小波变换在配电网单相接地故障选线中的应用

小波变换克服了傅里叶分析的缺陷，能同时对时频局部化，具有很强的信号特征提取功能，可将其应用到小电流接地电网单相接地故障检测中。对故障后暂态电气量进行分解，利用小波变换系数作为判据实现故障选线，仿真实验表明该方法可以快速准确地检测出故障线路。

Application of wavelet transform to phase-to-ground fault detection in distribution system

Wavelet analysis overcomes the limitations of Fourier methods by employing the analysis functions localized in both time and frequency,with better capability in signal character abstracting.It is used in phase-to-ground fault detection for neutral ungrounded system.Post-fault transient electri-cal data are decomposed with wavelet transform and the wavelet transform coefficient is then used as the main criteria to detect the fault line.Simulative experiments show that the method proposed can pick out the fault line quickly and correctly.