The Application of Discrete Wavelet Transform to Classification of Power Transmission System Faults

This paper presents the development of detection and classification system for the various faults in power system to enhance the selectivity of power system protection and avoid considerable damages that happen as a result of inadequate protection. The aim is to make a classification of any fault that occurs in any power system as fast as possible. This diagnosis improves the relaying speed of the digital (numerical) distance relay to isolate the faulty part and reported immediately to the system operators simultaneously with other information; to estimate and reduce the repair time.. Before the classifier design goes to the manufacturing stage, it is quite necessary to test and verify its performance through modeling and simulations. Discrete wavelet transform is adopted to transform the fault signals in such a way it can be translated to indicate the fault type. The program is prepared as MATLAB script and evaluated through simulations of the transmission line model by MATLAB/SIMULINK that lead to promising results.