基于脉冲注入的输电线路故障测距法

Fault location approach on transmission line based on impulse injection

在故障线路的始端或末端注入脉冲信号并记录脉冲的波形,通过对波形的分析计算实现故障定位。对永久性接地故障,该方法可实现故障选相并进行定位。仿真表明,该方法不受系统阻抗及过渡电阻的影响,具有很高的精度。

The reason for the poor accuracy of existing fault location methods of transmission line are discussed, and a new fault locating method based on the impulse injection is proposed.The impulse injected in the beginning or terminal of the faulty line can be recorded,and the fault point is located.When permanent phase-to-ground faults occur,this method can be used to identify the fault phases and justify fault location.Simulation by EMTP has proved that the method not only improves accuracy,but also is not affected by system impendence and fault resistance.