Application of Discrete Wavelet Transforms for fault location on transmission network systems

This paper proposes a technique to identify locations of fault along the transmission network systems using Discrete Wavelet Transforms (DWT). The maximum coefficients of the positive sequence current obtained from all buses are compared in order to detect the faulty bus on a transmission network and the first peak times obtained from the faulty bus are used as an input data for travelling wave equation. The proposed method gives a satisfactory accuracy, and will be very useful in the development of a modern protection scheme for electrical power transmission network systems.