Single-phase grounding fault wire selecting method and system thereof

Abstract

The invention discloses a single-phase grounding fault wire selecting method and a system thereof, wherein the method comprises the steps of respectively acquiring each line transient voltage signal by a voltage acquisition device; performing phase-model transformation on each line transient voltage signal by a data processing device, obtaining each line zero-module voltage and each line line-module voltage; performing wavelet transformation on each line zero-module voltage and each line line-module voltage by an upper computer for obtaining a corresponding zero-module voltage one-layer component and a line-module voltage one-layer component; determining the highest value of each line zero-module voltage one-layer component as a first suspected fault line by the upper computer, and determining the highest value of each line line-module voltage one-layer component as a second suspected fault line; determining whether the first suspected fault line and the second suspected fault line aresuperposed by the upper computer, and if yes, determining the line as the fault line. The single-phase grounding fault wire selecting method prevents a mis-judgment possibility caused by low line zero-sequence current and improves wire selecting reliability.

Description

technical field [0001] The present application relates to the technical field of power fault detection, in particular to a single-phase ground fault line selection method and system. Background technique [0002] With the rapid development of the electric power industry, there are more and more transmission lines in the power grid, resulting in more and more failures of transmission lines. If the failure of the transmission line is not checked and repaired in time, it will bring huge economic losses to people, and it will also bring great inconvenience to people's lives. [0003] The currently operating 6KV-66KV power grid generally adopts a small-current grounding system, and the operation mode of the small-current grounding system is neutral ungrounded or grounded through an arc suppression coil. However, in the operation mode where the neutral is not grounded or is grounded through the arc suppression coil, the probability of single-phase grounding faults is relatively h...

AI Technical Summary

Problems solved by technology

[0006] This application provides a single-phase ground fault line selection method and system to solve the problem in the prior art that misjudgment is prone to occur due to the small zero-sequence current of the line, which leads to inaccurate line selection

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