Evaluation on Quench Protection for No-Insulation REBCO Pancake Coil

Takahiro Oki, Aika Ikeda, Tao Wang, Atsushi Ishiyama, So Noguchi, Katsutoshi Monma, Tomonori Watanabe, Shigeo Nagaya

    Research output: Contribution to journalArticle

    11 Citations (Scopus)

    Abstract

    We have been developing a no-insulation (NI) winding technique to be used in both high thermal stability and high current density, which have a tradeoff relationship. This paper presents numerical and experimental studies on the thermal stability of an NI REBCO pancake coil by focusing on a quench protection scheme. In the case of an accident or a local normal-state transition, the power supply for the superconducting coil must be immediately shut down in order to ensure its safety. During the sudden discharging of a conventional insulated winding coil, most of the stored electromagnetic energy is dissipated by an external dump resistor connected across the coil terminals as a quench protection system. However, in an NI pancake coil, current flows in the radial direction in order to bypass the local normal-state area to the adjacent turns. The stored energy in the coil may be dissipated as Joule heat owing to the turn-to-turn contact electrical resistance. In this study, by using experiments and numerical analyses, we evaluated two transient behaviors during sudden discharging: the distribution of energy dissipation and the temperature increase in model NI REBCO pancake coils. We also evaluated the thermal behavior of the NI coil during a local normal transition.

    Original languageEnglish
    Article number7429748
    JournalIEEE Transactions on Applied Superconductivity
    Volume26
    Issue number4
    DOIs
    Publication statusPublished - 2016 Jun 1

    Fingerprint

    insulation
    Insulation
    coils
    evaluation
    Thermodynamic stability
    Acoustic impedance
    thermal stability
    Electromagnetic waves
    Resistors
    Energy dissipation
    Accidents
    Current density
    bypasses
    tradeoffs
    accidents
    electrical resistance
    resistors
    power supplies
    high current
    safety

    Keywords

    • High-temperature superconductors
    • no-insulation coil
    • partial element equivalent-circuit model
    • quench protection

    ASJC Scopus subject areas

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

    Cite this

    Evaluation on Quench Protection for No-Insulation REBCO Pancake Coil. / Oki, Takahiro; Ikeda, Aika; Wang, Tao; Ishiyama, Atsushi; Noguchi, So; Monma, Katsutoshi; Watanabe, Tomonori; Nagaya, Shigeo.

    In: IEEE Transactions on Applied Superconductivity, Vol. 26, No. 4, 7429748, 01.06.2016.

    Research output: Contribution to journalArticle

    Oki, Takahiro ; Ikeda, Aika ; Wang, Tao ; Ishiyama, Atsushi ; Noguchi, So ; Monma, Katsutoshi ; Watanabe, Tomonori ; Nagaya, Shigeo. / Evaluation on Quench Protection for No-Insulation REBCO Pancake Coil. In: IEEE Transactions on Applied Superconductivity. 2016 ; Vol. 26, No. 4.
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