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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.