摘要
分析了中性点经消弧线圈接地的小电流系统发生单相接地故障时的故障特征,总结了传统选线方法在中性点经消弧线圈接地运行方式下的缺陷,提出了一种新型的零序电流变量选线方法。该方法通过比较单相接地故障后,在消弧线圈不同补偿度时的线路零序电流的差别,识别出故障线路,有效地提高了单相接地故障选线的正确性。仿真的结果表明了该方法的有效性和可行性。
The characteristics of single-line-to-ground fault in anti-arc system are analyzed. The defects of traditional fault line delecting methods in anti-arc system are summarized. A new zero sequence current variable method is proposed for single-fine-to-ground fault fine delecting.By comparing zero sequence currents when extinction coil in different compensation level after single-fine-to-grand happens to identify the fault line.This method has effectively enhanced the correctness of single-fine-to-ground fault line delecting. The simulation case shows the effectiveness and feasibility of the proposed method.
出处
《华中电力》
2009年第2期1-4,共4页
Central China Electric Power
关键词
小电流接地系统
故障选线
消弧线圈
电流变量
non-direct-ground-system
fault line delecting
extinction coil
current variable
