Hysteresis Characteristics Analysis of a Flux-coupling type Superconducting Fault Current Limiter

Superconducting fault current limiter (SFCL) is one of the effective ways to solve the problem of excessive short-circuit current in power system. A flux-coupling type SFCL (FC-SFCL) is developed in this paper. Sometimes, an iron core is inserted in the current-limiting unit of the FC-SFCL to improve the current-limiting inductance. Considering the influence of the core hysteresis effect on the current-limiting characteristics and operating process of the limiter, a calculation method for the operating state of the FC-SFCL combined with MATLAB + COMSOL is proposed. The results can provide theoretical guidance for effectively suppressing or solving the hysteresis problem of the limiter.