输电线路雷击点与闪络点不一致的辨识与定位

Inconsistent identification and location of transmission line lightning point and flashover point

当输电线路遭受雷击导致故障,而雷击点与闪络点位置不同时,双端测距将定位至雷击点而非闪络点,行波测距精度会受到不利影响。根据双端感受到的后续波头中与首波头极性相同的第一个波头含有的故障信息,对雷击点与闪络点的一致性进行辨识。并且提出"距离一致性比较"的方法对雷击点与闪络点不一致情况进行闪络点定位,同时对该测距方法进行适用性以及影响因素分析。仿真实验和实测数据验证了所提新方法的可靠性和有效性。

When the transmission lines fault occurred due to lightning strike, and the lightning strike point is not the same as flashover point, double ended traveling wave fault location device will locate out lightning strike point rather than flashover point. So traveling wave location accuracy will be adversely affected. Based on the fault information of the first head that double ended felt in subsequent wave heads which polarity is the same as first wave head, this paper identifies the consistency of lightning strike point and flashover point, and proposes the method of ＂distance consistency comparison＂ to locate flashover point when lightning strike point and flashover point are inconsistent. Meanwhile, the applicability and influencing factors of the location method are analyzed. Simulation experiment and real data verify the reliability and validity of proposed new method.