Single-phase ground fault real-time positioning method and system based on smart meter

CN122109909APending Publication Date: 2026-05-29SICHUAN YANGCHEN XINTONG TECH CO LTD
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Patent Information

Authority / Receiving Office
CN ยท China
Patent Type
Applications(China)
Current Assignee / Owner
SICHUAN YANGCHEN XINTONG TECH CO LTD
Filing Date
2026-02-05
Publication Date
2026-05-29

AI Technical Summary

Technical Problem

Existing single-phase grounding fault location technology in power distribution networks suffers from low calculation accuracy, high misjudgment rate, poor node coordination, and difficulty in quickly locating the fault range. In particular, the location accuracy is insufficient at the junction of branch lines and user side, which requires maintenance personnel to check section by section, thus prolonging the fault handling time.

Method used

Based on the three-level node collaboration and multi-method fusion calculation of smart meters, the zero-sequence current and voltage are collected in real time by dividing the smart meters into Type-A, Type-B and Type-C. The theoretical zero-sequence current is calculated by combining the impedance characteristic method and the attenuation coefficient method. The fault location is located by combining the attenuation coefficient change rate and physical distance.

Benefits of technology

It improves fault location accuracy, reduces misjudgments, shortens fault handling cycles, adapts to power grid scenarios after the widespread adoption of smart meters, and reduces operation and maintenance difficulty.

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Abstract

The present application relates to the technical field of power system distribution network fault diagnosis, in particular to a single-phase grounding fault real-time positioning method and system based on smart meters, the system constructs Type-A, Type-B, Type-C three levels of smart meter nodes, each node has the functions of message generation and forwarding, edge real-time calculation and historical baseline storage. Type-C real-time collects zero sequence current and zero sequence voltage, compares the baseline to generate fault message and uploads to Type-B; Type-B fuses impedance characteristic method and attenuation coefficient method to calculate fusion theoretical zero sequence current, judges whether there is fault through relative error, compares the attenuation coefficient change rate to determine the fault branch, and combines the line spacing and zero sequence current to locate the fault position. The system contains smart meter nodes, data acquisition and baseline generation, fault message processing and fault positioning calculation modules, realizes real-time and accurate positioning of single-phase grounding fault, and adapts to the operation and maintenance needs of distribution network.
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