基于小波变换的配电网单相接地故障选线方法

分析了配电系统发生单相接地时的故障特征，在研究了现有选线方法的基础上，提出了利用小波变换的奇异性检测理论进行故障选线的新方法。该方法对单相接地故障的暂态分量进行小波变换，通过比较零序电流小波变换模极大值的大小和极性判别出故障线路。MATLAB仿真结果表明，该方法能够准确、可靠地实现故障选线，且不受故障电阻及中性点接地方式的影响。

Single-Phase Earth Fault Line Selection Method Based on Power Distribution Network of Wavelet Transform

This paper analyses the fault characteristics when a single-phase earth fault happened in distribution system. On the basis of studying the present fault line selection methods, a new method that uses the singularity detection theory of wavelet transform to select the fault line is introduced in this paper. The single-phase earth fault transient component with wavelets is transformed with this method; the fault line is detected through comparing the magnitude and polarity of wavelet transform of zero sequence currents. The MATLAB simulation tests show that the method is able to realize the fault line selection accurately and reliably, and it also immunes from the fault resistance and the neutral grounding modes.