An improved fault area detection & fault location methodology using wavelet transform

Abstract

This paper presents wavelet transform based analysis to determine whether a fault has occurred at near end or far end with respect to a reference bus and thus facilitates the calculation of fault location based on the lattice diagram of the travelling wave phenomenon in transmission line. Faults in power transmission lines cause transients that travel at the speed of light and propagate along the line as travelling wave. The fault is generated in a simple two bus system within the MATLAB Simulink program. Clarke's transform has been applied to convert the fault current into their modal components. Aerial mode is only applied in the analysis. Daubechies4 wavelet transform has been applied to decompose the Aerial mode into Scale 1 and Scale 2 wavelet coefficient.