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22.9㎸ 중성점 다중접지계통에 CD형 초전도케이블을 적용한 경우의 지락전류변화
李宗培(Jong-Bae LEE),黃時乭(Si-Dole Hwang),孫松縞(Song-Ho Sohn),李根準(Geun-Joon LEE) 대한전기학회 2007 전기학회논문지 Vol.56 No.6
This paper discusses the effects of CD type superconducting cable operation in 22.9㎸ multi neutral grounded distribution system during L-G fault and counterplans to power system protection. In case of using the 3-phase CD-type superconducting cable, the inductance of superconducting cable system would be decreased due to the current of shield part of superconducting cable, which is opposite direction and nearly equal value with respect to main superconductor. However, when the shield circuit system is operated in shorted state, shield current decreases faulted ground current and give effects to power system protection scheme. This study examines the phenomena of single line to ground fault case in above mentioned system using the EMTDC program and discusses the right operation method of superconducting shield.
최효상,현옥배,김혜림,황시돌,Choi, Hyo-Sang,Hyun, Ok-Bae,Kim, Hye-Rim,Hwang, Si-Dole 한국초전도저온공학회 2000 한국초전도저온공학회논문지 Vol.2 No.2
We fabricated a resistive superconducting fault current limiter (SFCL) of meander type based on a YBCO film. In order to disperse the heat generated at hot spots in the YBCO film the film was coated with a gold shunt layer. When diodes were inserted in the parallel circuit to restrict the temperature increase in the SFCL element by reducing power supply cycles, the voltage could be increased to $\sqrt{2}$ times with the same quench resistance at a half and full cycles.
단층 초전도케이블 샘플에서 교류손실의 수치해석에 대한 연구
이주영,마용호,류경우,황시돌,Li, Zhu-Yong,Ma, Yong-Hu,Ryu, Kyung-Woo,Hwang, Si-Dole 한국전기전자재료학회 2009 전기전자재료학회논문지 Vol.22 No.7
AC loss is one of the important factors for commercialization of a high temperature superconducting (HTS) cable from an economic point of view. But AC loss characteristics of the HTS-cable are not elucidated completely because of its complex structure. As an earlier stage of analyzing the AC loss in the 22.9 kV/50 MVA, 100m HTS-cable system of Korea Electric Power Corporation (KEPCO) which is now in collaboration with us, a two-dimensional (2D) numerical model, which takes into account the nonlinear conductivity properties of a high temperature superconductor, has been developed. In order to examine our 2D model, we have prepared several single-layer cable samples whose AC losses are sufficiently reliable due to their simple structure. The AC losses of the samples were experimentally investigated and then compared with our 2D model. The results show that the numerically calculated AC losses are not in good agreement with the measured ones for the cylindrical cable and deca-cable samples with low critical current density. However, the numerically calculated and measured AC losses are relatively in good agreement for the deca-cable and hex-cable samples with high critical current density, although the difference between these two loss data in the deca-cable sample tends to increase in the low current region.