Quench detection method for cryocooler-cooled YBCO pancake coil for SMES

Hideaki Ohnishi, Atsushi Ishiyama, Tomonori Watanabe, Naoki Hirano, Shigeo Nagaya

    Research output: Contribution to journalArticle

    3 Citations (Scopus)

    Abstract

    In this study, we focus on a quench detection method for a cryocooler-cooled double pancake coil wound with an YBCO bundle conductor for superconducting magnetic energy storage. Because the local normal-zone propagation velocity is significantly slower in a high-temperature superconducting coil than that in a low-temperature superconducting coil, it is difficult to detect the local normal transition using a voltage between both coil ends. In the application of an YBCO coil for superconducting magnetic energy storage, quench detection is considered to be more difficult because of the noise of the converter or other equipment. Therefore, the normal transition and quench must be detected using some other method. A current detection method, which measures the current redistribution in the YBCO coil with hall probes, was proposed and verified to be able to determine the normal transition by the numerical simulations in the previous paper. In this study, on the basis of the current detection method, the experiments and numerical simulation were performed on a cryocooler-cooled small model double-pancake coil wound with an YBCO bundle conductor composed of four electrically insulated YBCO tapes. As the results, the current detection method was verified to be effective in detecting the local normal transition; Hall probes were used to measure the magnetic field and to estimate the current in individual YBCO tapes making up the bundle conductor.

    Original languageEnglish
    Article number6381469
    JournalIEEE Transactions on Applied Superconductivity
    Volume23
    Issue number3
    DOIs
    Publication statusPublished - 2013

    Fingerprint

    Tapes
    Energy storage
    coils
    Computer simulation
    magnetic energy storage
    bundles
    Magnetic fields
    conductors
    Temperature
    Electric potential
    tapes
    Experiments
    probes
    propagation velocity
    Superconducting coils
    converters
    simulation
    electric potential
    estimates
    magnetic fields

    Keywords

    • Quench detection
    • YBCO bundle conductor
    • YBCO coil

    ASJC Scopus subject areas

    • Electrical and Electronic Engineering
    • Condensed Matter Physics
    • Electronic, Optical and Magnetic Materials

    Cite this

    Quench detection method for cryocooler-cooled YBCO pancake coil for SMES. / Ohnishi, Hideaki; Ishiyama, Atsushi; Watanabe, Tomonori; Hirano, Naoki; Nagaya, Shigeo.

    In: IEEE Transactions on Applied Superconductivity, Vol. 23, No. 3, 6381469, 2013.

    Research output: Contribution to journalArticle

    Ohnishi, Hideaki ; Ishiyama, Atsushi ; Watanabe, Tomonori ; Hirano, Naoki ; Nagaya, Shigeo. / Quench detection method for cryocooler-cooled YBCO pancake coil for SMES. In: IEEE Transactions on Applied Superconductivity. 2013 ; Vol. 23, No. 3.
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