配电混合线路双端行波测距方法的研究

故障行波在配电网混合线路中运动过程复杂,从线路一端测量的行波中很难识别出故障点反射波,因此无外加信号源的单端行波测距法不适合配电混合线路故障定位.双端行波测距法由于只需检测故障初始行波到达线路两端的准确时间,不需考虑后续折、反射波,测距结果可靠.但在混合线路中由于行波波速不恒定导致传统的双端测距法不再适用.针对这一问题...

The Study on the Fault Location Based on Double Ended Traveling Wave Method in Hybrid Lines in Distribution Network

The propagation of the fault wave is very complex in hybrid lines in distribution network.It is difficult to identify the wave which reflected back from the point of failure by single terminal location method without external signal source so the method is not applicable in this condition.Double ended fault location method only needs to detect the exact time when the initial wave barrier first arrive to the both end of the line and don’t have to consider the refraction and reflection wave.So the results obtained from this method are reliable.But the velocity of wave varied widely in overhead lines and cable lines and this lead to the failure of the traditional double-ended fault location method.For this problem the paper proposed a fault search algorithm based on the variable of time and according to the algorithm we put forward a fault location solution for hybrid lines with branch.At last the effectiveness of the method is proved by ATP simulation.