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1×3행렬구조ㅡㄹ 갖는 매트릭스형 초전도 한류기의 자장유무에 따른 퀜치특성 분석
吳金坤(Kum-Gon Oh),趙鎔善(Yong-Sun Cho),崔孝祥(Hyo-Sang Choi) 대한전기학회 2008 전기학회논문지 P Vol.57 No.3
We investigated the quench characteristics accordance with increase of turns and applied voltage of matrix-type superconducting fault current limiter (SFCL) with 1×3 matrixes. The matrix-type SFCL consists of the trigger part to apply magnetic field and the current-limiting part to limit fault current. The fault current limiting characteristics according to the increase of magnetic field and applied voltage were nearly same. This is because the application of magnetic field hasnot an affect on total impedance of SFCL. When number of turns of reactor increased, the voltage difference between two superconducting units in the current-lirniting part according was decreased. The resistance difference generated in two superconducting units also was decreased. Therefore, we confirmed that the differences of critical behaviors between superconducting units by application of magnetic field were decreased. By this results, we could be decided the optimum number of turns of reactor to apply magnetic field.
초전도 한류소자의 병렬연결에 따른 자속구속형 초전도 한류기의 특성 분석
吳金坤(Kum-Gon Oh),鄭柄益(Byung-Ik Jung),崔孝祥(Hyo-Sang Choi) 대한전기학회 2008 전기학회논문지 P Vol.57 No.2
We investigated the operating characteristics of the flux-lock type superconducting fault current limiter(SFCL) with the parallel connection between the primary and secondary windings which are connected with two superconducting units in series. The parallel connection for current level increase of the flux-lock type SFCL is necessary to apply the SFCL into the power system.[1-7] The resistance generated in superconducting units was dependent upon the winding direction of the primary and the secondary coils, which can reduce the power burden. The resistance of the superconducting elements in the subtractive polarity winding is higher than that of the additive polarity winding. The fault current limiting effect of the subtractive polarity winding is better than that of the additive polarity winding. From this results, we confirmed that the power capacity of the flux-lock type SFCL could be increased by the parallel connection of the superconducting units.
전력계통의 지락사고에 대한 매트릭스형 초전도 한류기의 동작특성
오금곤(Kum-Gon Oh),조용선(Yong-Sun Cho),최효상(Hyo-Sang Choi),오성보(Seong-Bo Oh),김덕구(Deog-Goo Kim) 한국조명·전기설비학회 2009 조명·전기설비학회논문지 Vol.23 No.10
전력 계통 내에서 발생하는 과도한 고장전류의 억제를 위한 가장 이상적인 방안은 초전도 한류기이다. 초전도 한류기의 전력계통 적용을 위해 본 논문에서는 전력계통 내에서 발생하는 1선, 2선, 3선 지락사고를 모의하여 매트릭스형 초전도 한류기의 동작 특성 및 소비전력을 분석하였다. 모든 지락사고에 대해 매트릭스형 초전도 한류기는 사고 초기에는 85[%] 이상, 1주기 이후에는 95[%] 이상 고장전류를 제한시킬 수 있다는 것을 확인하였다. 또한 초전도 소자간의 임계특성의 차이를 줄여줌으로써 소비전력이 균등해진다는 것을 확인하였다. It is very important for power stability to suppress the excessive fault current happened frequently in the real power grid. The superconducting fault current limiter (SFCL) is one of the most effective ways to reduce the fault current among the facilities developed so far. In this paper, we have investigated the operating characteristics of the power grid with the SFCL according to three types such as the single, double and triple line-to-ground faults. In addition, we analyzed the consumption power of the superconducting units based on the working data of the SFCL. We confirmed that the fault current could be limited lower than its peak value to 85 percentage in initial fault condition and to 95 percentage after one cycle in the matrix-type SFCL. The consumption powers of the superconducting units were almost equal by reduction of the difference of the critical current between superconducting units element.
전압증가에 따른 자속구속형 초전도 한류기의 전류제한 및 회복특성 분석
최효상,오금곤,한태희,조용선,최명호,한영희,성태현,Oh, Kum-Gon,Han, Tae-Hee,Cho, Yong-Sun,Cho, Hyo-Sang,Choi, Myoung-Ho,Han, Young-Hee,Sung, Tae-Hyun 한국조명전기설비학회 2007 조명·전기설비학회논문지 Vol.21 No.8
자속구속형 초전도 한류기는 1차 권선과 초전도 소자가 직렬로 연결된 2차 권선을 갖는 변압기로 구성되어 있다. 이 초전도 한류기는 결선방향에 따라 감.가극 결선으로 나누어진다. 1차 권선과 2차 권선의 인덕턴스 비에 따라 자속구속형 초전도 한류기는 사고전류의 제한특성을 제어할 수 있다. 본 논문에서는 인가전압에 따른 자속구속형 초전도 한류기의 전압 전류 특성을 분석하였다. 감 가극 결선된 자속구속형 초전도 한류기의 인가전압을 증가시켰을 때, 초기에 제한되는 전류 및 초전도 소자의 ??치 시간은 증가하였다. 초전도 소자의 회복시간은 인가전압이 증가함에 따라 증가하였다. 그러므로 자속구속형 초전도 한류기의 회복특성은 초전도 소자의 소비전력이 증가하기 때문에 초전도 소자에서 소비되는 에너지에 크게 의존한다는 것을 확인할 수 있었다. The flux-lock type SFCL consists of transformer with primary and secondary windings connected to a superconducting element in serial. It can be divided into the subtractive and the additive polarity windings according to the winding direction. It could change the fault current limiting characteristics according to the inductance ratio between the coil 1 and coil 2. We investigated the voltage-current characteristics of the flux-lock type SFCL according to the increment of applied voltage. When the applied voltage of the SFCL with the subtractive and the additive polarity windings was increased a initial limiting current ($I_{ini}$) and the quench time of the superconducting element were increased. The recovery time of the superconducting element was increased by increment of applied voltage. Therefore, it was confirmed that recovery characteristics in the flux-lock type SFCL were largely dependent on the consumed energy of a superconducting element because of increment of the consumption power into the superconducting element.
김아현(A-Hyun Kim),최상일(Sang-il Choi),김영수(Young-Su Kim),오금곤(Kum-Gon Oh),김영동(Young-Dong Kim) 전력전자학회 2004 전력전자학술대회 논문집 Vol.- No.-
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정병익(Byung-Ik Jung),최효상(Hyo-Sang Choi),조용선(Yong-Sun Cho),이주형(Joo-Hyoung Lee),정수복(Su-Bok Jung),오금곤(Kum-Gon Oh) 한국조명·전기설비학회 2008 한국조명·전기설비학회 학술대회논문집 Vol.2008 No.10월
We investigated a flux-coupling type superconducting fault current(SFCL) limiter. The SFCL consisted of the primary and secondary coils, which were wound in series each other through an iron core. Superconducting unit was connected with secondary coil in parallel. The flux generated from a coil in normal operation is cancelled out by its structure and the zero resistance of the superconducting unit. In this paper, In order to compare the current limiting effects of the SFCL by applied voltage. When applied voltage was increased, quench time was shortened. Fast quench time is important component under the same fault condition because power burden of the SFCL is reduced by that of the superconducting units. The current limiting behavior of flux-coupling type SFCL was dependent upon the applied voltage.
삼상 자속결합형 초전도 한류기의 재폐로 동작 특성 분석
정병익(Byung-Ik Jnng),최효상(Hyo-Sang Choi),박형민(Hyoung-Min Park),조용선(Yong-Sun Cho),하경훈(Kyoung-Hun Ha),최수근(Soo-Geun Choi),오금곤(Kum-Gon Oh),김덕구(Duck-Gu Kim) 대한전기학회 2010 대한전기학회 학술대회 논문집 Vol.2010 No.7
본 논문은 자속결합형 초전도 한류기의 삼상 계통에서의 재폐로 동작특성 및 사고전류 제한특성을 분석하였다. 자속결합형 초전도 한류기의 재폐로 동작특성을 확인하기위해 3번의 사고를 연속해서 모의 하였다. 그 결과 연속된 사고 조건하에서 모두 사고전류를 정상적으로 제한하는 것을 확인할 수 있었다. 이것은 본 초전도 한류기가 사고가 끝난 후 수 밀리초 이내에 바로 초전도 상태로 회복되었다는 것을 보여준다. 이것은 계통적용에 있어 사고가 제거된 후 정상 전류가 유입되었을 때 초전도 한류기로 인한 손실 없이 재 동작 할 수 있다는 것을 나타낸다.