Fault Location Without Wave Velocity Influence Using Wavelet and Clark Transform

To eliminating the influence of traveling wave velocity on the fault location accuracy of the power line, a fault location method without wave velocity influence using Wavelet and Clark transform is developed in this paper. On the basis of the reflection characteristic analysis of fault traveling wave, the aerial mode component of the voltage traveling wave is obtained by Clark transform. Then, the fault time when the first three mode maximum appear on the measuring end is determined by the combination of the aerial mode component with Wavelet transform. Furthermore, a set of equations that is composed by the fault time and the fault distance is formed. This method is independent of the wave velocity and is not affected by the traveling wave velocity theoretically. The simulation results show that the developed method can reduce the relative error of the fault distance by less than 5%, which proves the validity and the accuracy of this method.