Proceedings of the KIEE Conference (대한전기학회:학술대회논문집)
- 2004.11d
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- Pages.93-96
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- 2004
The Fault Current Limiting Characteristics According to Increase of Voltage in a Flux-Lock Type High-Tc Superconducting Fault Current Limiter
전압 증가에 따른 자속구속형 고온 초전도 전류제한기의 사고전류 제한 특성
- Cho, Yong-Sun (Chosun Uni) ;
- Park, Hyoung-Min (Chosun Uni) ;
- Lim, Sung-Hun (Chonbuk National Uni) ;
- Park, Chung-Ryul (Chonbuk National Uni) ;
- Han, Byoung-Sung (Chonbuk National Uni) ;
- Choi, Hyo-Sang (Chosun Uni) ;
- Hyun, Ok-Bae (KEPRI) ;
- Hwang, Jong-Sung (Jeonnam Provincial collage)
- 조용선 (조선대학교 전기공학과) ;
- 박형민 (조선대학교 전기공학과) ;
- 임성훈 (전북대학교 전기공학과) ;
- 박충렬 (전북대학교 전기공학과) ;
- 한병성 (전북대학교 전기공학과) ;
- 최효상 (조선대학교 전기공학과) ;
- 현옥배 (한국전력연구원) ;
- 황종선 (남도대학교)
- Published : 2004.11.12
Abstract
In this paper, we analyzed the current limiting characteristics according to increase of source voltage in the flux-lock type high-Tc superconducting fault current limiter (SFCL). The flux-lock type SFCL consisted of two coils, which were wound in parallel each other through an iron core, and high-Tc superconducting (HTSC) element connected with coil 2 in series. The flux-lock type SFCL has the characteristics better in comparison with the resistive type SFCL because the fault current in the flux-lock type SFCL can be divided into two coils by the inductance ratio of coil 1 and coil 2. The fault current limiting operation of the flux-lock type SFCL can be different due to winding direction of the two coils. The winding method where the decrease of linkage flux between two coils in the accident happens is called the subtractive polarity winding and the winding method in case of the increase of linkage flux is called the additive polarity winding. The fault current limiting experiments according to the source voltage were performed for these two winding methods. Through the comparison and the analysis of the experimental data, we confirmed that the quench time was shorter, irrespective of the winding direction as the source voltage increased and that the fault current and the HTSC's resistance increased as the amplitude of the source voltage increased. The additive polarity winding made the fast quench time and the lower resistance of HTSC element in comparison with the subtractive polarity winding. The fault current of the subtractive polarity winding was larger than that of the additive polarity winding. In conclusion, we found that the additive polarity winding reduced the burden of SFCL because the quench time was shorter and the fault current was smaller than those of the subtractive polarity winding.
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