자속구속형 초전도한류기의 과도고장전류제한 특성 및 변압기 순시전력 부담 분석

초록

In this paper, we proposed a flux-lock type superconducting fault current limiter (SFCL) with a transformer winding as a way to avoid the direct conduction of fault current into the superconducting element, which was designed to make the superconducting element comprising the SFCL separated from the fault current. Through the short-circuit simulation, we analyzed the transient fault current limiting characteristics of a flux-lock type SFCL with a transformer winding and the instantaneous power load characteristics of the transformer. In case that the transformer turns’ ratio between the primary and secondary windings is 0.5, the instantaneous power loads in both the superconducting element and the transformer were confirmed to be much larger rather than 0.25. On the other hand, the peak fault current limiting characteristics of the flux-lock type SFCL, in case that the turns’ ratio of the transformer is a 0.25, were shown to be more excellent than the case with 0.5.

키워드