DIRECTIONAL OVERCURRENT RELAY USING SUPERCONDUCTING FAULT CURRENT LIMITER VOLTAGE AND METHOD FOR CORRECTING THE SAME

摘要

Provided is a directional overcurrent relay using a superconducting fault current limiter voltage as a relay element, and a method for correcting the same. The directional overcurrent relay using a superconducting fault current limiter voltage as a relay element includes: a current measuring circuit measuring a current of a line connected from a system power source to a load, a voltage measuring circuit measuring a voltage at both ends of a superconducting fault current limiter connected to the line, and a correcting circuit correcting a tripping time T_trip by using a fault current I_f that is the current of the line and a superconducting fault current limiter voltage V_SFCL that is the voltage at both ends of the superconducting fault current limiter and the tripping time T_trip is maintained consistently regardless of whether the superconducting fault current limiter operates or not.