小电流接地系统单相接地故障选线的小波方法

Single-phase Earth-fault Protection in Distribution System Based on Wavelet Transform

针对小电流接地系统发生单相接地故障时选线问题 ,提出了一种基于小波变换的选线方法。该方法采取区段内小波系数线性叠加后再比较选线的方法 ,充分地利用了故障信息 ,更明显地突出了区分故障状态和正常运行状态的特征量 ,从而达到了准确选线的目的。 EMTP仿真分析的结果表明 。

Aimed at fault circuit selection on single phase earth fault in distribution system, a method of fault circuit selection based on wavelet transform is employed. The criteria of this method that selects fault circuit by linear plus of wavelet coefficient and comparing uses the fault information effectively, distinguishes the eigenvalue in the state of fault and normal in evidence, so the purpose of fault circuit selection is carried out. EMTP simulation shows that the method is effective and reliable.