Development and Long-Term Test of a Compact 154-kV SFCL

A compact 154-kV superconducting fault current limiters (SFCL) system has been developed by Korea Electric Power Corporation and led to a primary prototype being tested for three months at Gochang Power Test Center. Due to the fact that the volume of the primary model was still relatively large for application to substations, a compact system was designed. To reduce the volume of the SFCL system, electric field analyses were performed. By carrying out a fine modification of the shape, the design of a compact system was completed, and the volume and footprint of the compact cryostat were 65% and 77% of the primary model, respectively. Following that, a single-phase compact model was fabricated and installed on a dedicated test site at Gochang Power Test Center. Several tests were then performed on the SFCL system, which led to a single-phase voltage of 154 kV being applied to the system. The period covered by the long-term test lasted for one year. This paper presents the results of the one-year testing.