Fuzzy logic technique based single phase auto-reclosing protection system of a double circuit transmission line

The presented paper investigates a new design of an adaptive single phase auto reclosing (ASPAR) single scheme using fuzzy logic (FL) algorithm to maintain synchronism and improvement of the power system reliability, integrity and stability. The suggested auto-reclosure system has been incorporated with distance measuring relay (DMR) to detect and diagnose fault occurrence. The proposed fault classification method, including fuzzy logic, router circuits, logic gates and timers, is able to precisely identify fault type depend on the angular difference of a positive and negative sequence analyzer value and coordination. The blocking signals of fuzzy fault classifier is used adaptively to recognize unclassified tripping signals of the conventional protection relay and correspond a trained signals to single phase auto-reclosure. The designed ASPAR with FL method has been modeled and tested with the double circuit overhead transmission line using MATLAB\SIMULINK. The simulation results describe FL performance and feasibly to discriminate among different types of faults and to provide a tripping and reclosing pulses for the appropriate poles of the multi-shot single pole circuit breaker with successful mechanism at transient faults and lockout case in permanent fault as well.