Fault Location and Distance Estimation on Power Transmission Lines using Discrete Wavelet Transform
Sunusi. Sani Adamu1, Sada Iliya2
1Department of Electrical Engineering, Faculty of Technology, Bayero University Kano, Nigeria
2Department of Electrical Engineering, College of Engineering, Hassan Usman Katsina Polytechnic
Fault location is very important in power system engineering in order to clear fault quickly and restore power supply as soon as possible with minimum interruption. In this study a 300km, 330kv, 50Hz power transmission line model was developed and simulated using power system block set of MATLAB to obtain fault current waveforms. The waveforms were analysed using the Discrete Wavelet Transform (DWT) toolbox by selecting suitable wavelet family to obtain the pre-fault and post-fault coefficients for estimating the fault distance. This was achieved by adding non negative values of the coefficients after subtracting the pre-fault coefficients from the post-fault coefficients. It was found that better results of the distance estimation, were achieved using Daubechies ‘db5’wavele,t with an error of three percent (3%).