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YBCO Coated Conductor의 과전류 특성해석
이찬주(C. Lee),남관우(K. Nam),강형구(H. Kang),고태국(T. K. Ko),석복렬(B. Y. Seok) 대한전기학회 2006 대한전기학회 학술대회 논문집 Vol.2006 No.7
In order to develop a high temperature superconducting(HTS) coil for the fault current limiter(FCL), the over-current characteristics in YBCO coated conductor(CC) with Ni-W alloy substrate are analyzed. The HTS wire is wound by bifilar winding method for resistive current limitation and it is operated in 65K sub-cooled nitrogen. In order to analyze the resistance and the temperature characteristics of the CC wire, an analysis program is developed considering all the composition materials except the buffer layer. Using this program, the temperature rise, the resistance development and the current limitation of CC are calculated depending on the applied voltage and the stabilizer materials. According to the analysis results, under the temperature restriction of 300K, the maximum voltage per meter is determined as 40V/m if the stabilizer is 25㎛ thick stainless steel at each side. Finally, the wire length needed for the distribution level HTS FCL is estimated.
석복렬(B. Y. Seok),강형구(H. Kang),이찬주(C. Lee),남관우(K. Nam),고태국(T. K. Ko) 대한전기학회 2006 대한전기학회 학술대회 논문집 Vol.2006 No.7
In this study, superconducting coil arrangements and cryostat concept design were conducted for the development of 13.2㎸/630A bifilar winding type high temperature superconducting(HTS) fault current limiter(FCL) with YBCO coated conductor(CC) wire. The coil consists of several layers with unique non-inductive solenoid winding method. Six types of HTS coil arrangements were investigated for the optimal insulation design of HTS FCL. And, conceptual design of cryostat was conducted for the decrement of thermal invasion and the prevention of low voltage insulation breakdown in the LHe which is used as pressurization gas in sub-cooling condition of liquid nitrogen(LN2). As the results, it was found that the modified suspended type cryostat with horizontal coil arrangement is beneficial to the insulation design of 13.2㎸ level bifilar winding type HTS FCL.