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남긍현,이나영,최효상,조금배,Nam, Gueng-Hyun,Lee, Na-Young,Choi, Hyo-Sang,Cho, Guem-Bae 한국조명전기설비학회 2006 조명·전기설비학회논문지 Vol.20 No.7
초전도전류제한기(SFCL)는 전력계통내 적용시 계통보호를 보다 향상시킬 수 있는 방안으로써 수초이내에 신속하게 사고전류를 제한한다. 이러한 SFCL중 자속구속형 전류제한기의 설계구조는 자속구속리액터인 하나의 철심에 1차측과 2차측 코일이 병렬로 결선되어 있다. 또한 전류제한소자인 YBCO박막과 2차측 코일을 직렬로 결선하여 설치장소의 조건에 따라 인덕턴스와 2차측 코일의 극성방향으로 과도전류 크기를 조절할 수 있다. 이러한 동작특성은 철심을 자속매개체로 적용되기 때문에 철심조건에 따른 성능평가실험은 필수적이다. 가극결선에서 전원전압을 200[Vrms] 인가시 피크전류는 폐루프가 30.71[A], 개루프가 32.01[A]까지 상승됨에 따라 초기과도 응답특성은 폐루프가 유리하였다. 하지만, 소자에 발생되는 전압이 폐루프가 220.14[V], 개루프가 142.73[V]까지 상승함에 따라, 폐루프 철심구조시 전류제한소자의 부담이 가중됨을 알 수 있었다. 결과적으로 자속구속형 SFCL의 전력계통내 적용 시 각각의 철심구조에 따른 다양한 운전특성을 적절히 설계시 장점을 극대화 할 수 있을 것이다. The superconducting fault current limiters(SFCLs) provide the effect such as enhancement in power system reliability due to limiting the fault current within a few miliseconds. Among various SFCLs we have developed a flux-lock type SFCL and exploited a special design to effectively reduce the fault current according to properly adjustable magnetic field after the short-circuit test. This SFCL consists of two copper coils wound in parallel on the same iron core and a component using the YBCO thin film connected in series to the secondary copper coil. Meanwhile, operating characteristics can be controlled by adjusting the inductances and the winding directions of the coils. To analyze the operational characteristics, we compared closed-loop with open-loop iron core. When the applied voltage was 200[Vrms] in the additive polarity winding, the peak values of the line current the increased up to 30.71[A] in the closed-loop and 32.01[A] in the open-loop iron core, respectively. On the other hand, in the voltages generated at current limiting elements were 220.14[V] in the closed-loop and 142.73[V] in the opal-loop iron core during first-half cycle after fault instant under the same conditions. We confirmed that the open-loop iron core had lower power burden than in the closed-loop iron core. Consequently, we found that the structure of iron core enabled the flux-lock type SFCL at power system to have the flexibility.
남긍현(Gueng-Hyun Nam),최효상(Hyo-Sang Choi),성태현(Tae-Hyun Sung),한영희(Young-Hee Han),이정필(Jeong-Pill Lee),한상철(Sang-Chul Han) 대한전기학회 2006 대한전기학회 학술대회 논문집 Vol.2006 No.7
The energy storage systems are being widely researched for the electric power. The operations running in a vacuum chamber mainly consists of a composite flywheel rotor, superconductor bearings, a motor/generator and its controller. Among composed the apparatus, the floating magnet bearing consists of the ring-type permanent magnets with epoxy resin impregnation for reinforcement and surface protection. In order to storage as much energy as possible, the flywheel is supposed to be rotated with very high speed. The magnetic field is analyzed by using the Maxwell 2D/3D for the simulations.
자속구속형 초전도 전류제한기의 용량증대를 위한 동작특성
남긍현(Gueng-Hyun Nam),최효상(Hyo-Sang Choi),박형민(Hyoung-Min Park),조용선(Yong-Sun Cho),이나영(Na-Young Lee),한태희(Tae-Hee Han) 대한전기학회 2006 대한전기학회 학술대회 논문집 Vol.2006 No.4
We investigated the operating characteristics of a flux-lock type superconducting fault current limiters according to the number of the serial connection each the superconducting element at the additive polarity winding of a transformer. This SFCL consists of two coils wound in parallel on the same iron core, and the secondary coil is connected to the elements in series. Operating characteristics can be controlled by adjusting the inductances and the winding directions of the coils. It turns ratio between the primary and the secondary coils is 63:21. The analysis of voltage, current, and resistance in serial connection each element was performed to increase the applied voltage of flux-lock type SFCL. When the applied voltage was 200/√3[V<SUB>rms</SUB>] with three elements connected in seres, the peak value of the line current increased up to 26,24[A]. On the other hands, resistive SFCL increased up to 36.35[A], under the same conditions. This enabled the flux-lock type SFCL to be easy to increase the capacity of power system.
직·병렬연결시 리액터를 이용한 초전도 소자의 퀜치 특성
최효상,임성훈,조용선,남긍현,이나영,박형민,Choi, Hyo-Sang,Lim, Sung-Hun,Cho, Yong-Sun,Nam, Gueng-Hyun,Lee, Na-young,Park, Hyoung-Min 한국전기전자재료학회 2005 전기전자재료학회논문지 Vol.18 No.9
We investigated quench characteristics of superconducting elements connected in series and parallel each other. The serial and parallel connections of superconducting elements causes a difficulty in simultaneous quench due to slight difference between their critical current densities. In other to induce simultaneous quench, we fabricated four type circuits; serially connected circuit before parallel connection, the circuit connected in parallel before serial connection, serially connected circuit before parallel connection with reactors, the circuit connected in Parallel before serial connection with reactors. We confirmed that the simultaneous quenches occurred in serial and parallel connections of superconducting elements using reactors. In addition, the power burden of superconducting elements was smaller than those of serial and parallel connections of superconducting elements without reactors.
Operating Characteristics of Hybrid Type Superconducting Fault Current Limiter
趙鎔善(Yong-Eun Cho),崔孝祥(Hyo-Sang Choi),南肯賢(Gueng-Hyun Nam),林成勳(Sung-Hun Lim) 대한전기학회 2006 전기학회논문지A Vol.55 No.6
We investigated the operating characteristics of the hybrid-type superconducting fault current limiter (SFCL) according to the inductance of secondary windings. The hybrid type SFCL consists of a transformer that has a primary winding and a secondary winding with serially connected YBa₂Cu₃O? (YBCO) films. The resistive-type SFCL has difficulty when it comes to raising the capacity of the SFCL due to slight differences of critical current densities between units and structure of the SFCL. The hybrid-type SFCL with closed-loop is able to achieve capacity increase through the electrical isolation and reduction of the inductance of the secondary winding with a superconducting element of the same critical current. On the other hand, the current limiting characteristics were nearly identical in the hybrid-type SFCL with open-loop compared to closed-loop, but quench time was longer than the hybrid-type SFCL with closed-loop. We confirmed that the capacity of the SFCL was increased effectively by the reduced inductance of the secondary winding. In addition, the power burden of the system also could be lowered by reducing the inductance of secondary winding.
2차회로의 직 · 병렬연결에 따른 하이브리드형 초전도 한류기의 특성
조용선(Yong-Sun Cho),박형민(Hyoung-Min Park),남긍현(Goung-Hyun Nam),이나영(Na-Young Lee),한태희(Tae-Hee Han),최효상(Choi-Sang Choi) 대한전기학회 2006 대한전기학회 학술대회 논문집 Vol.2006 No.4
We investigated the operational characteristics of the hybrid-type superconducting fault current limiter (SFCL) according to the serial and parallel connections of secondary circuits. The hybrid-type SFCL consists of a transformer, which has a primary winding and several secondary windings with YBa₂Cu₃O? films connected in series and parallel. In order to increase the capacity of the SFCL, the serial connection between each current limiting unit is necessary. The hybrid-type SFCL with the serial connection in secondary circuits could show superior characteristics than those of the parallel connections in the current limiting and Quench time. The resistances generated in the superconducting units were also lowered at the parallel connections. We confirmed that the parallel connection reduced the power burden of each superconducting unit under the same conditions because of the simultaneous Quenching between superconducting units.
이나영(Na-Young Le),최효상(Hyo-Sang Choi),정수복(Soo-Bok Jeong),이상일(Sang-ll Lee),남긍현(Gueng-Hyun Nam),임성훈(Sung-Hun Lim) 한국조명·전기설비학회 2006 한국조명·전기설비학회 학술대회논문집 Vol.2006 No.5월
Superconducting fault current(SFCLs) are expected to improve not only reliability but also stability of real power systems. The analysis on the single line-to-ground fault current of the integrated three phase flux-lock type SFCL, which consists of three flux-lock reactor wound on an iron core in each single phase and three YBCO thin films, was investigated in current limiting operating characteristics. We compared additive polarity winding with the subtractive one in the flux lock reactor. Its turns ratio each phase between the primary and the secondary coils is 63:42. When a single line-to-ground fault occurred in any phase, the peak value of line current in the fault phase of the additive polarity winding increased up to 31.44[A] during first-half cycle. On the other hand, the peak value in the subtractive polarity winding increased up to 81.77[A] under the same conditions. This is because the current flow between the primary and the secondary windings becomes to be additive or subtractive in each winding direction. We confirmed that the current limiting behavior in the additive polarity winding was more effective for a single-line-to ground fault.
한태희(Tea-hee Han),조용선(Yong-Sun Cho),박형민(Hyoung-Min Park),이나영(Na-Young Lee),남긍현(Goung-Hyun Nam),최효상(Hyo-Sang Choi),임성훈(Sung-Hun Lim),정동철(Dong-Chul Chung) 한국조명·전기설비학회 2006 한국조명·전기설비학회 학술대회논문집 Vol.2006 No.11월
The flux-lock type superconducting fault current limiter (SFCL) can be divided into the subtractive polarity winding and additive polarity winding according to the winding between the coil 1 and coil 2. We investigated quench and recovery characteristics of flux-lock type SFCL The quench time and recovery time for the superconductivity in the subtractive polarity winding became longer that of additive polarity winding under the same conditions. The quench and recovery characteristics of a superconducting element in the flux-lock type SFCL were dependent on winding direction.