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Description
In this paper, the DC superconducting fault current limiting circuit breaker (SFCL-CB) with Adjustable Current Limiting Reactor was suggested and its fault current limiting characteristics was analyzed. The proposed DC SFCL-CB consists of two mechanical switches (SW), a magnetically coupled CLR and two superconducting elements(SC). In case that DC fault current occurs, the first superconducting element quenches, which can limit DC transient fault current due to its resistance generation. Depending on the adjustable CLR coupling method, the quench occurrence of the second superconducting element makes the mechanical switch open. Through the experimental analysis, it was verified that the DC SFCL-CB, in case of the current limiting reactor designed by subtractive polarity winding, could enhance DC fault current limiting and interrupting characteristics.
