Study of fault locating for transmission line double terminal traveling waves unrelated to wave speed

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.