A New Technique for High Resistance Fault Detection during Power Swing for Distance Relay

Contingencies in power system caused oscillation in rotor angle which leads to power swing. In the case of power swing, distance relay is designed to block the operation to avoid wrong operation of relay. However, this blocking scheme proves to vulnerable as it could block the trip signals when a fault occurs during power swing. Hence, it is desired to develop the proper fault detection technique to avoid such circumstances. This paper presents a new fault detection technique during power swing based on S-Transform. To ascertain validity of the proposed scheme, it was verified with the IEEE 14 bus test system and simulations results show that the proposed technique can detect fault occurring during power swing.