Single-phase earth fault centralized studying and judging method and system based on real-model test field

Abstract

The invention relates to a single-phase earth fault centralized studying and judging method and system based on a real-type test field, and the method comprises the steps: repeatedly triggering a single-phase earth fault based on the real-type test field, and verifying the recording starting performance and communication parameter K value performance of a power distribution terminal after the single-phase earth fault occurs; mapping the wave recording starting performance and the communication parameter K value performance to a criterion rule, and screening out an optimal wave recording starting constant value and an optimal communication parameter K value; configuring a power distribution terminal by using the optimal wave recording starting constant value and the optimal communication parameter K value; and changing the type of the current single-phase earth fault, collecting recording data of the power distribution terminal after the current single-phase earth fault occurs, carrying out fault centralized study and judgment on the power transmission line based on the recording data to obtain a study and judgment result, and identifying the type of the current single-phase earth fault by using the configured power distribution terminal. According to the invention, the whole-process test technology of starting the wave recording of the power distribution terminal and transmitting the wave recording to the master station for centralized research and judgment during real-type single-phase grounding is realized.

Description

Technical Field

[0001] This invention relates to the field of power distribution automation technology, and mainly to a method and system for centralized analysis of single-phase grounding faults based on a real-world test field. Background Technology

[0002] Handling single-phase grounding faults in power distribution networks is a complex systems engineering project that requires close coordination between equipment inside and outside the substation. Single-phase grounding faults are diverse, each with its own characteristics and varying degrees of harm to the power grid. Different types of grounding faults require differentiated handling measures based on the actual site conditions.

[0003] Chinese invention patent application CN112098885A discloses a system and method for identifying faults in power distribution lines. The technical solution includes a feeder monitoring terminal for recording zero-sequence current and voltage when a sudden change in zero-sequence voltage occurs in the power distribution line, and sending a current recording start command; analyzing the recorded data, and sending zero-sequence voltage recording data when the zero-sequence voltage recording data indicates a single-phase ground fault; multiple fault analysis devices for recording three-phase current at multiple locations to be detected upon receiving the start command; analyzing the single-phase ground fault situation at each location to be detected based on the zero-sequence voltage recording data and the three-phase current recording data at each location to be detected; and a monitoring master station for locating the single-phase ground fault area based on the single-phase ground fault situation at multiple locations to be detected. However, the above technology... The current solution uses zero-sequence voltage mutation as the sole trigger condition for waveform recording initiation, without addressing the adjustment and optimization of waveform recording initiation settings and communication parameter K. This fixed initiation logic cannot adapt to complex and ever-changing fault scenarios, easily leading to missed or false initiation of waveform recording. Furthermore, the lack of optimized communication parameter design may affect the stability and accuracy of waveform data transmission, thus impacting subsequent fault analysis. In addition, the above technical solution only addresses the regional location of existing single-phase grounding faults, failing to meet the differentiated analysis needs of different types of single-phase grounding faults. It is only applicable to a single type of fault; when the fault type changes, the lack of corresponding adjustment to the judgment model easily leads to biased judgment results, making it impossible to achieve centralized judgment and accurate analysis of multiple types of faults.

[0004] Therefore, there is an urgent need for a judgment method that can fit the real-world scenario and improve the accuracy and reliability of fault line judgment. Summary of the Invention

[0005] To address the problems existing in the prior art, this invention proposes a centralized assessment method and system for single-phase grounding faults based on a real-world test field.

[0006] The technical solution of the present invention is as follows: On the one hand, this invention proposes a centralized assessment method for single-phase grounding faults based on a real-world test field, the method comprising: Based on repeated triggering of single-phase ground faults in a real-world test field, the waveform recording start-up performance and communication parameter K-value performance of the distribution terminal after a single-phase ground fault occur are verified; the waveform recording start-up performance and communication parameter K-value performance are mapped to a criterion rule to select the optimal waveform recording start-up setting and the optimal communication parameter K-value; the distribution terminal is configured using the optimal waveform recording start-up setting and the optimal communication parameter K-value. The type of the current single-phase ground fault is changed, the waveform data of the distribution terminal after the current single-phase ground fault occurs is collected, the fault is centrally analyzed on the transmission line based on the waveform data, the analysis result is obtained, and the type of the current single-phase ground fault is identified by the configured distribution terminal.

[0007] Preferably, the full-scale test site establishes a wireless communication environment with the power distribution master station, specifically as follows: The wireless communication environment includes a full-scale test field, a power distribution terminal, a wireless communication module, a front-end processor, and a power distribution master station; wherein, the full-scale test field and the power distribution terminal are connected via a wired network, the power distribution terminal and the wireless communication module are connected via a wireless network, the wireless communication module and the front-end processor are connected via a wired network, and the front-end processor and the power distribution master station are connected via a wired network.

[0008] Preferably, the real-scale test field is a medium- and low-voltage integrated real-scale verification platform used to simulate various single-phase grounding faults in the distribution network; The power distribution master station has data acquisition, monitoring, analysis and fault handling functions; The power distribution terminal includes a feeder terminal unit (FTU) and a high-precision fault indicator.

[0009] Preferably, the waveform recording start-up performance of the distribution terminal after a single-phase ground fault is verified, specifically as follows: Different adjustment threshold values ​​are set based on the zero-sequence voltage start-up threshold value and the electric field start-up threshold value of the power distribution terminal; Record the waveform recording start-up settings under different adjustment threshold values ​​after a single-phase ground fault occurs, and verify the waveform recording start-up performance of each waveform recording start-up setting; The waveform recording start-up performance is verified by the following indicators, including waveform recording duration, sampling frequency, waveform recording timeliness, and waveform recording reliability; The performance score for waveform recording startup is obtained by calculating each index based on preset weights.

[0010] Preferably, the performance of the communication parameter K value of the distribution terminal after a single-phase ground fault is verified, specifically as follows: The communication parameter K is set to multiple typical values, and a single-phase ground fault is repeatedly triggered a preset number of times for each typical value. Record the transmission performance of the distribution terminal under different typical values ​​after a single-phase ground fault occurs.

[0011] Preferably, the criterion rules include a waveform recording start setting criterion rule and a communication parameter K value criterion rule, wherein: The specific rule for determining the waveform recording start setting is to select the waveform recording start setting corresponding to the maximum waveform recording start performance score. The specific criterion rule for determining the value of the communication parameter K is to select the communication parameter K value corresponding to the optimal transmission performance.

[0012] Preferably, the types of single-phase grounding faults include ungrounded systems, systems grounded via arc suppression coils, metallic grounding, and high-resistance grounding.

[0013] Preferably, the centralized fault analysis includes analyzing the grounding line selection function, grounding section selection function, and fault early warning function of the transmission line; The grounding line selection function specifically involves centrally analyzing the recorded waveform data based on a waveform analysis algorithm to identify the faulty line. The grounding segment selection function specifically analyzes the differences in the recorded waveforms at different monitoring points on the faulty line to further determine the faulty section. The fault warning function specifically involves statistically analyzing the frequency of faults occurring on the faulty line within a preset time period. If the frequency exceeds a preset threshold, a warning signal is triggered.

[0014] Preferably, the configured power distribution terminal identification result is further compared with the current single-phase grounding fault type; If they match, it indicates that the fault diagnosis is correct, and the faulty line is identified. If they are inconsistent, it means that the fault centralized analysis step is correct, and the optimal waveform recording start setting and the optimal communication parameter K value are readjusted to configure the power distribution terminal.

[0015] On the other hand, the present invention also provides a centralized assessment system for single-phase grounding faults based on a real-world test field, the system comprising: The configuration module, based on repeated triggering of single-phase ground faults in a real-world test field, verifies the waveform recording start-up performance and communication parameter K-value performance of the distribution terminal after a single-phase ground fault occurs; maps the waveform recording start-up performance and communication parameter K-value performance to a criterion rule to select the optimal waveform recording start-up setting and the optimal communication parameter K-value; and configures the distribution terminal using the optimal waveform recording start-up setting and the optimal communication parameter K-value. The fault analysis module changes the type of the current single-phase grounding fault, collects the waveform data of the distribution terminal after the current single-phase grounding fault occurs, performs centralized fault analysis on the transmission line based on the waveform data, obtains the analysis result, and uses the configured distribution terminal to identify the type of the current single-phase grounding fault.

[0016] The present invention has the following beneficial effects: 1. This invention provides a centralized analysis method and system for single-phase grounding faults based on a real-world test field. Relying on a medium- and low-voltage integrated real-world verification platform, it accurately reproduces various real single-phase grounding faults in distribution networks, rather than the idealized and simplified simulations of traditional laboratories. At the same time, by combining the controlled variable method of repeated triggering of fixed faults and variable parameter testing, it ensures the authenticity of the test scenarios and the comparability of the data. It improves the engineering applicability of the test results, enhances the scenario coverage of fault simulation, and strengthens the authenticity and reliability of the test data. 2. This invention provides a centralized analysis method and system for single-phase grounding faults based on a real-world test field. It employs a dual-threshold combination test, using weighted scoring based on indicators such as recording duration, timeliness, and reliability to select the optimal combination. The communication parameter K value covers multiple typical values, balancing transmission efficiency and packet loss risk, with transmission rate and data integrity as core indicators for selecting the optimal value. This replaces the traditional method of statically configuring parameters based on experience, allowing the distribution terminal parameters to accurately adapt to the on-site fault characteristics and communication environment, improving the integrity and timeliness of the recorded data, and enhancing the fault response accuracy of the distribution terminal. 3. This invention provides a centralized analysis method and system for single-phase grounding faults based on a real-world test field. By recreating the transmission scenario of the on-site wireless public network, it solves the problem of data transmission when the front-end unit cannot access the operator's base station, improves the stability and security of data transmission, and enhances the anti-interference capability of the communication link. Attached Figure Description

[0017] Figure 1 This is a detailed flowchart of an embodiment of the present invention. Detailed Implementation

[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] It should be understood that the step numbers used in the text are for ease of description only and are not intended to limit the order in which the steps are performed.

[0020] It should be understood that the terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the invention. As used in this specification and the appended claims, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise.

[0021] The terms “comprising” and “including” indicate the presence of the described feature, whole, step, operation, element and / or component, but do not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components and / or collections thereof.

[0022] The term “and / or” refers to any combination of one or more of the associated listed items, as well as all possible combinations, and includes these combinations.

[0023] Example 1: See Figure 1 This invention provides a centralized assessment method for single-phase grounding faults based on a real-world test field, the method comprising: S1. Based on the real-world test field, repeatedly trigger a single-phase ground fault in an ungrounded system with a transition resistance of 2000Ω to verify the waveform recording start-up performance and communication parameter K value of the distribution terminal after the occurrence of a single-phase ground fault. S11. The aforementioned real-world test site establishes a wireless communication environment with the power distribution main station, specifically as follows: The wireless communication environment includes a full-scale test field, a power distribution terminal, a wireless communication module, a front-end processor, and a power distribution master station; wherein, the full-scale test field and the power distribution terminal are connected via a wired network, the power distribution terminal and the wireless communication module are connected via a wireless network, the wireless communication module and the front-end processor are connected via a wired network, and the front-end processor and the power distribution master station are connected via a wired network. Since the front-end unit is not connected to the telecommunications operator and cannot obtain terminal data packets through the operator's base station, a wireless communication module is added to the front of the front-end unit, and an IoT card with a fixed IP is activated to achieve data transmission between the terminal and the front-end encryption unit through a dedicated VPN. S12. The real-type test field is specifically a medium- and low-voltage integrated real-type verification platform, which is used to actually simulate various single-phase grounding faults in the distribution network. The power distribution master station has data acquisition, monitoring, analysis and fault handling functions; The power distribution terminal includes a feeder terminal unit (FTU) and a high-precision fault indicator. S13. Verify the waveform recording start-up performance of the distribution terminal after a single-phase ground fault occurs, specifically: Different adjustment threshold values ​​are set based on the zero-sequence voltage start-up threshold value and the electric field start-up threshold value of the power distribution terminal; In this embodiment, the zero-sequence voltage start-up threshold values ​​are respectively 5%, 10%, and 20% of the rated voltage, and the electric field start-up threshold values ​​are respectively 5%, 8%, and 10% of the rated electric field. The rated voltage is 6.5V and the rated electric field is 100V. Record the waveform recording start-up settings under different adjustment threshold values ​​after a single-phase ground fault occurs, and verify the waveform recording start-up performance of each waveform recording start-up setting; The waveform recording start-up performance is verified by the following indicators, including waveform recording duration, sampling frequency, waveform recording timeliness, and waveform recording reliability; The recording duration is at least 4 cycles before the fault plus 8 cycles after the fault. The sampling frequency is to meet the analysis requirements of the main station fault handling module. The timeliness of waveform recording refers to recording the waveform generation time of each terminal and verifying whether the main station generates waveforms in a timely manner when performing waveform recall. The reliability of the waveform recording is to store and verify the quality of the waveforms generated by each terminal to ensure that the waveforms can be used for analysis by the main station. The waveform recording startup performance score is obtained by calculating each index based on the preset weights. S14. Verify the performance of the communication parameter K value of the distribution terminal after a single-phase ground fault occurs, specifically: The communication parameter K is set to multiple typical values, and a single-phase ground fault is repeatedly triggered a preset number of times for each typical value. The communication parameter K value represents the number of consecutive information frames sent by the terminal in the IEC 104 protocol. It determines how many frames the power distribution terminal can send before receiving an acknowledgment. A larger K value can improve transmission efficiency, but it will increase network load and may lead to packet loss risk. A smaller K value can reduce packet loss risk, but it will reduce transmission efficiency. Multiple sets of tests were conducted by setting K values ​​of 8, 20, 50, and 200, and the transmission rate and waveform integrity were recorded. Record the transmission performance of the power distribution terminal under different typical values ​​after a fault occurs; S2. Map the waveform recording start performance and the communication parameter K value performance to the criterion rules, and select the optimal waveform recording start setting and the optimal communication parameter K value; In this embodiment, the communication parameter K is set to 200, the zero-sequence voltage start-up value is 10% of the rated voltage, and the electric field start-up value is 8% of the rated electric field. The criterion rules include the waveform recording start setting criterion rule and the communication parameter K value criterion rule, wherein: The specific rule for determining the waveform recording start setting is to select the waveform recording start setting corresponding to the maximum waveform recording start performance score. The specific criterion rule for determining the value of the communication parameter K is to select the communication parameter K value corresponding to the optimal transmission performance; S3. Change the type of the current single-phase ground fault, collect the waveform data of the distribution terminal after the current single-phase ground fault occurs, and perform centralized fault analysis on the transmission line based on the waveform data to obtain the analysis result; S31. Types of single-phase grounding faults include ungrounded systems, systems grounded through arc suppression coils, metallic grounding, and high-resistance grounding. S32. The centralized fault analysis includes analyzing the grounding line selection function, grounding section selection function, and fault early warning function of the transmission line; The grounding line selection function specifically involves centrally analyzing the recorded waveform data based on a waveform analysis algorithm to identify the faulty line. The grounding segment selection function specifically analyzes the differences in the recorded waveforms at different monitoring points on the faulty line to further determine the faulty section. The fault warning function specifically involves statistically analyzing the frequency of faults occurring on the faulty line within a preset time period. If the frequency exceeds a preset threshold, a warning signal is triggered. S4. And use the configured power distribution terminal to identify the type of the current single-phase ground fault; Different types of single-phase grounding faults have different effects on the voltage and current of the distribution network. For example, the fault parameters detected by the distribution terminal differ greatly between single-phase grounding faults occurring in arc suppression coil grounding systems and ungrounded systems. By selecting the optimal parameters, it can be ensured that the distribution terminal accurately starts fault recording and quickly transmits data to the distribution master station. With the optimal parameters, after the terminal parameters are set, the possible changes in single-phase grounding faults on the line can be accurately identified and responded to in a timely manner. The configuration results of the power distribution terminal are then compared with the current type of single-phase grounding fault. If they match, it indicates that the fault diagnosis is correct, and the faulty line is identified. If they are inconsistent, it means that the fault centralized analysis step is correct, and the optimal waveform recording start setting and the optimal communication parameter K value are readjusted to configure the power distribution terminal. S5 also includes remote call testing, specifically: The power distribution master station remotely retrieves waveform files from the power distribution terminals and verifies and checks the standardization and completeness of the waveform files. The remote recall includes manual triggering and automatic triggering, wherein: The manual triggering method specifically refers to the waveform recall being performed manually by technicians. The automatic triggering method specifically refers to the system autonomously initiating waveform data recall when it detects abnormal line operation or a fault.

[0024] Example 2: This embodiment provides a centralized assessment system for single-phase grounding faults based on a full-scale test field. The system includes: The configuration module, based on repeated triggering of single-phase ground faults in a real-world test field, verifies the waveform recording start-up performance and communication parameter K-value performance of the distribution terminal after a single-phase ground fault occurs; maps the waveform recording start-up performance and communication parameter K-value performance to a criterion rule to select the optimal waveform recording start-up setting and the optimal communication parameter K-value; and configures the distribution terminal using the optimal waveform recording start-up setting and the optimal communication parameter K-value. The fault analysis module changes the type of the current single-phase grounding fault, collects the waveform data of the distribution terminal after the current single-phase grounding fault occurs, performs centralized fault analysis on the transmission line based on the waveform data, obtains the analysis result, and uses the configured distribution terminal to identify the type of the current single-phase grounding fault.

[0025] In this application embodiment, "at least one" refers to one or more, and "more than one" refers to two or more. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent the existence of A alone, A and B simultaneously, or B alone. A and B can be singular or plural. The character " / " generally indicates that the preceding and following related objects are in an "or" relationship. "At least one of the following" and similar expressions refer to any combination of these items, including any combination of singular or plural items. For example, at least one of a, b, and c can represent: a, b, c, a and b, a and c, b and c, or a and b and c, where a, b, and c can be single or multiple.

[0026] Those skilled in the art will recognize that the units and algorithm steps described in the embodiments disclosed herein can be implemented using electronic hardware, computer software, or a combination of electronic hardware and software. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0027] Those skilled in the art will understand that, for the sake of convenience and brevity, the specific working processes of the systems, devices, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here.

[0028] In the several embodiments provided in this application, any function, if implemented as a software functional unit and sold or used as an independent product, can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or a part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0029] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A centralized analysis method for single-phase grounding faults based on a full-scale test field, characterized in that, The method includes: Based on repeated triggering of single-phase ground faults in a real-world test field, the waveform recording start-up performance and communication parameter K-value performance of the distribution terminal after a single-phase ground fault occur are verified; the waveform recording start-up performance and communication parameter K-value performance are mapped to a criterion rule to select the optimal waveform recording start-up setting and the optimal communication parameter K-value; the distribution terminal is configured using the optimal waveform recording start-up setting and the optimal communication parameter K-value. The type of the current single-phase ground fault is changed, the waveform data of the distribution terminal after the current single-phase ground fault occurs is collected, the fault is centrally analyzed on the transmission line based on the waveform data, the analysis result is obtained, and the type of the current single-phase ground fault is identified by the configured distribution terminal.

2. The method for centralized analysis of single-phase grounding faults based on a real-world test field as described in claim 1, characterized in that, The real-world test site and the power distribution main station establish a wireless communication environment, specifically as follows: The wireless communication environment includes a full-scale test field, a power distribution terminal, a wireless communication module, a front-end processor, and a power distribution master station; wherein, the full-scale test field and the power distribution terminal are connected via a wired network, the power distribution terminal and the wireless communication module are connected via a wireless network, the wireless communication module and the front-end processor are connected via a wired network, and the front-end processor and the power distribution master station are connected via a wired network.

3. The method for centralized analysis of single-phase grounding faults based on a real-world test field according to claim 2, characterized in that, The real-scale test field is specifically a medium- and low-voltage integrated real-scale verification platform, used to simulate various single-phase grounding faults in the distribution network; The power distribution master station has data acquisition, monitoring, analysis and fault handling functions; The power distribution terminal includes a feeder terminal unit (FTU) and a high-precision fault indicator.

4. The method for centralized analysis of single-phase grounding faults based on a real-world test field as described in claim 1, characterized in that, The waveform recording startup performance of the distribution terminal after a single-phase ground fault is verified, specifically as follows: Different adjustment threshold values ​​are set based on the zero-sequence voltage start-up threshold value and the electric field start-up threshold value of the power distribution terminal; Record the waveform recording start-up settings under different adjustment threshold values ​​after a single-phase ground fault occurs, and verify the waveform recording start-up performance of each waveform recording start-up setting; The waveform recording start-up performance is verified by the following indicators, including waveform recording duration, sampling frequency, waveform recording timeliness, and waveform recording reliability; The performance score for waveform recording startup is obtained by calculating each index based on preset weights.

5. The method for centralized analysis of single-phase grounding faults based on a real-world test field as described in claim 1, characterized in that, The performance of the communication parameter K value of the distribution terminal after a single-phase ground fault is verified, specifically as follows: The communication parameter K is set to multiple typical values, and a single-phase ground fault is repeatedly triggered a preset number of times for each typical value. Record the transmission performance of the distribution terminal under different typical values ​​after a single-phase ground fault occurs.

6. The method for centralized analysis of single-phase grounding faults based on a real-world test field according to claim 1, characterized in that, The criterion rules include the waveform recording start setting criterion rule and the communication parameter K value criterion rule, wherein: The specific rule for determining the waveform recording start setting is to select the waveform recording start setting corresponding to the maximum waveform recording start performance score. The specific criterion rule for determining the value of the communication parameter K is to select the communication parameter K value corresponding to the optimal transmission performance.

7. The method for centralized analysis of single-phase grounding faults based on a real-world test field according to claim 1, characterized in that, Single-phase ground faults include ungrounded systems, systems grounded via arc suppression coils, metallic grounding, and high-resistance grounding.

8. The method for centralized analysis of single-phase grounding faults based on a real-world test field according to claim 1, characterized in that, The centralized fault analysis includes analyzing the grounding line selection function, grounding section selection function, and fault early warning function of transmission lines; The grounding line selection function specifically involves centrally analyzing the recorded waveform data based on a waveform analysis algorithm to identify the faulty line. The grounding segment selection function specifically analyzes the differences in the recorded waveforms at different monitoring points on the faulty line to further determine the faulty section. The fault warning function specifically involves statistically analyzing the frequency of faults occurring on the faulty line within a preset time period. If the frequency exceeds a preset threshold, a warning signal is triggered.

9. The method for centralized analysis of single-phase grounding faults based on a real-world test field according to claim 1, characterized in that, The configuration results of the power distribution terminal are then compared with the current type of single-phase grounding fault. If they match, it indicates that the fault diagnosis is correct, and the faulty line is identified. If they are inconsistent, it means that the fault centralized analysis step is correct, and the optimal waveform recording start setting and the optimal communication parameter K value are readjusted to configure the power distribution terminal.

10. A centralized assessment system for single-phase grounding faults based on a real-world test field, characterized in that, The system includes: The configuration module, based on repeated triggering of single-phase ground faults in a real-world test field, verifies the waveform recording start-up performance and communication parameter K-value performance of the distribution terminal after a single-phase ground fault occurs; maps the waveform recording start-up performance and communication parameter K-value performance to a criterion rule to select the optimal waveform recording start-up setting and the optimal communication parameter K-value; and configures the distribution terminal using the optimal waveform recording start-up setting and the optimal communication parameter K-value. The fault analysis module changes the type of the current single-phase grounding fault, collects the waveform data of the distribution terminal after the current single-phase grounding fault occurs, performs centralized fault analysis on the transmission line based on the waveform data, obtains the analysis result, and uses the configured distribution terminal to identify the type of the current single-phase grounding fault.

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