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YBCO 박막형 초전도 한류소자의 ?치 회복 특성에 관한 연구
임성우(Seong-Woo Yim),심정욱(Jungwook Sim),김혜림(Hye-Rim Kim),현옥배(Ok-Bae Hyun),김호민(Ho-Min Kim),박권배(Kwon-Bae Park),이방욱(Bang-Wook Lee),오일성(Il-Sung Oh) 대한전기학회 2006 대한전기학회 학술대회 논문집 Vol.2006 No.7
For the application of superconducting fault current limiters (SFCLs) to the protection system, quench recovery characteristics of Au/YBCO thin film were investigated. The Au/YBCO thin film was designed as a SFCL element with a bi-spiral pattern. The SFCL element limited the fault current successfully. For the analysis of the recovery to superconducting state, we measured resistance variation of the SFCL element after the quench. In addition, in order to investigate the dependence of quench characteristics of SFCL on the LN₂ cooling condition, we measured the recovery time under a pressure of 1, 2 and 3 atm. As the results, the recovery time increased in proportion to the duration of the fault currents. In the sub-cooled condition, while the quench development was exactly the same, the recovery time was shortened as the pressure increased.
실증시험용 배전급 초전도 한류기의 특성 평가 및 운전 시험
임성우(Seong-Woo Yim),박충렬(Chung-Ryul Park),유승덕(Seung-Duck Yu),김혜림(Hye-Rim Kim),현옥배(Ok-Bae Hyun),박권배(Kwon-Bae Park),심정욱(Jungwook Sim),이경호(Kyoung-Ho Lee),오일성(Ill-Sung Oh) 대한전기학회 2009 대한전기학회 학술대회 논문집 Vol.2009 No.7
Superconducting fault current limiter (SFCL) is an power device of a novel concept. While SFCLs generate no ohmic loss during the operation carrying normal currents, they can limit fault currents very fast making large impedance by their quench characteristics. In 2006, KEPCO has developed a distribution class hybrid type SFCL by a collaborative research project with LS industrial systems. The SFCL has merits in practical and economical points of view. In the SFCL, the superconductor just plays a role of a fault detector and the current limiting is completed by the other current limiting element made of normal metals throu호 the line commutation. As a result, the required amounts of superconductors can be reduced considerably. Consequently, the hybrid SFCL can be fabricated with small size and cost, maintaining perfect current limiting performance. Currently, KEPCO is carrying out a research project at Gochang power test center for the purpose of the verification test of the 22.9 ㎸/ 630 A class SFCL for the practical application in real grid. Through the project, a long term operational test and fault current test will be done. In this paper, the back ground of development and installation of the SFCL will be explained and the operation plan of the SFCL for the verification test is also introduced.