与波速无关的输电线路双端行波故障测距研究

摘要

根据现有的输电线路双端行波故障测距原理,提出一种与波速无关的双端行波测距方法.采用小波变换法对行波信号进行分析,判断故障初始行波和故障点反射行波到达线路两端母线的时间,求解一组由距离、时间和速度组成的方程组,得到与波速无关的故障测距公式.理论上该方法不受行波波速的影响,并且具有较高的测距精度.通过Matlab软件仿真,证明了该方法的有效性和正确性.%An accurate fault locating method based on existing double-terminal traveling waves fault location principle is presented,which avoids the influence of traveling wave speed. This method uses wavelet transform to analyze traveling wave signals and determine the arrival time of the fault initial traveling waves and the reflected wave from the point of failure reaching both ends of bus bar. Then a group of equations involving distance, time and velocity is solved and the fault location formula unrelated to wave speed is obtained. In theory this method avoids the wave speed influence, and has high accuracy in fault location. The Matlab software simulative results prove its validity and correctness.