• 제목/요약/키워드: H-SFCL

검색결과 47건 처리시간 0.022초

YBCO coated conductors(CCs)의 안정화재 두께 변화에 따른 quench/recovery 특성 분석에 관한 연구 (Quench/recovery test results of the YBCO coated conductors(CCs) having various stabilizer thicknesses)

  • 권나영;김현성;김광록;김경준;임성우;김혜림;현옥배;이해근
    • 한국초전도ㆍ저온공학회논문지
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    • 제11권3호
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    • pp.10-14
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    • 2009

  • Since a stabilizer of YBCO coated conductor (CC) plays a very important role of bypassing over-current and transferring heat generated in the moment of fault, it is one of big issues to determine the material of the stabilizer and its dimension for the high performance of the HTS power application system. Especially, in the case of a superconducting fault current limiter (SFCL), which requires it to react immediately to the occurrence of fault, characteristics of stabilizer are decisive in limiting fault current and recovering superconducting properties during and after quenching. In this paper, the quench / recovery characteristics of YBCO CCs with various thickness of stabilizer were analyzed. The quench/recovery test carried out at 20 $V_{rms}$, 5 cycles (60 Hz) and results showed that as the thickness of the stabilizer decreased, both the final approach temperature and the recovery time decreased.

  • https://doi.org/10.9714/psac.2009.11.3.010 인용 PDF KSCI

액체질소를 사용하는 초전도 고전압 전력기기의 절연 특성 연구 (Analytical and Experimental studies on Dielectric Characteristics of High Voltage Superconducting Machines in Liquid Nitrogen)

  • 나진배;고태국;강형구;석복렬;김태중
    • 한국초전도ㆍ저온공학회논문지
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    • 제13권1호
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    • pp.46-50
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    • 2011

  • The electrical insulation design of high voltage superconducting fault current limiters (SFCLs) should be confirmed to be applied for the stabilization of the power grid. This paper describes numerical analysis and AC dielectric experiments for developing high voltage SFCLs. The electric field distributions between applied high voltage part and ground were calculated by finite element method (FEM) simulation tool and AC criterion of liquid nitrogen at 200 kPa was calculated from correlation between the field utilization factor and FEM simulation results. This paper deals with ceonceptual insulation design of a 154 kV class single-phase no-inductively wound solenoid type SFCL which was focused on gap distance between the cryostat and superconducting coils. Furthermore, the shield ring effect was confirmed to reduce maximum electric field at applied high voltage part.

  • https://doi.org/10.9714/psac.2011.13.1.046 인용 PDF KSCI

6.6kV/200A급 유도형 한류기용 과냉질소 냉각시스템의 특성 (Characteristic of sub-cooled nitrogen cryogenic system for 6.6kV/200A Inductive Superconducting Fault Current Limiter)

  • 박동근;강형구;윤경용;주민석;김태중;고태국
    • 한국초전도저온공학회:학술대회논문집
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    • 한국초전도저온공학회 2003년도 추계학술대회 논문집
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    • pp.234-236
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    • 2003

  • The cryogenic system for inductive superconducting fault current limiter (SFCL) has been investigated recently. In this investigation, the sub-cooled nitrogen cryogenic system was adopted to enhance the performance of DC reactor for 6.6㎸/200A inductive SFCL. In sub-cooled nitrogen state at 64K, the critical current value and the thermal conductivity are larger than those of saturated nitrogen state at 77K and the electrical insulation capacitance should be remarkably enhanced. The solenoid type of 84mH superconducting DC reactor was fabricated and cooled down to 64K by using sub-cooled cooling method with GM-cryocooler and rotary pump. The fabrication techniques of cryogenic system and some experimental results such as cooling down characteristic are introduced in this study. Moreover, the sub-cooled nitrogen cryogenic system was detailedly introduced in this paper.

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Bi-2212/Cu-Ni 튜브로 제작한 초전도 한류소자의 단락사고시험 결과 (Fabrication and Fault Test Results of Bi-2212/Cu-Ni Tubes for Superconducting Fault Current Limiting Elements)

  • 오성용;임성우;유승덕;김혜림;현옥배
    • Progress in Superconductivity
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    • 제10권1호
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    • pp.45-49
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    • 2008

  • For the development of superconducting fault current limiters (SFCLs), fault current limiting elements were fabricated out of Bi-2212 bulk tubes and tested. The SFCL elements consisted of tube shaped Bi-2212 bulks and metal shunts for the stabilizers. Firstly, the Bi-2212 bulk tubes were processed based on a design of monofilar coils in order to acquire large resistance and high voltage rating. 300 mm-long Bi-2212 tubes were designed to have the current path of 410 cm in length with 24 turns and 41 mm in diameter. The processed monofilar coil, as designed, had 300 A $I_c$ at 77 K. The fabricated superconducting monofilar coils were affixed to Cu-Ni alloy as that of stabilizers. The Cu-Ni alloys were processed to have the same shape of the superconducting monofilar coils. The Cu-Ni coil had resistivity of 32 ${\mu}{\Omega}$-cm at 77 K and 37 ${\mu}{\Omega}$-cm at 300 K. The metal shunts were attached to the outside of the Bi-2212 monofilar coil by a soldering technique. After the terminals made of copper were attached to both ends of the superconductor-metal shunt composite, the gap between the turns and the surface of the elements was filled with an epoxy and a dense mesh made of FRP in order to enhance the mechanical strength. The completed SFCL elements went through fault tests, and we confirmed that the voltage rating of 143 $V_{rms}$ (E =0.35 $V_{rms}$/cm) could be accomplished.

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