Power distribution network grounding and disconnection fault detection method based on phase parameter measurement

By constructing the phase parameters calculation matrix equation of the fault line of the distribution network, using the changes in zero-sequence voltage and zero-sequence current, high-precision and rapid detection of grounding and disconnection faults are achieved, and the problems of long and low efficiency in the existing technology are solved, which significantly improves detection efficiency and accuracy.

CN119716402AActive Publication Date: 2025-03-28HUNAN INSTITUTE OF SCIENCE AND TECHNOLOGY
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Patent Information

Application Number
CN202510003813.4
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-01-02
Publication Date
2025-03-28
Estimated Expiration
2045-01-02

AI Technical Summary

Technical Problem

The prior art is difficult to achieve high-precision and rapid detection of grounding and disconnection faults in the distribution network, and the fault detection method is usually only applicable to specific fault types and is difficult to be widely used.

Method used

By constructing the phase parameters of the fault line calculation matrix equation, using the changes of zero-sequence voltage and zero-sequence current, we solve the fault phase parameters and ground fault resistance, and horizontally compare the dynamic changes of each phase parameters to realize fault type identification and fault line selection.

Benefits of technology

It significantly reduces the fault detection time, improves the detection efficiency, and can realize the detection and type judgment of grounding faults and disconnection faults at the same time, reducing the detection cost and maintenance difficulty.

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Abstract

The invention discloses a power distribution network grounding and disconnection fault detection method based on phase parameter measurement, which actively regulates and controls zero sequence voltage, constructs an asymmetric line three-phase grounding distributed capacitance-conductance calculation matrix equation, and provides basic data support for deep cognition of a power distribution network and fault detection. According to the fault detection method provided by the invention, ground fault and broken line fault detection, fault type judgment and fault information acquisition can be realized only by comparing and analyzing phase parameter change characteristics before and after the fault, and complex operation processing does not need to be carried out on system electrical parameters; based on a phase parameter change rule caused by different fault types, unified detection of the grounding fault and the disconnection fault of the power distribution network is realized, the line selection limitation that a traditional fault detection method depends on fault characteristic signals is overcome, and the fault detection cost and the maintenance difficulty are effectively reduced.
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