A comparison between different approaches for fault classification in transmission lines

This paper presents a comparison between different approaches for fault classification in transmission lines. Fault classification is necessary for reliable and high speed protective relaying followed by digital distance protection. Three fault classification techniques are presented for comparison in terms of complexity and time. Firstly, based on evaluation of symmetrical components of fault currents, Secondly by applying wavelet transform on fault voltages and currents subsequently followed by energy computation and thirdly, after modal transformation signal decomposition is performed to determine the energy densities for fault classification. The fault data for various fault locations and fault inception angles is obtained by simulating the power system in MATLAB/SIMULINK. The results show that the last algorithm provides a fast fault classification with adaptive window programming feature.