Quench detection and protection of cryocooler-cooled YBCO pancake coil for SMES

Hiroshi Ueda, Atsushi Ishiyama, Kazuki Muromachi, Takahiro Suzuki, Koji Shikimachi, Naoki Hirano, Shigeo Nagaya

    Research output: Contribution to journalArticle

    8 Citations (Scopus)

    Abstract

    In this paper, we focus on the quench detection and protection of a cryocooler-cooled pancake coil for SMES wound with a YBCO bundle conductor composed of laminated electrically insulated YBCO-coated conductors. Because the normal-zone propagation velocity is much slower in a high-temperature superconducting (HTS) coil than in a low-temperature superconducting (LTS) coil, the detection of the non-recovering normal zone using a voltage signal is quite difficult. Quench detection is considered to be more difficult during SMES operation because of the noise of the converter or other equipment. Therefore, a quench must be detected using some other method. In the previous paper, we showed that a quench in the coil could be detected by observing the transposition of the current in the bundle conductor caused by local normal transition. In this paper, based on this quench detection method, we investigate the transposition of current and the thermal behavior during the quench detection and the dumping of the stored energy by an external resistance in coils wound with a YBCO laminated bundle conductor for SMES and determine the appropriate stabilizer thickness of the YBCO-coated conductors.

    Original languageEnglish
    Article number4702804
    JournalIEEE Transactions on Applied Superconductivity
    Volume22
    Issue number3
    DOIs
    Publication statusPublished - 2012

    Fingerprint

    coils
    conductors
    bundles
    Temperature
    Electric potential
    dumping
    propagation velocity
    converters
    Superconducting coils
    electric potential
    Hot Temperature
    energy

    Keywords

    • Normal propagation
    • protection
    • stability
    • YBCO bundle conductor

    ASJC Scopus subject areas

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

    Cite this

    Quench detection and protection of cryocooler-cooled YBCO pancake coil for SMES. / Ueda, Hiroshi; Ishiyama, Atsushi; Muromachi, Kazuki; Suzuki, Takahiro; Shikimachi, Koji; Hirano, Naoki; Nagaya, Shigeo.

    In: IEEE Transactions on Applied Superconductivity, Vol. 22, No. 3, 4702804, 2012.

    Research output: Contribution to journalArticle

    Ueda, Hiroshi ; Ishiyama, Atsushi ; Muromachi, Kazuki ; Suzuki, Takahiro ; Shikimachi, Koji ; Hirano, Naoki ; Nagaya, Shigeo. / Quench detection and protection of cryocooler-cooled YBCO pancake coil for SMES. In: IEEE Transactions on Applied Superconductivity. 2012 ; Vol. 22, No. 3.
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