Fuzzy Logic Based Protection Scheme for Symmetrical and Unsymmetrical Faults in Three Phase Series Compensated Transmission Line

The electricity is the basic need of living nowadays. The reliable supply is essential to satisfy the reliable operation of electricity. This paper presents the fuzzy logic based protection scheme for detection and classification of shunt faults in a three phase series compensated transmission line. A 735 kV, 60 Hz series compensated three phase single circuit transmission lines has been simulated using simulink and simpowersystems toolbox of MATLAB software. The proposed method is based on the fundamental component of voltage measurement of each phase which is provided as input to the fuzzy logic based fault detector and classifier. The proposed scheme has been tested with different symmetrical and unsymmetrical fault cases with variation in fault location, fault resistance and fault inception angle. Based on the simulation results it has been found that the proposed fuzzy logic based protection system detects and classifies both symmetrical and unsymmetrical shunt faults correctly.