Power distribution network line single-phase ground fault positioning method, device, apparatus and system

CN122449282APending Publication Date: 2026-07-24YICHUN POWER SUPPLY COMPANY OF STATE GRID HEILONGJIANG ELECTRIC POWER COMPANY
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
YICHUN POWER SUPPLY COMPANY OF STATE GRID HEILONGJIANG ELECTRIC POWER COMPANY
Filing Date
2026-06-16
Publication Date
2026-07-24

AI Technical Summary

Technical Problem

In power distribution networks, single-phase grounding faults are difficult to locate accurately, especially under low-current grounding methods, where the phase relationship between zero-sequence current and zero-sequence voltage is ambiguous, leading to inaccurate location.

Method used

By collecting the zero-sequence current and ground current and voltage of the three-phase lines at the beginning and end of each section of the distribution network, the first, second and third fault characteristics are constructed. Combined with the support vector machine (SVM) fault section location model, the fault location is performed.

Benefits of technology

It improves the accuracy and reliability of fault location, enhances anti-interference capabilities, and ensures the stability of distribution network lines.

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Abstract

The application relates to the technical field of single-phase grounding fault positioning, in particular to a power distribution network line single-phase grounding fault positioning method, device, apparatus and system, which specifically comprises the following steps: constructing a first fault feature by correlating the data change and phase change between the three-phase line zero-sequence current and the ground wire current at the beginning and end of each section of the power distribution network in each cycle, constructing a second fault feature by analyzing the zero-sequence current difference at the beginning and end of each section, and constructing a third fault feature by analyzing the active component difference of the ground wire current at the beginning and end of each section; based on the three fault features, the original electrical quantity is combined to train an SVM fault section positioning model, the trained model is used for power distribution network line single-phase grounding fault positioning, the fault feature recognition capability is enhanced, the anti-interference capability and reliability of fault positioning are improved, and the stability of power distribution network line operation is ensured.
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