A single-phase ground fault detection method and system for an intelligent power distribution system

By constructing voltage-charge current-voltage characteristic trajectories and extracting geometric features, combined with template library matching, the algorithm complexity and stability issues of existing single-phase grounding fault detection methods are solved, achieving fast and accurate fault location and detection.

CN122150752BActive Publication Date: 2026-07-21HEFEI RONGYI ALUMINUM MOLD ENVIRONMENTAL TECH CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
HEFEI RONGYI ALUMINUM MOLD ENVIRONMENTAL TECH CO LTD
Filing Date
2026-05-07
Publication Date
2026-07-21

AI Technical Summary

Technical Problem

Existing single-phase grounding fault detection methods rely on numerical calculations between zero-sequence electrical quantities, resulting in complex algorithms and requiring improved stability near voltage zero crossings, making it difficult to quickly and accurately detect and locate single-phase grounding faults.

Method used

By collecting zero-sequence voltage and zero-sequence current, a voltage-charge current-voltage characteristic trajectory curve under a multi-scale sliding window is constructed. The geometric features of the trajectory are extracted and fused to obtain a comprehensive distortion coefficient, which is then compared with a dynamic threshold to determine the occurrence of a fault. The distortion direction is determined by matching with a fault template library. Finally, adjacent detection point pairs along the line where the distortion direction changes from positive to negative are found to locate the fault section.

Benefits of technology

It effectively avoids the stability bottleneck of traditional numerical calculation under specific working conditions, realizes rapid and accurate detection and reliable location of single-phase grounding faults, reduces the requirements for the computing power of detection devices, and adapts to complex fault scenarios and weak characteristic scenarios such as high-resistance grounding.

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Abstract

The present application relates to power distribution network single-phase ground fault detection method technical field, specifically, it relates to a kind of intelligent power distribution system single-phase ground fault detection method and system.The method includes collecting each detection point zero sequence voltage and current, the charge quantity is obtained by integrating current, and the voltage-charge data pair sequence is output by multi-scale sliding window;Then construct volt-ampere characteristic trajectory curve with voltage as abscissa and charge as ordinate;Extract its directed area sum, eccentricity and principal axis deflection angle change rate as geometric features, and the comprehensive distortion coefficient is obtained by fusion, when the comprehensive distortion coefficient of continuous multiple windows exceeds threshold value, confirm fault;Further calculate directed area, and the distortion direction is determined as positive, negative or pending, and the adjacent point pair is found along the line by master station when the distortion direction changes from positive to negative, and the section between the point pair is determined as fault section.The present application solves the problem of unstable values near voltage zero-crossing point, and realizes fault location without time synchronization.
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