| Title |
Study on Improving Complex Relaying Performance for SFCL Applied in Transmission Line Protection |
| Authors |
김명현(Myong-Hyon Kim) ; 김진석(Jin-Seok Kim) |
| DOI |
https://doi.org/10.5370/KIEE.2025.74.3.523 |
| Keywords |
Protection relay; Superconducting fault current limiter; Distance Relay; Back-up protection |
| Abstract |
In this paper, we identified a problem in which distance relays did not operate properly near the boundary of the protection zone due to the impedance of the SFCL(superconducting fault current limiter) when a fault occurred in a transmission line. As a solution to this problem, we proposed a composite relaying method that utilizes the operation status of the superconducting fault current limiter. The operation of the superconducting fault current limiter means a fault, it was judged that a relaying method utilizing the operation of the superconducting current limiter would be appropriate. In addition, a method considering fault current was proposed to increase the reliability of the proposed method due to the failure of the SFCL itself. As a result of performing fault detection using the proposed method, it was shown that effective fault detection was possible based on the operation of the superconducting current limiter even when the under reach occurred near the boundary of the protection zone of the distance. |