Experimental Analysis of Flux-Coupling-Type Superconducting Fault Current Limiter Prototypes

The development of power system has increased the level of short-circuit fault current, and flux-coupling-type superconducting fault current limiter can effectively limit short-circuit current by the increased impedance after decoupling of windings. In this paper, two prototypes of pancake-winding and layer-winding were manufactured and experiments were conducted. The results show that the current-limiting ratio of two prototypes reached more than 40%. Analysis of the control strategy indicates that two breakers of the limiter could operate at the same time or at different times, and when two breakers operated asynchronously, there would be a damping direct current in the windings. When decoupled, two prototypes had coil voltage distributions of increase and then fall off, and pancake-winding had a intercoil voltage distribution of sawtooth.