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분리된 삼상자속구속형 전류제한기의 인덕턴스 변화에 따른 전류제한 특성 분석
두승규,두호익,김민주,박충렬,김용진,이동혁,한병성,Doo, Seung-Gyu,Du, Ho-Ik,Kim, Min-Ju,Park, Chung-Ryul,Kim, Yong-Jin,Lee, Dong-Hyeok,Han, Byoung-Sung 한국전기전자재료학회 2009 전기전자재료학회논문지 Vol.22 No.6
We investigated the fault current characteristics of the separates three-phase flux-lock type superconducting fault current limiter(SFCL) according to the variation of inductances. The single-phase flux-lock type SFCL consists of two coils. The primary coil is wound in parallel to the secondary coil on an iron core. And superconductor is series connected on secondary coil. Superconductor is using the YBCO coated conductor. The separated three-phase flux-lock type SFCL consists of single-phase flux-phase type SFCL in each phase. To analyze the current limiting characteristics of a three-phase flux-lock type SFCL, the short circuit experiments were carried out fault such as the triple line-to-ground fault. The experimental result shows that fault current limiting characteristics of additive polarity winding was better than subtractive polarity winding and when the inductances of coil 2 was lower, resistances of YBCO CC was more generated.
분리된 삼상 자속구속형 전류제한기와 일체화된 삼상 자속구속형 전류제한기의 전류제한 특성 비교
두승규,두호익,김민주,박충렬,김용진,이동혁,한병성,Doo, Seung-Gyu,Du, Ho-Ik,Kim, Min-Ju,Park, Chung-Ryul,Kim, Yong-Jin,Lee, Dong-Hyeok,Han, Byoung-Sung 한국전기전자재료학회 2009 전기전자재료학회논문지 Vol.22 No.8
We investigate the comparison of fault current characteristics between the separates three-phase flux-lock type superconducting fault current limiter(SFCL) and integrated three-phase flux-lock type superconducting fault current limiter(SFCL). The single-phase flux-lock type SFCL consists of two coils. The primary coil is wound in parallel to the secondary coil on an iron core and superconducting elements are connected to secondary coil in series. Superconducting elements are used by the YBCO coated conductor. The separated three-phase flux-lock type SFCL consists of single-phase flux-phase type SFCL in each phase. But the integrated three-phase flux-lock type SFCL consists of three-phase flux-reactors wound on an iron core. Flux-reactor consists of the same turn's ratio between coil 1 and coil 2 for each single phase. To compare the current limiting characteristics of the separated three-phase flux-lock type SFCL and integrated three-phase flux-lock type SFCL, the short circuit experiments are carried out fault condition such as the single line-to-ground fault. The experimental result shows that fault current limiting characteristic of the separated three-phase flux-lock type SFCL was better than integrated three-phase flux-lock type SFCL. And the integrated three-phase flux-lock type SFCL has an effect on sound phase.
나선형 Former의 직경에 따른 YBCO Coated Conductor의 사고전류 통전특성 분석
김민주,두호익,두승규,김용진,이동혁,한병성,Kim, Min-Ju,Du, Ho-Ik,Doo, Seung-Gyu,Kim, Yong-Jin,Lee, Dong-Hyeok,Han, Byung-Sung 한국전기전자재료학회 2009 전기전자재료학회논문지 Vol.22 No.12
YBCO coated conductor is named by second generation superconductor tapes. It is different with first generation superconductor tapes. YBCO coated conductor's specific difference with Bi-2223/Ag tape is more strong mechanical durability. This is important role to apply to superconducting machines. For mechanical transforming of YBCO coated conductors, we are using the well designed former. The merit of transformation is several. First, we vary the superconducting characteristics according to mechanical stress. Second, we reduce the volume of superconductor, so we achieve reducing the volume of superconducting machines. On this study, we experiment the transporting current characteristics of one types YBCO coated conductor. YBCO coated conductor with Ie of 70 A and voltage grade of 0.6 V/cm were connected to spiral former to conduct current application test.
YBCO Coated Conductor를 이용한 저항형 전류제한기의 인가전압 증가에 따른 전류제한 특성
두호익,김민주,두승규,김용진,이동혁,한병성,Du, Ho-Ik,Kim, Min-Ju,Doo, Seung-Gyu,Kim, Yong-Jin,Lee, Dong-Hyeok,Han, Byoung-Sung 한국전기전자재료학회 2009 전기전자재료학회논문지 Vol.22 No.10
The YBCO coated conductor is an important element that forms the superconducting power equipment. The first advantage of applying YBCO coated conductor to superconducting power equipment is that it can effectively addresses the normal and fault currents using less quantity of wire than when using Bi tape due to its high critical current density. Second, it can limit the fault current fast because its index value is high. so that the resistance can be produced fast when it is applied to the superconducting current limiting element. Third, the type of stabilization layer that surrounds the YBCO superconductor is selectable and the magnitude of the resistance that is produced from quenching can be adjusted. This study researched into the manufacture of current-limiting element of using YBCO coated conductor, into the characteristics of current limiter that considered by combining the manufactured element with the resistive-type superconducting fault current limiter.
삼상 분리형 자속커플링 전류제한기의 2차 권선의 턴 수 및 결선 방향에 따른 전류제한 특성
김용진,두호익,두승규,김민주,이동혁,한병성,Kim, Yong-Jin,Du, Ho-Ik,Doo, Seung-Gyu,Kim, Min-Ju,Lee, Dong-Hyeok,Han, Byoung-Sung 한국전기전자재료학회 2009 전기전자재료학회논문지 Vol.22 No.8
The separated three-phase flux-coupling type superconducting fault current limiter(SFCL) is composed of a series transformer and superconducting unit of the YBCO coated conductor. The primary and secondary coils in the transformer were wound in series each other through an iron core and the YBCO coated conductor was connected with secondary coil in parallel. In this paper, we investigated the current limiting characteristics through winding number of coil 2 and winding direction in the flux-coupling type SFCL. Through the analysis, it was shown that additive polarity condition and lower winding number of coil 2 have advantaged from the point of view of fault current limiting and burned of YBCO coated conductor.
안정화 층을 갖는 YBCO Coated Conductor와 BSCCO 선재의 결합이 과전류 통전 특성에 미치는 영향
두호익,김민주,박충렬,두승규,김용진,한병성,Du, Ho-Ik,Kim, Min-Ju,Park, Chung-Ryul,Doo, Seung-Gyu,Kim, Yong-Jin,Han, Byoung-Sung 한국전기전자재료학회 2008 전기전자재료학회논문지 Vol.21 No.10
YBCO coated conductor called the second-generation superconducting tapes have resistance increase significantly more than BSCCO tapes in terms of the speed or amount when quench occurs, they may have different ranges of application. Such characteristics are thought to get different properties by selection of stabilizing materials in manufacturing superconducting tapes. It is important in selecting superconducting tapes which will be applied to power devices in the future. In this study, one kind of BSCCO tapes and two kinds of YBCO CC with different stabilizing materials and one kind of YBCO CC with non stabilizing materials were used to compare and examine transport characteristics in flux-flow state and quench state with each tape joint of HTS tapes.