基于小波变换的配电网故障暂态量选线方法

小电流接地是中压电网中性点的典型接地方式。小电流接地电网的单相接地故障特征表明，故障暂态电流幅值比稳态对地电容电流大得多，而且几乎不受消弧线岗影响。冈此，利用暂态电流进行选线具有一定的优越性。为了精确提取故障时的暂态信号用于选线，利用小波变换工具对发生接地故障时各线路的暂念零序电流进行小波变换，提取线路故障信息。本文建立仿真模型对小电流接地电网的多种单相接地故障型式进行了仿真验证，证实了该方法的有效性。

Fault line selection method using transient components in power distribution network based on wavelet transform

The small current grounded system represents a typical scheme in MV power distribution networks.Single-phase-to-earth fault features of small current grounded system show that fault transient current amplitude is much greater than the steady capacitive current,and almost free from the influence of arc-suppression coil.Therefore,the use of transient current for line selection has certain superiority.In order to extract the fault transient signals accurately for fault selection,wavelet transform tool is used ...