Soongsil University

Sung Hun Lim

Jin Seok Kim

Jae Chul Kim

Seung Taek Lim

A 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 Tby using a fault current Ithat is the current of the line and a superconducting fault current limiter voltage Vthat is the voltage at both ends of the superconducting fault current limiter and the tripping time Tis maintained consistently regardless of whether the superconducting fault current limiter operates or not.

Directional overcurrent relay using superconducting fault current limiter voltage and method for correcting the same

A current limiting device is provided. To elaborate, the device may include: a first current limiting unit configured to limit an electric current equal to or higher than a first threshold value applied thereto; a second current limiting unit configured to limit an electric current equal to or higher than a second threshold value applied thereto; and a passive element unit connected to both ends of the first current limiting unit, and including a first passive element and a second passive element connected in series.

Growing community of inventors

Seoul, South Korea

Sung Hun Lim