﻿ 基于暂态特征突变量的配电网故障选线方法研究

# 基于暂态特征突变量的配电网故障选线方法研究The Research of a Method to Select Fault Line for Power Distribution Networks Based on Transient Quantity Mutation

Abstract: For the single-phase grounding fault in the power distribution, a method to select fault line was proposed in the paper. Firstly, wavelet decomposition was used to transient zero-sequence current of each line after fault; then, the percentage of the low frequency energy to the total energy, which were calculated by the wavelet coefficients, was used to distinguish strong or weak fault; finally, the fault line was selected by comparing the polarities of the wavelet packet decomposition coefficient in the strong fault situation, but comparing the transient zero-sequence energy in the weak fault situation. The MATLAB simulation results show that the method is proposed has good ability to carry out the fault line. The criterion can keep the high reliability when the circuit is bus-bar, high resistance or voltage zero grounding.

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