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심정욱,임형우,차귀수,Sim, Jung-Wook,Lim, Hyoung-Woo,Cha, Guee-Soo 한국초전도저온공학회 2000 한국초전도저온공학회논문지 Vol.2 No.2
The high temperature superconducting bulk can be used as the rotor of an ac motor. This paper presents the fabrication and test results of a ac motor with HTS bulk rotor. The rotor of a conventional squirrel cage induction motor was replaced with cylinder type YBCO bulk. Height and outer diameter of the HTS bulk was 15mm and 46mm, respectively. Eddy current brake using aluminium disk was used to measure the torque of the HTS motor. No load test, locked rotor test and load test were performed to examine the characteristics of the HTS motor. Test results show the motor can rotate at synchronous speed without any special starting circuit. Maximum output power of the constructed HTS motor was 408W.
YBCO 박막을 이용한 3상 6.6kV 항형 초전도 한류기의 동시Quench 분석
심정욱,김혜림,현옥배,Sim J,Kim H. R,Hyun O. B 한국초전도학회 2004 Progress in superconductivity Vol.6 No.1
We fabricated a resistive type superconducting fault current limiter (SFCL) of 3-phase $6.6 kV_{rms}$ / rating, based on YBCO thin films grown on sapphire substrates with a diameter off inch. Each element of the SFCL was designed to have the rated voltage of $600 V_{rms}$ $/35A_{rms}$. The elements produced a single phase with 8${\times}$6 components connected in series and parallel. In addition, a NiCr shunt resistor of 23 $\Omega$ was connected in parallel to each of them for simultaneous quenches between the elements. Prior to investigating the performance of the 3 phase SFCL, we examined the quench characteristics for 8 elements connected in series. For all elements, simultaneous quenches and equal voltage distribution within 10% deviation from the average were obtained. Based on these results, performance of the SFCL for single line-to-ground faults was investigated. The SFCL successfully limited the fault current of $10 kA_{ rms}$ below 816 $A_{peak}$ within 0.12 msec right after the fault occurred. During the quench process, average temperature of all components did not exceed 250 K, and the SFCL was totally safe during the whole operation.
현옥배,김혜림,임성우,심정욱,박권배,오일성,Hyun, O.B.,Kim, H.R.,Yim, Y.S.,Sim, J.,Park, K.B.,Oh, I.S. 한국초전도학회 2008 Progress in superconductivity Vol.10 No.1
We present domestic efforts for superconducting fault current limiter (SFCL) application in the Korea Electric Power Corporation (KEPCO) grid and pending points at issue. KEPCO's decision to upgrade the 154 kV/22.9 kV main transformer from 60 MVA to 100 MVA cast a problem of high fault current in the 22.9 kV distribution lines. The grid planners supported adopting an SFCL to control the fault current. This environment friendly to SFCL application must be highly dependent upon the successful development of SFCL having specifications that domestic utility required. The required conditions are (1) small size of not greater than twice of 22.9 kV gas insulated switch-gear (GIS), (2) sustainability of current limitation without the line breaking by circuit breakers (CB) for maximum 1.5 seconds. Also, optionally, recommended is (3) the reclosing capability. Conventional resistive SFCLs do not meet (1) $\sim$ (3) all together. A hybrid SFCL is an excellent solution to meet the conditions. The hybrid SFCL consists of HTS SFCL components for fault detection and line commutation, a fast switch (FS) to break the primary path, and a limiter. This characteristic structure not only enables excellent current limiting performances and the reclosing capability, but also allows drastic reduction of HTS volume and small size of the cryostat, resulting in economic feasibility and compactness of the equipment. External current limiter also enables long term limitation since it is far less sensitive to heat generation than HTS. Semi-active operation is another advantage of the hybrid structure. We will discuss more pending points at issues such as maintenance-free long term operation, small size to accommodate the in-house substation, passive and active control, back-up plans, diagnosis, and so on.
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.
도시형자기부상철도 부상전자석의 안전성 확보를 위한 형식승인 기술기준 개발 방안
심정욱(Sim, Jung Wook),김상헌(Kim, Sang Hun),박진규(Park, Jin Kyu),조완수(Jo, Wan Su) 한국도시철도학회 2016 한국도시철도학회논문집 Vol.4 No.4
The type approval of railway supplies was introduced in accordance with the revision of the Railway Safety Law. Accordingly, type approval technical standards and testing specification development studies are in progress to secure the safety and reliability of domestic railway vehicles and supplies. Correspondingly, It is necessary to develop new technical standards and testing specification for urban maglev as a basis for incorporating urban maglev into urban railway areas. maglev car uses a floating driving system unlike a general railway type, it is necessary to develop the new technical standards and testing specification reflecting the inherent characteristics of urban maglev railway unlike general railway technology. Through this study, we analyze the technical requirements for the type approval of the maglev magnet and study a way for the development of the type approval technical standards.