• Title/Summary/Keyword: monofilar coil

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

  • Oh, S.Y.;Yim, S.W.;Yu, S.D.;Kim, H.R.;Hyun, O.B.
    • Progress in Superconductivity
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    • v.10 no.1
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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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Computation of the Current Limiting Behavior of BSCCO-2212 High-Temperature Superconducting Tube with Shunt Coils

  • Kim, H.M.;Park, K.B.;Lee, B.W.;Oh, I.;Sim, J.;Hyun, O.B.
    • Progress in Superconductivity and Cryogenics
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    • v.8 no.4
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    • pp.22-25
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    • 2006

  • This paper deals with the computation of the current limiting behavior of high-temperature superconducting (HTS) modules for the superconducting fault current limiter (SFCL). The SFCL module consists of a monofilar type BSCCO-2212 tube and a shunt coil made of copper or brass. The shunt coil is connected to the monofilar superconducting tube in parallel. Through analysis of the quench behavior of the monofilar component with shunt coils, it is achieved to drive an equivalent circuit equation from the experimental circuit structure. In order to analyze the quench behavior of the SFCL module, we derived a partial differential equation technique. Inductance of the monofilar component and the impedance of the shunt coil are calculated by Bio-Savart and Ohm's formula, respectively. We computed the quench behavior using the calculated values, and compared the results with experimental results for the quench characteristics of a component. The results of computation and test agreed well each other, and it was concluded that the analytic result could be applied effectively to design of the distribution-level SFCL system.

  • https://doi.org/10.9714/psac.2006.8.4.022 인용 PDF KSCI