Study of Fault Location in Transmission Line Using S Transform

The purpose of this paper is to provide a fault location algorithm based on S transform method in transmission line. When a fault occurs in transmission line, the point of the fault will generate traveling waves moving to both sides of the bus. The key of fault location based on traveling waves is accurately recognition of wave front. S transform can independently analyze the characteristic of the signal's amplitude change over time on each frequency component so as to accurately judge the mutation time of the traveling wave signal and determine the location of the wave front. Simulations have performed in EMTP/MATLAB. Compared with the existing method of wave head recognition of wavelet transform, it has obvious advantages. The results indicate that the proposed fault location method is effective and accurate.