance priority ranking.

3. The method for monitoring grounding faults in power cable connections according to claim 2, characterized in that, The process of estimating the fault risk of each cable grounding fault point and prioritizing the maintenance of these fault points includes: The fault distance influence factor, fault topology influence factor and fault current influence factor of each cable grounding fault point in the set of cable grounding fault points are obtained, and the sum and average value are obtained to obtain the comprehensive fault influence factor of each cable grounding fault point. The ratio of the effective value of the current of the cable corresponding to each cable grounding fault point during normal operation to the maximum value of the effective value of the current of all cables is taken as the fault impact intensity. The product of the fault impact intensity corresponding to each cable grounding fault point and the comprehensive fault impact factor is taken as the fault risk value of each cable grounding fault point. The cable grounding fault points in the set of cable grounding fault points are sorted in descending order according to their corresponding fault risk values ​​to obtain a fault point maintenance priority list.

4. A power cable connection grounding fault monitoring system, applied to the power cable connection grounding fault monitoring method according to any one of claims 1-3, characterized in that, The system includes: The data acquisition module is used to acquire cable operation data, cable attribute data, and line topology data of power cables; The cable grounding fault location module is used to locate cable grounding faults based on cable operation data, determine the cable grounding fault point, and construct a set of cable grounding fault points. The fault distance impact prediction module is used to predict the fault distance impact factor of each cable grounding fault point based on the location distribution of cable grounding fault points in the cable line. The fault topology impact prediction module is used to identify the connection relationship between cables based on the line topology data and predict the fault topology impact factor of each cable grounding fault point. The fault current impact prediction module is used to analyze the phase sequence asymmetry of power cables based on cable operation data and predict the fault current impact factor of each cable grounding fault point. The fault risk prediction module is used to predict the fault risk of each cable grounding fault point by comprehensively considering the fault distance influence factor, fault topology influence factor, and fault current influence factor, and to prioritize the maintenance of the fault points.

5. An electronic device, comprising: A processor and a memory, wherein the memory stores a computer program that can be called by the processor; characterized in that the processor executes a power cable connection grounding fault monitoring method as described in any one of claims 1-3 by calling the computer program stored in the memory.

6. A computer-readable storage medium, characterized in that, The device stores instructions that, when executed on a computer, cause the computer to perform a power cable connection grounding fault monitoring method as described in any one of claims 1-3.

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