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배전급 초전도 한류기 개발을 위한 Bi-2212 초전도 한류소자의 사고전류 제한 특성
沈政煜(Jungwook Sim),李海根(Haigun Lee),任星禹(Sung-Woo Yim),金惠林(Hye-Rim Kim),玄鈺培(Ok-Bae Hyun),朴權培(Kwon Bae Park),李昉昱(Bang Wook Lee),吳一成(Il-sung Oh),金鎬民(Ho Min Kim) 대한전기학회 2007 전기학회논문지 Vol.56 No.2
We investigated fault current limitation characteristics of the resistive superconducting fault current limiter (SFCL) which consisted of a Bi-2212 bulk coil and a shunt coil. The Bi-2212 bulk coil and the shunt coil were connected in parallel. The Bi-2212 bulk coil was placed inside the shunt coil to induce field-assisted quench. The fault test was conducted at an input voltage of 200 Vrms and fault current of 12 ㎄rms and 25 ㎄rms. The fault conditions were asymmetric and symmetric, and the fault period was 5 cycles. The test results show that the SFCL successfully limited the fault current of 12 ㎄rms and 25 ㎄rms to below 5.5 ~ 6.9 ㎄peak within 0.64 ~ 2.17 msec after the fault occurred. Limitation was faster under symmetric fault test condition due to the larger change rate of current. We concluded that the speed of fault current limitation was determined by the speed of current rise rather than the amplitude of a short circuit current. These results show that the Bi-2212 bulk coil is suitable for distribution-class SFCLs.
崔在亨(Jae-Hyeong Choi),崔眞郁(Jin-Wook Choi),李海根(Haigun Lee),宋廷彬(Jung-Bin Song),金海鍾(Hae-Jong Kim),成耆哲(Ki-Chul Seong),金相賢(Sang-Hyun Kim) 대한전기학회 2009 전기학회논문지 Vol.58 No.1
Recently, for improvement of the magnetic field of high temperature superconductor (HTS) apparatus, many studies investigating on operating in the range of 20 - 65 K with liquid helium or the conducting method using cryocooler are actively reviewed. Also, the cooling method using solid nitrogen as cryogen is being suggested. Since the nitrogen has very large specific heat in solid state, it is expected that it can be operated for a long time without a continuous supply of cooling energy. However, there are still insufficient data on the characteristics of solid nitrogen such as thermodynamic properties and liquid-solid phase change. Especially, there was almost no study done on the electrical insulation properties of solid nitrogen so far. In this study, solid nitrogen to find the electrical characteristics was made by using cryocooler and cryostat, and investigated the flashover discharge and breakdown. The results of this study will be useful as a basic data for electrical insulation design of the HTS system using solid nitrogen as cryogen.
배전급 초전도 한류기 개발을 위한 Bi-2212 초전도 한류소자의 사고전류 제한 특성
심정욱(Jungwook Sim),김혜림(Hye-Rim Kim),임성우(Seong-Woo Yim),현옥배(Ok-Bae Hyun),이해근(Haigun Lee),박권배(Kwon-Bae Park),김호민(Ho Min Kim),이방욱(Bang-Wook Lee),오일성(Il-Sung Oh),Frank Breuer,Joachim Bock 대한전기학회 2006 대한전기학회 학술대회 논문집 Vol.2006 No.7
We investigated fault current limitation characteristics of the resistive superconducting fault current limiter (SFCL) which consisted of a Bi-2212 bulk coil and a shunt coil. The Bi-2212 bulk coil and the shunt coil were connected in parallel. The Bi-2212 bulk coil was placed inside the shunt coil to induce field-assisted quench. The fault test was conducted at an input voltage of 200 V<SUB>rms</SUB> and fault current of 12 ㎄<SUB>rms</SUB> and 25 ㎄<SUB>rms</SUB>. The fault conditions were asymmetric and symmetric, and the fault period was 5 cycles. The test results show that the SFCL successfully limited the fault current of 12 ㎄<SUB>rms</SUB> and 25 ㎄<SUB>rms</SUB> to below 5.5 ~ 6.9 ㎄<SUB>peak</SUB> within 0.64 ~ 2.17 msec after the fault occurred. Limitation was faster under symmetric fault test condition due to the larger change rate of current. We concluded that the speed of fault current limitation was determined by the speed of current rise rather than the amplitude of a short circuit current. These results show that the Bi-2212 bulk coil is suitable for distribution-class SFCLs.