Fault isolation method and device, power distribution network, readable storage medium and chip

Abstract

The invention provides a fault isolation method and device, a power distribution network, a readable storage medium and a chip. The method comprises the steps of obtaining a three-phase current effective value and a threshold value of each protection terminal; determining a protection judgment parameter corresponding to the protection terminal according to an effective value amplitude and a threshold value corresponding to the three-phase current effective value; determining a fault section where a permanent short circuit occurs according to the protection judgment parameter corresponding to each protection terminal; and controlling the protection terminals at the two ends of the fault section to execute isolation protection action. Through the scheme of the invention, efficient transmission of data in the power distribution network can be realized, so that a fault section can be quickly and accurately isolated.

Description

Technical Field

[0001] The present invention relates to the field of power transmission and distribution technology, and in particular to a fault isolation method, device, distribution network, readable storage medium and chip. Background Art

[0002] Traditional differential protection is based on real-time exchange of current values ​​via communication, which can achieve accurate two-end fault isolation. However, the amount of data transmitted is too large, which places high demands on data synchronization accuracy and communication channel transmission capacity. Summary of the invention

[0003] In order to solve or improve the problems of excessive data transmission volume, high requirements on data synchronization accuracy and communication channel transmission capacity in traditional line protection methods, an object of the present invention is to provide a fault isolation method.

[0004] Another object of the present invention is to provide a fault isolation device.

[0005] Another object of the present invention is to provide a power distribution network.

[0006] Another object of the present invention is to provide a power distribution network.

[0007] Another object of the present invention is to provide a readable storage medium.

[0008] Another object of the present invention is to provide a chip.

[0009] To achieve the above-mentioned purpose, the first aspect of the present invention provides a fault isolation method for a distribution network, the distribution network including a distributed power source, a distribution line and a plurality of protection terminals, the fault isolation method including: obtaining the three-phase current effective value and threshold value of each protection terminal; determining the protection judgment parameter corresponding to the protection terminal according to the effective value amplitude and threshold value corresponding to the three-phase current effective value; determining the fault section where a permanent short circuit occurs according to the protection judgment parameter corresponding to each protection terminal; and controlling the protection terminals located at both ends of the fault section to perform isolation protection actions.

[0010] The fault isolation method provided by the present invention is mainly used to timely detect the fault location and isolate the fault section when a permanent short circuit fault occurs in the distribution line. Distributed power sources are small-scale power generation equipment or systems located on the user side or close to the load, such as solar power stations, wind power stations, etc., and unlike centralized power sources (such as thermal power stations, nuclear power stations), distributed power sources are usually distributed at various nodes of the distribution network. These power sources are often directly connected to the distribution lines to provide distributed, smaller-scale power supply. Electricity is transmitted through distribution lines, and protection terminals are used to monitor and protect distribution lines and various power equipment. Protection terminals are distributed in different areas of the distribution network so that protection measures can be taken in the event of a fault, thereby quickly isolating the fault area and preventing the fault from spreading.

[0011] In the case of a permanent short circuit fault in the distribution line, in order to detect the location of the fault, each protection terminal in the line must first be sampled and calculated to obtain the effective value of the three-phase current of each protection terminal, and then the magnitude relationship between the three-phase current effective value amplitude of each protection terminal and the threshold value obtained can be compared to determine whether each protection terminal is located in the upstream section or downstream section of the fault point. Specifically, when a permanent short circuit fault occurs in the distribution line, the current will increase sharply. According to the current distribution characteristics of the power system, the fault current will flow from the power source to the fault point along the distribution line. For the protection terminal located upstream of the fault point, that is, on the power supply side, when a fault occurs, the current will flow from the power supply to the fault point through the protection terminal. At this time, the current increases significantly, and the effective value amplitude of the protection terminal often exceeds the threshold value; for the protection terminal located downstream of the fault point, that is, on the load side, when a fault occurs, there is usually no large amount of current flowing through the line downstream of the fault point, and the effective value amplitude of the protection terminal usually does not exceed the threshold value. In order to clearly and concisely indicate the relative position relationship between each protection terminal and the fault point when a fault occurs, this method generates a comprehensive judgment parameter, namely, the protection judgment parameter, by comparing the effective value amplitude and the threshold value. It can be understood that when each protection terminal transmits the relative position information between itself and the fault point, that is, the current state at the location of the terminal, compared with transmitting the complete three-phase current data, transmitting a single protection judgment parameter can significantly reduce the amount of data and improve the transmission efficiency.

[0012] The protection judgment parameters generated by each protection terminal reflect the current status of its corresponding monitoring area. By analyzing the protection judgment parameters of each protection terminal, the system can determine which terminals have detected currents exceeding the threshold value and which terminals have not. Through further screening, if a pair of adjacent protection terminals are found, one of which detects a current exceeding the threshold value and the other does not exceed the threshold value, it can be determined that the two protection terminals are located at both ends of the fault point, and the section between them is the fault section. The system then controls the two protection terminals to issue instructions to command circuit breakers and other devices to perform tripping operations, thereby effectively isolating the fault section.

[0013] It should be noted that after the distributed power source is connected to the distribution line, the current not only flows from the power source to the load, but there may also be a bidirectional current flow from the load to the power source. The fault isolation method provided by the present invention utilizes the judgment parameters generated by each protection terminal to realize real-time monitoring and direction distinction of current changes, ensuring that faults can still be accurately detected and located under bidirectional current conditions. In addition, the widespread access of distributed power sources will significantly increase the amount of data and communication burden in the distribution line. This method simplifies data transmission, significantly reduces communication bandwidth requirements, and can well adapt to the communication needs in a large-scale distributed power source environment.

[0014] In addition, the above technical solution provided by the present invention may also have the following additional technical features:

[0015] In some technical solutions, optionally, the effective value and threshold value of the three-phase current of each protection terminal are obtained, including: obtaining the maximum load current and the maximum output current; comparing the maximum load current and the maximum output current, and determining the threshold value to be the larger value between the two.

[0016] In this technical solution, in order to determine the threshold value, the maximum load current and the maximum output current must first be obtained. The maximum load current refers to the highest current value that the distribution network needs to carry under maximum load conditions. It reflects the current intensity transmitted by the line during the busiest period or at the peak of load demand. The maximum load current can usually be calculated by the maximum load power and rated voltage of the distribution line. Factors affecting the maximum load current include load type, such as residential or industrial areas connected to the distribution line; and also include seasonal and time factors, such as air conditioning loads in summer will increase the current demand of the distribution network. The maximum output current refers to the highest current value that the distribution network can provide under the most ideal and safe operating conditions. This parameter reflects the maximum current capacity that the distribution line can carry under physical design and equipment limitations. The maximum output current is usually calculated based on the design capacity of the distribution network and the specifications of the distribution line. It can refer to the installed capacity of the distributed power source, or it can be determined by the allowable current density of the distribution line.

[0017] Considering the access of distributed power sources, if the installed capacity is large enough, it may change the magnitude and direction of the current flowing through the protection terminal under normal operation. Therefore, when selecting the threshold value, the method based on the rated current multiple in the traditional overcurrent protection should not be used, but the larger value of the maximum load current and the maximum output current should be taken. It can be understood that after the distributed power source is connected, the direction and magnitude of the current may change with the load. For example, when the load is low and the output of the distributed power source is high, the current may flow from the load end to the centralized power supply end. In this case, the traditional overcurrent protection may be misjudged as a fault, and the selection of a larger threshold value can effectively avoid such false operation. In addition, a higher threshold value can ensure that the protection terminal will not malfunction during normal load fluctuations or distributed power output fluctuations, thereby reducing unnecessary tripping and improving the stability of the system.

[0018] In some technical schemes, optionally, before determining the protection judgment parameters corresponding to the protection terminal according to the effective value amplitude and threshold value corresponding to the effective value of the three-phase current, it also includes: obtaining the current imbalance coefficient and the setting value of each protection terminal; if the current imbalance coefficient is greater than the setting value, executing the step of determining the protection judgment parameters corresponding to the protection terminal according to the size relationship between the effective value amplitude and the threshold value corresponding to the effective value of the three-phase current; if the current imbalance coefficient is less than or equal to the setting value, determining the protection judgment parameters corresponding to the protection terminal.

[0019] In this technical solution, before determining the protection judgment parameters corresponding to the protection terminal, the current unbalance coefficient of each protection terminal must be obtained first. Usually, the grounding method of the distributed power source is a neutral point non-effective grounding method. Under normal operation, there is almost only positive sequence current in the distribution line, and the current unbalance coefficient of each protection terminal is almost 0. Only when a fault occurs, zero sequence and negative sequence current will appear in the line. At this time, the current unbalance coefficient of each protection terminal is relatively large. Therefore, the current unbalance coefficient can be used as a basis for judging whether there is a fault in the distribution line. It can be understood that when the current unbalance coefficient of the protection terminal exceeds a certain threshold, that is, the set value that has been obtained, it can be determined that there is a fault in the line.

[0020] Generally speaking, the setting value is determined in the following way: when the distribution line is in a normal state, the current unbalance coefficient of each protection terminal is sampled to measure the range of the unbalance coefficient under normal conditions; then the unbalance coefficient value during normal fluctuations of the distribution network is counted, and the setting value should be set slightly higher than this value to avoid false triggering of protection due to normal operating fluctuations; in addition, in order to ensure the reliability and stability of the system in actual operation, a certain safety margin is usually added to the setting value to avoid false triggering under normal fluctuations. For example, under normal circumstances, the unbalance coefficient is about 3%, and the setting value can be set to be slightly higher than this value, such as 5%, to exclude the influence of normal fluctuations.

[0021] It can be understood that if the current imbalance coefficient is less than or equal to the set value, it means that the distribution line is operating normally and no fault has occurred. At this time, the protection judgment parameters corresponding to the protection terminal will be directly determined; if the current imbalance coefficient is greater than the set value, it means that there is a fault in the distribution line. At this time, the protection judgment parameters corresponding to the protection terminal will be determined according to the relationship between the effective value amplitude corresponding to the effective value of the three-phase current and the threshold value mentioned in the above scheme.

[0022] In some technical schemes, optionally, the protection judgment parameter corresponding to the protection terminal is determined according to the effective value amplitude and threshold value corresponding to the effective value of the three-phase current, including: if the current imbalance coefficient is less than or equal to the setting value, the protection judgment parameter corresponding to the protection terminal is determined to be the first parameter; if the current imbalance coefficient is greater than the setting value, and the effective value amplitude is greater than the threshold value, the protection judgment parameter corresponding to the protection terminal is determined to be the second parameter; if the current imbalance coefficient is greater than the setting value, and the effective value amplitude is less than or equal to the threshold value, the protection judgment parameter corresponding to the protection terminal is determined to be the third parameter; wherein the second parameter is a fixed positive value, and the third parameter is a fixed negative value with the same absolute value as the second parameter but an opposite sign.

[0023] In this technical solution, before determining the protection judgment parameter, the magnitude relationship between the current unbalance coefficient and the setting value will be compared first. If the current unbalance coefficient is less than or equal to the setting value, it means that the distribution line is operating normally and no fault occurs. Then the protection judgment parameter is directly determined to be the first parameter and set to 0. If the current unbalance coefficient is greater than the setting value, it can be determined that there is a fault in the distribution line at this time, and the relative position relationship between each protection terminal and the fault point needs to be further determined. Under the premise that there is a fault in the line, if the three-phase current effective value amplitude of the protection terminal is greater than the threshold value, it can be determined that the protection terminal is located upstream of the fault point, that is, on the power supply side. At this time, the protection judgment parameter corresponding to the protection terminal is determined to be the second parameter, which is set to a fixed positive value, such as 1, 2 or 3; if the three-phase current effective value amplitude of the protection terminal is less than or equal to the threshold value, it can be determined that the protection terminal is located downstream of the fault point, that is, on the load side. At this time, the protection judgment parameter corresponding to the protection terminal is determined to be the third parameter, which is set to a fixed negative value with the same absolute value as the second parameter but opposite sign, such as -1, -2 or -3.

[0024] In some technical schemes, optionally, according to the protection judgment parameters corresponding to each protection terminal, the fault section where the permanent short circuit occurs is determined, including: determining two adjacent protection terminals as a local terminal and an opposite terminal; determining the parameter difference corresponding to the local terminal according to the protection judgment parameters corresponding to the local terminal and the protection judgment parameters corresponding to the opposite terminal; determining the fault section where the permanent short circuit occurs according to the parameter differences corresponding to multiple local terminals.

[0025] In this technical solution, after determining the protection judgment parameters corresponding to each protection terminal, the system will define the two adjacent protection terminals as the local terminal and the opposite terminal respectively. When the system starts from a certain terminal to judge the fault location or detect the line status, the protection terminal is the local terminal, and the next terminal directly connected to the local terminal is the opposite terminal. Usually, the opposite terminal is located downstream or upstream of the local terminal, and is used to jointly monitor and protect the same line section. In order to accurately locate the fault section, each protection terminal needs to be used as the local terminal, and the parameter difference between the local terminal and the opposite terminal is calculated based on the protection judgment parameters of the local terminal and the opposite terminal. Since the current will suddenly increase in the fault section, this will cause the difference between the protection judgment parameters of the local terminal and the opposite terminal to increase significantly; while in the normal section, this difference is usually small or remains in the normal range. By determining the parameter difference of each pair of adjacent terminals, the section with a significantly prominent difference can be found, and then the section where the permanent short circuit fault occurs can be determined.

[0026] In some technical schemes, optionally, a parameter difference corresponding to the local terminal is determined based on the protection judgment parameters corresponding to the local terminal and the protection judgment parameters corresponding to the opposite terminal, including: determining the parameter difference as the difference obtained by subtracting the protection judgment parameters corresponding to the opposite terminal from the protection judgment parameters corresponding to the local terminal.

[0027] In this technical solution, the difference calculation method of subtracting the protection judgment parameter of the other end from the local end is adopted for each terminal, which can establish a consistent directional standard. The protection system can uniformly analyze the difference of all terminals on the line to avoid confusion caused by different calculation directions. This consistency can ensure that the difference distribution has a clear pattern in the entire line, which facilitates the system to quickly identify abnormal sections.

[0028] In some technical solutions, optionally, controlling the protection terminals located at both ends of the fault section to perform an isolation protection action includes: controlling the protection terminals located at both ends of the fault section to perform a three-phase tripping action of the circuit breaker.

[0029] In this technical solution, after detecting the fault section, the system will control the protection terminals at both ends of the fault section to perform isolation operations to cut off the current in the fault section. Specifically, the system will instruct the circuit breakers of the protection terminals at both ends of the fault section to perform three-phase tripping, that is, disconnect the three-phase current. This tripping action will completely isolate the fault section, separate the power supply of the fault section from the normal section, and prevent the fault impact from spreading to other areas, thereby protecting the safety and stability of the entire distribution network.

[0030] The second aspect of the present invention provides a fault isolation device for use in a distribution network, the distribution network including distributed power sources, distribution lines and multiple protection terminals, the fault isolation device including: an acquisition module for acquiring the effective value and threshold value of the three-phase current of each protection terminal; a parameter determination module for determining the protection judgment parameter corresponding to the protection terminal; a fault location module for determining the fault section where a permanent short circuit occurs; and a control module for controlling the protection terminals located at both ends of the fault section to perform isolation protection actions.

[0031] The third aspect of the present invention provides a distribution network, comprising: the fault isolation device in the above technical solution; a distributed power source for providing power to the distribution network; a distribution line for realizing long-distance transmission of power; and a protection terminal for detecting faults and performing protection actions.

[0032] A fourth aspect of the present invention provides a distribution network, comprising a processor, a memory, and a program or instruction stored in the memory and executable on the processor, wherein when the program or instruction is executed by the processor, the steps of the fault isolation method in any of the above technical solutions are implemented.

[0033] A fifth aspect of the present invention provides a readable storage medium, which stores a computer program. When the computer program is executed by a processor, the steps of the fault isolation method in any of the above technical solutions are implemented.

[0034] A sixth aspect of the present invention provides a chip, which includes a processor and a communication interface, wherein the communication interface and the processor are coupled, and the processor is used to run programs or instructions to implement the steps of the fault isolation method in any of the above technical solutions.

[0035] Additional aspects and advantages of the technical solutions of the present invention will become apparent in the following description or will be understood through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 A schematic diagram of a process flow of a fault isolation method according to an embodiment of the present invention is shown;

[0037] Figure 2 A schematic diagram of a process flow of a fault isolation method according to an embodiment of the present invention is shown;

[0038] Figure 3 A schematic diagram of a process flow of a fault isolation method according to an embodiment of the present invention is shown;

[0039] Figure 4 A schematic diagram of a process flow of a fault isolation method according to an embodiment of the present invention is shown;

[0040] Figure 5A schematic diagram of a process of a fault isolation method according to an embodiment of the present application is shown;

[0041] Figure 6 A schematic diagram of a process of a fault isolation method according to an embodiment of the present application is shown;

[0042] Figure 7 A schematic diagram of the structure of a fault isolation device according to an embodiment of the present invention is shown;

[0043] Figure 8 A schematic diagram of a power distribution network according to an embodiment of the present invention is shown;

[0044] Fig. 9 A schematic diagram of a power distribution network according to an embodiment of the present invention is shown;

[0045] in, Figures 7 to 9 The corresponding relationship between the reference numerals and the component names is as follows:

[0046] 1000: distribution network; 1109: memory; 1110: processor; 900: fault isolation device; 901: acquisition module; 902: parameter determination module; 903: fault location module; 904: control module; 600: centralized power supply; 700: distribution network; 701: protection terminal; 801: load; L0: trunk line; L1: distribution line; DG: distributed power supply; F: permanent short circuit fault. DETAILED DESCRIPTION

[0047] In order to more clearly understand the above-mentioned purposes, features and advantages of the embodiments of the present invention, the embodiments of the present invention are further described in detail below in conjunction with the accompanying drawings and specific implementation methods. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0048] In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the embodiments of the present invention may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present application is not limited to the specific embodiments disclosed below.

[0049] Refer to the following Figures 1 to 9 The present invention describes a fault isolation method, a fault isolation device, a power distribution network, a readable storage medium, and a chip provided according to some embodiments of the present invention.

[0050] This embodiment provides a fault isolation method, such as Figure 1As shown, for a sweeping robot, the fault isolation method includes: step S102: obtaining the three-phase current effective value and threshold value of each protection terminal; step S104: determining the protection judgment parameter corresponding to the protection terminal according to the effective value amplitude and threshold value corresponding to the three-phase current effective value; step S106: determining the fault section where a permanent short circuit occurs according to the protection judgment parameter corresponding to each protection terminal; step S108: controlling the protection terminals located at both ends of the fault section to perform isolation protection actions.

[0051] The fault isolation method provided by the present invention is mainly used to timely detect the fault location and isolate the fault section when a permanent short circuit fault occurs in the distribution line. Distributed power sources are small-scale power generation equipment or systems located on the user side or close to the load, such as solar power stations, wind power stations, etc., and unlike centralized power sources (such as thermal power stations, nuclear power stations), distributed power sources are usually distributed at various nodes of the distribution network. These power sources are often directly connected to the distribution lines to provide distributed, smaller-scale power supply. Electricity is transmitted through distribution lines, and protection terminals are used to monitor and protect distribution lines and various power equipment. Protection terminals are distributed in different areas of the distribution network so that protection measures can be taken in the event of a fault, thereby quickly isolating the fault area and preventing the fault from spreading.

[0052] In the case of a permanent short circuit fault in the distribution line, in order to detect the location of the fault, each protection terminal in the line must first be sampled and calculated to obtain the effective value of the three-phase current of each protection terminal, and then the magnitude relationship between the three-phase current effective value amplitude of each protection terminal and the threshold value obtained can be compared to determine whether each protection terminal is located in the upstream section or downstream section of the fault point. Specifically, when a permanent short circuit fault occurs in the distribution line, the current will increase sharply. According to the current distribution characteristics of the power system, the fault current will flow from the power source to the fault point along the distribution line. For the protection terminal located upstream of the fault point, that is, on the power supply side, when a fault occurs, the current will flow from the power supply to the fault point through the protection terminal. At this time, the current increases significantly, and the effective value amplitude of the protection terminal often exceeds the threshold value; for the protection terminal located downstream of the fault point, that is, on the load side, when a fault occurs, there is usually no large amount of current flowing through the line downstream of the fault point, and the effective value amplitude of the protection terminal usually does not exceed the threshold value. In order to clearly and concisely indicate the relative position relationship between each protection terminal and the fault point when a fault occurs, this method generates a comprehensive judgment parameter, namely, the protection judgment parameter, by comparing the effective value amplitude and the threshold value. It can be understood that when each protection terminal transmits the relative position information between itself and the fault point, that is, the current state at the location of the terminal, compared with transmitting the complete three-phase current data, transmitting a single protection judgment parameter can significantly reduce the amount of data and improve the transmission efficiency.

[0053] The protection judgment parameters generated by each protection terminal reflect the current status of its corresponding monitoring area. By analyzing the protection judgment parameters of each protection terminal, the system can determine which terminals have detected currents exceeding the threshold value and which terminals have not. Through further screening, if a pair of adjacent protection terminals are found, one of which detects a current exceeding the threshold value and the other does not exceed the threshold value, it can be determined that the two protection terminals are located at both ends of the fault point, and the section between them is the fault section. The system then controls the two protection terminals to issue instructions to command circuit breakers and other devices to perform tripping operations, thereby effectively isolating the fault section.

[0054] It should be noted that after the distributed power source is connected to the distribution line, the current not only flows from the power source to the load, but there may also be a bidirectional current flow from the load to the power source. The fault isolation method provided by the present invention utilizes the judgment parameters generated by each protection terminal to realize real-time monitoring and direction distinction of current changes, ensuring that faults can still be accurately detected and located under bidirectional current conditions. In addition, the widespread access of distributed power sources will significantly increase the amount of data and communication burden in the distribution line. This method simplifies data transmission, significantly reduces communication bandwidth requirements, and can well adapt to the communication needs in a large-scale distributed power source environment.

[0055] Alternatively, if Figure 2 As shown, obtaining the effective value and threshold value of the three-phase current of each protection terminal includes: step S1022: obtaining the maximum load current and the maximum output current; step S1024: comparing the maximum load current and the maximum output current, and determining that the threshold value is the larger value between the two.

[0056] In this embodiment, in order to determine the threshold value, the maximum load current and the maximum output current must first be obtained. The maximum load current refers to the highest current value that the distribution network needs to carry under the maximum load condition. It reflects the current intensity transmitted by the line during the busiest period or at the peak of the load demand. The maximum load current can usually be calculated by the maximum load power and rated voltage of the distribution line. Factors affecting the maximum load current include load type, such as residential areas or industrial areas connected to the distribution line; and also include seasonal and time factors, such as air conditioning loads in summer will increase the current demand of the distribution network. The maximum output current refers to the highest current value that the distribution network can provide under the most ideal and safe operating conditions. This parameter reflects the maximum current capacity that the distribution line can carry under physical design and equipment limitations. The maximum output current is usually calculated based on the design capacity of the distribution network and the specifications of the distribution line. It can refer to the installed capacity of the distributed power source, or it can be determined by the allowable current density of the distribution line.

[0057] Considering the access of distributed power sources, if the installed capacity is large enough, it may change the magnitude and direction of the current flowing through the protection terminal under normal operation. Therefore, when selecting the threshold value, the method based on the rated current multiple in the traditional overcurrent protection should not be used, but the larger value of the maximum load current and the maximum output current should be taken. It can be understood that after the distributed power source is connected, the direction and magnitude of the current may change with the load. For example, when the load is low and the output of the distributed power source is high, the current may flow from the load end to the centralized power supply end. In this case, the traditional overcurrent protection may be misjudged as a fault, and the selection of a larger threshold value can effectively avoid such false operation. In addition, a higher threshold value can ensure that the protection terminal will not malfunction during normal load fluctuations or distributed power output fluctuations, thereby reducing unnecessary tripping and improving the stability of the system.

[0058] Alternatively, if Figure 3 As shown, before determining the protection judgment parameter corresponding to the protection terminal according to the effective value amplitude and threshold value corresponding to the effective value of the three-phase current, it also includes: step S1032: obtaining the current imbalance coefficient and the setting value of each protection terminal; step S1034: if the current imbalance coefficient is greater than the setting value, executing the step of determining the protection judgment parameter corresponding to the protection terminal according to the size relationship between the effective value amplitude and the threshold value corresponding to the effective value of the three-phase current; step S1036: if the current imbalance coefficient is less than or equal to the setting value, determining the protection judgment parameter corresponding to the protection terminal.

[0059] In this embodiment, before determining the protection judgment parameter corresponding to the protection terminal, the current unbalance coefficient of each protection terminal must first be obtained. Usually, the grounding method of the distributed power source is a neutral point non-effective grounding method. Under normal operation, there is almost only positive sequence current in the distribution line, and the current unbalance coefficient of each protection terminal is almost 0. Only when a fault occurs, zero sequence and negative sequence current will appear in the line. At this time, the current unbalance coefficient of each protection terminal is relatively large. Therefore, the current unbalance coefficient can be used as a basis for judging whether there is a fault in the distribution line. It can be understood that when the current unbalance coefficient of the protection terminal exceeds a certain threshold, that is, the set value that has been obtained, it can be determined that there is a fault in the line.

[0060] Generally speaking, the setting value is determined in the following way: when the distribution line is in a normal state, the current unbalance coefficient of each protection terminal is sampled to measure the range of the unbalance coefficient under normal conditions; then the unbalance coefficient value during normal fluctuations of the distribution network is counted, and the setting value should be set slightly higher than this value to avoid false triggering of protection due to normal operating fluctuations; in addition, in order to ensure the reliability and stability of the system in actual operation, a certain safety margin is usually added to the setting value to avoid false triggering under normal fluctuations. For example, under normal circumstances, the unbalance coefficient is about 3%, and the setting value can be set to be slightly higher than this value, such as 5%, to exclude the influence of normal fluctuations.

[0061] It can be understood that if the current imbalance coefficient is less than or equal to the set value, it means that the distribution line is operating normally and no fault has occurred. At this time, the protection judgment parameters corresponding to the protection terminal will be directly determined; if the current imbalance coefficient is greater than the set value, it means that there is a fault in the distribution line. At this time, the protection judgment parameters corresponding to the protection terminal will be determined according to the relationship between the effective value amplitude corresponding to the effective value of the three-phase current and the threshold value mentioned in the above scheme.

[0062] Alternatively, if Figure 4 As shown, according to the effective value amplitude and threshold value corresponding to the effective value of the three-phase current, the protection judgment parameter corresponding to the protection terminal is determined, including: step S1042: if the current imbalance coefficient is less than or equal to the setting value, the protection judgment parameter corresponding to the protection terminal is determined to be the first parameter; step S1044: if the current imbalance coefficient is greater than the setting value, and the effective value amplitude is greater than the threshold value, the protection judgment parameter corresponding to the protection terminal is determined to be the second parameter; step S1046: if the current imbalance coefficient is greater than the setting value, and the effective value amplitude is less than or equal to the threshold value, the protection judgment parameter corresponding to the protection terminal is determined to be the third parameter; wherein the second parameter is a fixed positive value, and the third parameter is a fixed negative value with the same absolute value as the second parameter but opposite sign.

[0063] In this embodiment, before determining the protection judgment parameter, the magnitude relationship between the current unbalance coefficient and the setting value will be compared first. If the current unbalance coefficient is less than or equal to the setting value, it means that the distribution line is operating normally and no fault occurs. Then the protection judgment parameter is directly determined to be the first parameter and set to 0. If the current unbalance coefficient is greater than the setting value, it can be determined that there is a fault in the distribution line at this time, and the relative position relationship between each protection terminal and the fault point needs to be further determined. Under the premise that there is a fault in the line, if the three-phase current effective value amplitude of the protection terminal is greater than the threshold value, it can be determined that the protection terminal is located upstream of the fault point, that is, on the power supply side. At this time, the protection judgment parameter corresponding to the protection terminal is determined to be the second parameter, which is set to a fixed positive value, such as 1, 2 or 3; if the three-phase current effective value amplitude of the protection terminal is less than or equal to the threshold value, it can be determined that the protection terminal is located downstream of the fault point, that is, on the load side. At this time, the protection judgment parameter corresponding to the protection terminal is determined to be the third parameter, which is set to a fixed negative value with the same absolute value as the second parameter but opposite sign, such as -1, -2 or -3.

[0064] Alternatively, if Figure 5 As shown, according to the protection judgment parameters corresponding to each protection terminal, the fault section where the permanent short circuit occurs is determined, including: step S1062: determining that two adjacent protection terminals are the local terminal and the opposite terminal; step S1064: determining the parameter difference corresponding to the local terminal according to the protection judgment parameters corresponding to the local terminal and the protection judgment parameters corresponding to the opposite terminal; step S1066: determining the fault section where the permanent short circuit occurs according to the parameter differences corresponding to multiple local terminals.

[0065] In this embodiment, after determining the protection judgment parameters corresponding to each protection terminal, the system will define the two adjacent protection terminals as the local terminal and the opposite terminal. When the system starts from a terminal to determine the fault location or detect the line status, the protection terminal is the local terminal, and the next terminal directly connected to the local terminal is the opposite terminal. Usually, the opposite terminal is located downstream or upstream of the local terminal, and is used to jointly monitor and protect the same line section. In order to accurately locate the fault section, each protection terminal needs to be used as the local terminal, and the parameter difference between the local terminal and the opposite terminal is calculated based on the protection judgment parameters of the local terminal and the opposite terminal. Since the current will suddenly increase in the fault section, this will cause the difference between the protection judgment parameters of the local terminal and the opposite terminal to increase significantly; while in the normal section, this difference is usually small or remains in the normal range. By determining the parameter difference of each pair of adjacent terminals, the section with a significantly prominent difference can be found, and then the section where a permanent short circuit fault occurs can be determined.

[0066] Alternatively, if Figure 6As shown, according to the protection judgment parameters corresponding to the local terminal and the protection judgment parameters corresponding to the opposite terminal, the parameter difference corresponding to the local terminal is determined, including: step S10642: determining the parameter difference as the difference obtained by subtracting the protection judgment parameter corresponding to the opposite terminal from the protection judgment parameter corresponding to the local terminal.

[0067] In this embodiment, the difference calculation method of subtracting the protection judgment parameter of the other end from the local end is adopted for each terminal, and a consistent directional standard can be established. The protection system can uniformly analyze the difference of all the terminals on the line to avoid confusion caused by different calculation directions. This consistency can ensure that the difference distribution has a clear pattern in the whole line, which is convenient for the system to quickly identify abnormal sections.

[0068] Optionally, it also includes: controlling the protection terminals located at both ends of the fault section to perform isolation protection actions, including: controlling the protection terminals located at both ends of the fault section to perform three-phase tripping actions of circuit breakers.

[0069] In this technical solution, after detecting the fault section, the system will control the protection terminals at both ends of the fault section to perform isolation operations to cut off the current in the fault section. Specifically, the system will instruct the circuit breakers of the protection terminals at both ends of the fault section to perform three-phase tripping, that is, disconnect the three-phase current. This tripping action will completely isolate the fault section, separate the power supply of the fault section from the normal section, and prevent the fault impact from spreading to other areas, thereby protecting the safety and stability of the entire distribution network.

[0070] In a specific embodiment, Figure 8 In the distribution network shown, the distribution network 700 is connected to the trunk line L0 and works together with the centralized power source 600. The centralized power source 600 has a large and stable power generation capacity and is the main force of the power system, which can provide continuous power supply guarantee for users in a large area; the distributed power source DG can reduce the pressure of the centralized power source during peak hours, especially in periods with abundant wind and solar resources or high electricity prices, provide supplementary power, and improve the reliability and stability of the power system.

[0071] The distribution network 700 is composed of a distributed power source DG, a distribution line L1 and a protection terminal 701. When the distribution network operates normally, the current flows stably to the load 801 to provide power guarantee for residents or factories.

[0072] This method is implemented when a permanent short circuit fault F occurs in the distribution line L1. The specific implementation method is as follows:

[0073] The first step is sampling calculation. That is, each protection terminal device i performs discrete Fourier calculation after sampling the three-phase current value, and the effective value of the three-phase current can be obtained. Three-sequence current value I i.0 ,I i.1,I i.2 and current unbalance factor Etc., where the three-sequence current value can be calculated by the complex number method based on the three-phase current value.

[0074] The second step is to compare each protection terminal according to the protection criteria to determine the fault direction. According to industry standards, the grounding method of distributed power supply should be consistent with the grounding method on the distribution network side, so both are neutral point non-effective grounding methods. Under normal operation, there is still almost only positive sequence current in the distribution line, and the current imbalance coefficient is almost 0. In the case of fault operation, zero sequence and negative sequence current will appear in the line, and the current imbalance coefficient is large. Therefore, the current imbalance coefficient is used as the protection start criterion. Under normal operation of the line, the protection judgment result is "0".

[0075] If the current unbalance coefficient is greater than the set value, it is judged that a fault has occurred in the system. With threshold value I set Comparison is made to determine the fault direction. If the amplitude of the effective value of any phase current is greater than the threshold value, it is considered that the protection terminal is located in the upstream section of the fault point, and the protection judgment result is "1"; otherwise, it is considered that the protection terminal is located in the downstream section of the fault point, and the protection judgment result is "-1". Considering the access of distributed power sources, if the installed capacity is large enough, it may change the magnitude and direction of the current flowing through the protection terminal under normal operation. Therefore, the threshold value I set The selection of the threshold value of overcurrent protection is different from that of the traditional overcurrent protection, which takes multiples of the rated current. The maximum load current I Load.max and maximum output current I DG.max The larger value of I set =max{I Load.max ,I DG.max}.

[0076] Among them, the maximum load current is determined by all loads carried downstream of the line where the protection terminal is located, and the maximum output current is determined by the installed capacity of the distributed power source. In summary, the conditions for different protection judgments of each protection terminal are as follows:

[0077] When the current unbalance coefficient is less than or equal to the setting value, the judgment result Result = "0";

[0078] When the current unbalance coefficient is greater than the set value and the phase current effective value amplitude is greater than the threshold value, the judgment result Result = "1";

[0079] When the current unbalance coefficient is greater than the set value and the amplitude of the phase current effective value is less than or equal to the threshold value, the judgment result Result = "-1".

[0080] The third step is to transmit the results. Each protection terminal transmits the judgment results with time stamp to the adjacent terminals through the communication channel, and transmits them once for each sampling calculation and judgment.

[0081] The fourth step is to determine the location of the protection terminal based on the differential principle. After receiving the protection judgment result sent by the adjacent terminal j, the protection terminal i compares the protection judgment result of the sampling time closest to the time stamp of the local terminal and the opposite terminal. Based on the differential principle, the results on both sides are subtracted, with the local result in front and the adjacent terminal result received in the back. All possible judgment results are as follows, with a total of four cases:

[0082] (1) The local protection judgment result Result=1, and the received opposite protection judgment result Result=-1. The difference between the two is 2, indicating that the protection terminal is located at the power supply side at both ends of the fault section.

[0083] (2) The local protection judgment result Result = -1, the received peer protection judgment result Result = 1, and the difference between the two is -2, indicating that the protection terminal is located at the load side of the two ends of the fault section.

[0084] (3) The local protection judgment result Result=1, the received peer protection judgment result Result=1, and the difference between the two is 0, indicating that the protection terminal is not at both ends of the fault section, but only located in the upstream section of the fault point.

[0085] (4) The local protection judgment result Result = -1, and the received peer protection judgment result Result = -1. The difference between the two is 0, indicating that the protection terminal is not at either end of the fault section, but only located in the downstream section of the fault point.

[0086] In summary, the differences in protection judgment results at both ends of the fault section and the non-fault section are as follows:

[0087] At both ends of the fault segment:

[0088] (1) Power supply side of the fault section: Result 本端 -Result 对端 =2;

[0089] (2) Load side of fault section: Result 本端 -Result 对端 =-2;

[0090] At both ends of the non-faulty segment:

[0091] (1) Upstream of the fault point: Result 本端 -Result 对端 =0;

[0092] (2) Upstream of the fault point: Result 本端 -Result 对端 =0;

[0093] The fifth step is to control the three-phase tripping of the circuit breaker by the protection terminal located on the power supply side at both ends of the fault section. According to the calculation results based on the differential principle in the previous step, the position of the protection terminal can be determined by the difference between the protection judgment result of the local end and the protection judgment result received from the opposite end, and the next protection action of the terminal at different positions can be given, as shown below. Among them, the protection terminals located at both ends of the fault section control the three-phase tripping of the circuit breaker.

[0094] (1) Protection judgment result difference Result corresponding to the protection terminal 本端 -Result 对端 >1, the protection terminal executes the protection action and controls the three-phase tripping of the circuit breaker;

[0095] (2) Protection judgment result difference Result corresponding to the protection terminal 本端 -Result 对端 When <-1, the protection terminal remains in the protection start state and waits for the action signal;

[0096] (3) Protection judgment result difference Result corresponding to the protection terminal 本端 -Result 对端 =0, protection exits.

[0097] Alternatively, if Figure 7 As shown, the embodiment of the present application provides a fault isolation device 900. The fault isolation device 900 includes an acquisition module 901, a parameter determination module 902, a fault location module 903, and a control module 904.

[0098] Among them, the acquisition module 901 is used to obtain the effective value and threshold value of the three-phase current of each protection terminal; the parameter determination module 902 is used to determine the protection judgment parameters corresponding to the protection terminal; the fault location module 903 is used to determine the fault section where a permanent short circuit occurs; the control module 904 is used to control the protection terminals located at both ends of the fault section to perform isolation protection actions.

[0099] The fault isolation device 900 in the embodiment of the present application can be a device, or a component, integrated circuit, or chip in a terminal. The device can be a mobile electronic device or a non-mobile electronic device. Exemplarily, the mobile electronic device can be a mobile phone, a tablet computer, a laptop computer, a PDA, an in-vehicle electronic device, a wearable device, an ultra-mobile personal computer (UMPC), a netbook, or a personal digital assistant (PDA), etc. The non-mobile electronic device can be a server, a network attached storage (NAS), a personal computer (PC), a television (TV), a teller machine or a self-service machine, etc., which is not specifically limited in the embodiment of the present application.

[0100] The fault isolation device 900 in the embodiment of the present application may be a device having an operating system. The operating system may be an Android operating system, an iOS operating system, or other possible operating systems, which are not specifically limited in the embodiment of the present application.

[0101] The fault isolation device 900 provided in the embodiment of the present application can achieve Figures 1 to 6 To avoid repetition, the various processes implemented by the method embodiment are not described here.

[0102] Alternatively, if Fig. 9 As shown, an embodiment of the present application also provides a distribution network 1000, including a processor 1110, a memory 1109, and a program or instruction stored in the memory 1109 and executable on the processor 1110. When the program or instruction is executed by the processor 1110, each process of the embodiment of the above-mentioned fault isolation method is implemented, and the same technical effect can be achieved. To avoid repetition, it will not be repeated here.

[0103] It should be noted that the electronic devices in the embodiments of the present application include electronic devices and non-electronic devices.

[0104] Among them, the processor 1110 is used to obtain the three-phase current effective value and threshold value of each protection terminal; determine the protection judgment parameter corresponding to the protection terminal according to the effective value amplitude and threshold value corresponding to the three-phase current effective value; determine the fault section where the permanent short circuit occurs according to the protection judgment parameter corresponding to each protection terminal; control the protection terminals located at both ends of the fault section to perform isolation protection actions.

[0105] Optionally, the processor 1110 is further configured to obtain a maximum load current and a maximum output current; compare the maximum load current and the maximum output current, and determine that the threshold value is a larger value between the two.

[0106] Optionally, processor 1110 is also used to obtain the current imbalance coefficient and setting value of each protection terminal; if the current imbalance coefficient is greater than the setting value, the step of determining the protection judgment parameter corresponding to the protection terminal according to the relationship between the effective value amplitude corresponding to the effective value of the three-phase current and the threshold value is executed; if the current imbalance coefficient is less than or equal to the setting value, the protection judgment parameter corresponding to the protection terminal is determined.

[0107] Optionally, processor 1110 is also used to determine that two adjacent protection terminals are a local terminal and an opposite terminal; determine a parameter difference corresponding to the local terminal based on a protection judgment parameter corresponding to the local terminal and a protection judgment parameter corresponding to the opposite terminal; and determine a fault section where a permanent short circuit occurs based on parameter differences corresponding to multiple local terminals.

[0108] Optionally, the processor 1110 is further configured to determine that the parameter difference is a difference obtained by subtracting a protection judgment parameter corresponding to the opposite terminal from a protection judgment parameter corresponding to the local terminal.

[0109] Optionally, the processor 1110 is further configured to control protection terminals located at both ends of the fault section to execute a three-phase tripping action of the circuit breaker.

[0110] An embodiment of the present application also provides a readable storage medium, on which a program or instruction is stored. When the program or instruction is executed by a processor, the various processes of the above-mentioned fault isolation method embodiment are implemented, and the same technical effect can be achieved. To avoid repetition, it will not be repeated here.

[0111] The methods may be implemented in a variety of different ways depending on the specific features and / or example applications. For example, the methods may be implemented by a combination of hardware, firmware, and / or software. For example, in a hardware implementation, the processor may be implemented in one or more application specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), field programmable gate arrays (FPGAs), controllers, microcontrollers, microprocessors, electronic devices, other device units for performing the above functions, and / or combinations thereof.

[0112] A computer readable storage medium may be a tangible device that can retain and store instructions for use by an instruction execution device. A computer readable storage medium may be an electronic storage device, a magnetic storage device, an optical storage device, an electromagnetic storage device, a semiconductor storage device, or any suitable combination of the above devices, but is not limited thereto. A non-exhaustive list of more specific examples of computer readable storage media includes: portable computer floppy disks, hard disks, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), static random access memory (SRAM), portable compact disk read-only memory (CD-ROM), digital versatile disk (DVD), memory card, floppy disk, encoding mechanical device (such as a punch card or a groove with a raised structure with instructions recorded) and any suitable combination of the above devices. The computer readable storage medium used herein should not be understood as a transmission signal itself, such as a radio wave or other freely propagating electromagnetic wave, an electromagnetic wave propagating through a waveguide or other transmission medium, or an electrical signal transmitted through a wire, etc.

[0113] The processor is the processor in the electronic device in the above embodiment. The readable storage medium includes a computer readable storage medium, such as a computer read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk.

[0114] An embodiment of the present application further provides a chip, which includes a processor and a communication interface, wherein the communication interface and the processor are coupled, and the processor is used to run programs or instructions to implement the various processes of the above-mentioned fault isolation method embodiment, and can achieve the same technical effect. To avoid repetition, it will not be repeated here.

[0115] It should be understood that the chip mentioned in the embodiments of the present application can also be called a system-level chip, a system chip, a chip system or a system-on-chip chip, etc.

[0116] It should be noted that, in this article, the terms "comprise", "include" or any other variant thereof are intended to cover non-exclusive inclusion, so that the process, method, article or device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise one..." do not exclude the presence of other identical elements in the process, method, article or device including the element. In addition, it should be pointed out that the scope of the methods and devices in the embodiments of the present application is not limited to performing functions in the order shown or discussed, and may also include performing functions in a substantially simultaneous manner or in reverse order according to the functions involved, for example, the described method may be performed in an order different from that described, and various steps may also be added, omitted, or combined. In addition, the features described with reference to certain examples may be combined in other examples.

[0117] Through the description of the above implementation methods, those skilled in the art can clearly understand that the above-mentioned embodiment methods can be implemented by means of software plus a necessary general hardware platform, and of course by hardware, but in many cases the former is a better implementation method. Based on such an understanding, the technical solution of the present application, or the part that contributes to the prior art, can be embodied in the form of a computer software product, which is stored in a storage medium (such as ROM / RAM, a disk, or an optical disk), and includes a number of instructions for a terminal (which can be a mobile phone, a computer, a server, or a network device, etc.) to execute the methods described in each embodiment of the present application.

[0118] The embodiments of the present application are described above in conjunction with the accompanying drawings, but the present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of the present application, ordinary technicians in this field can also make many forms without departing from the purpose of the present application and the scope of protection of the claims, all of which are within the protection of the present application.

Claims

1. A fault isolation method, characterized in that: For a distribution network, the distribution network includes a distributed power source, a distribution line and a plurality of protection terminals, and the fault isolation method includes: Obtaining the three-phase current effective value and threshold value of each protection terminal; Determining a protection judgment parameter corresponding to the protection terminal according to the effective value amplitude corresponding to the three-phase current effective value and the threshold value; Determining the fault section where the permanent short circuit occurs according to the protection judgment parameter corresponding to each of the protection terminals; The protection terminals located at both ends of the fault section are controlled to perform isolation protection actions.

2. The fault isolation method according to claim 1, characterized in that: The obtaining of the three-phase current effective value and threshold value of each protection terminal includes: Get the maximum load current and maximum output current; The maximum load current and the maximum output current are compared to determine that the threshold value is a larger value between the two.

3. The fault isolation method according to claim 1, characterized in that: Before determining the protection judgment parameter corresponding to the protection terminal according to the effective value amplitude corresponding to the three-phase current effective value and the threshold value, the method further includes: Obtaining a current unbalance coefficient and a setting value of each of the protection terminals; If the current unbalance coefficient is greater than the set value, the step of determining the protection judgment parameter corresponding to the protection terminal according to the effective value amplitude corresponding to the three-phase current effective value and the threshold value is performed; If the current unbalance coefficient is less than or equal to the set value, a protection judgment parameter corresponding to the protection terminal is determined.

4. The fault isolation method according to claim 3, characterized in that: The determining, according to the effective value amplitude corresponding to the three-phase current effective value and the threshold value, a protection judgment parameter corresponding to the protection terminal includes: If the current unbalance coefficient is less than or equal to the set value, determining that the protection judgment parameter corresponding to the protection terminal is the first parameter; If the current unbalance coefficient is greater than the set value, and the effective value amplitude is greater than the threshold value, determining that the protection judgment parameter corresponding to the protection terminal is the second parameter; If the current unbalance coefficient is greater than the set value, and the effective value amplitude is less than or equal to the threshold value, determining that the protection judgment parameter corresponding to the protection terminal is a third parameter; The second parameter is a fixed positive value, and the third parameter is a fixed negative value having the same absolute value as the second parameter but an opposite sign.

5. The fault isolation method according to claim 1, characterized in that: The step of determining the fault section where the permanent short circuit occurs according to the protection judgment parameter corresponding to each protection terminal includes: Determine that the two adjacent protection terminals are a local terminal and a peer terminal; Determining a parameter difference corresponding to the local terminal according to the protection judgment parameter corresponding to the local terminal and the protection judgment parameter corresponding to the opposite terminal; The fault section where the permanent short circuit occurs is determined according to the parameter differences corresponding to the multiple local terminals.

6. The fault isolation method according to claim 5, characterized in that: The determining, according to the protection judgment parameter corresponding to the local terminal and the protection judgment parameter corresponding to the opposite terminal, a parameter difference corresponding to the local terminal includes: The parameter difference is determined to be a difference obtained by subtracting the protection judgment parameter corresponding to the opposite terminal from the protection judgment parameter corresponding to the local terminal.

7. The fault isolation method according to claim 1, characterized in that: The controlling the protection terminals located at both ends of the fault section to perform isolation protection actions includes: The protection terminals located at both ends of the fault section are controlled to perform a three-phase tripping action of the circuit breaker.

8. A fault isolation device, characterized in that: Used in a distribution network, the distribution network includes a distributed power source, a distribution line and a plurality of protection terminals, the fault isolation device includes: An acquisition module, used for acquiring the effective value and threshold value of the three-phase current of each protection terminal; A parameter determination module, used to determine the protection judgment parameter corresponding to the protection terminal according to the effective value amplitude corresponding to the three-phase current effective value and the threshold value; A fault location module, used to determine the fault section where a permanent short circuit occurs according to the protection judgment parameter corresponding to each of the protection terminals; The control module is used to control the protection terminals located at both ends of the fault section to perform isolation protection actions.

9. A distribution network, characterized in that: include: The fault isolation device as claimed in claim 8; A distributed power source, used to provide power to the distribution network; Distribution lines, used to achieve power transmission; Protection terminal, used to detect faults and perform protection actions.

10. A distribution network, characterized in that: The method comprises a processor, a memory, and a program or instruction stored in the memory and executable on the processor, wherein the program or instruction, when executed by the processor, implements the steps of the fault isolation method as claimed in any one of claims 1 to 7.

11. A readable storage medium, characterized in that: The readable storage medium stores a program or an instruction, and when the program or the instruction is executed by the processor, the steps of the fault isolation method according to any one of claims 1 to 7 are implemented.

12. A chip, characterized in that: The chip includes a processor and a communication interface, the communication interface is coupled to the processor, and the processor is used to run a program or instruction to implement the steps of the fault isolation method according to any one of claims 1 to 7.

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