Current Limiting Characteristics of Transformer Type Superconducting Fault Current Limiter With Shunt Impedance

The transformer type superconducting fault current limiter is one of the fault current limiters which have been proposed to reduce the fault currents in power transmission lines. In this paper, the use of shunt impedance is proposed in order to adjust the amplitude of the fault current and satisfy the required condition as a protective device. The current limiting performance of the transformer type superconducting fault current limiters with the shunt impedance is analysed theoretically. The current limiting performances with inductive shunt and with resistive shunt are compared. The experimental results obtained by using a 5 kVA-class experimental fault current limiter are shown to justify the theoretical analyses.