Use of Mexican Hat Wavelet for Detection and Localization of Faults in Transmission Lines

To transmit the electrical power from utility to end-user the power transmission and distribution lines plays an important role. They are the vital links that accomplish the indispensable (essential) continuity of service. As we know that the generating stations are located far away from the end-users and they run the distance over hundreds of kilometers, this leads to rise the probability of occurrence of fault in the transmission line. Since faults affect the power system, so it is necessary to isolated it immediately. Fault analysis is very important factor in power system engineer to maintain the system stability and in order to return the system in normal operating condition with minimum interruptions. In case of the digital distance protection schemes signal processing is an important key. The proposed model is based upon a combination of the impedance calculation and the continuous wavelet transformation (CWT) method. This method also detect the disturbances occurs in the transmission line with distance of fault occurrence. In order to verify the algorithm and to create fault signals MATLAB / Simulink is used. Simulation results show that the performance of the proposed fault detection indicator.