Travelling wave based fault location for teed circuits using unsynchronised measurements

This paper presents a travelling wave based fault location algorithm for teed circuits using unsynchronized measurements. Wavelets transform is used for analyzing power system fault transients in order to capture the travel time of the transients along the monitored lines between the fault point and relays. The proposed method is based on techniques developed earlier for two terminal lines. The fault location is determined by taking time difference between arrival of the backward and forward travelling waves for synchronized measurements. An analytical procedure is applied for synchronization of signals. The algorithm gives accurate results for the three terminal lines under different fault conditions. The performance of the algorithm is tested in MATLAB environment.