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Operational Behaviors of Flux-Coupling Type SFCL Using Integrated Three Phase Transformer Under Transient State

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4 Author(s)
Kyoung-Hun Ha ; Dept. of Electr. Eng., Chosun Univ., Gwangju, South Korea ; Soo-Geun Choi ; Yong-Sun Cho ; Hyo-Sang Choi

A superconducting fault current limiter (SFCL) has been proposed as an efficient method to protect a power grid from fault current. For applying a SFCL to the power grid, the various ways to increase the capacity of a SFCL should be researched in advance. Thus, the study on SFCL using a transformer has been performed. In this paper, we analyzed operational behaviors of integrated three-phase flux-coupling type SFCL under transient states in the power grid. When single and double line-to-ground fault occurred, all superconducting elements of sound and fault phase were quenched unlike segregated type SFCL. The fault current was limited by mutual supplementing in the all phases. As a result, the limited rate of fault current was small, even though the applied voltage was increased. It means this type SFCL limited the fault current efficiently by sharing of magnetic flux.

Published in:

Applied Superconductivity, IEEE Transactions on  (Volume:22 ,  Issue: 3 )