Analysis on Magnetizing Characteristics Due to Peak Fault Current Limiting Operation of a Modified Flux-Lock-Type SFCL With Two Magnetic Paths

초록

The advantage of the flux-lock-type superconducting fault current limiter (SFCL) is that the operational current of the SFCL can be easily adjusted by the winding ratio and the winding direction between two windings. Furthermore, the peak fault current limiting operation according to the transient initial fault current was reported to be performed by adding the third winding and another superconducting element into the flux-lock-type SFCL with either one or two magnetic paths. In this paper, the magnetizing characteristics of the modified flux-lock-type SFCL, due to its peak fault current limiting operation, which another superconducting element and the third winding were added into the E-I iron core structure with two magnetic paths, were analyzed. To analyze the dependence of its magnetizing characteristics on the peak fault current limiting operation of the SFCL, the peak fault current limiting tests of the SFCL due to the fault angle were carried out. With the measured voltage and the current values, the flux linkage and the magnetization current derived from the equivalent magnetization circuit were calculated and compared, at each fault angle, together with the magnetizing power related with the accumulated magnetic energy in the iron core during the fault period.

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