Small current grounding fault line selection method and device

The invention provides a small-current grounding fault line selection method and device, and the method comprises the steps: obtaining a zero-sequence transient signal of the zero-sequence current and voltage of each line after a small-current grounding fault occurs; decomposing the zero-sequence transient signal according to an empirical mode to obtain a plurality of fault features, and obtaining a fault feature vector data set according to the plurality of fault features and corresponding fault line numbers; and training a naive Bayes classifier according to the fault feature vector data set to obtain a target naive Bayes classifier, and outputting a fault line selection result through the target naive Bayes classifier. According to the invention, multiple fault feature criterion line selection is realized, the problem of low accuracy caused by single fault feature criterion line selection is solved, and the fault line selection accuracy is improved. 本发明提供了一种小电流接地故障选线方法及装置，包括：获取小电流接地故障发生后，各线路的零序电流电压的零序暂态信号；