A criterion for determining stabilizer thickness of YBCO coated conductors based on coil protection

Atsushi Ishiyama, Hiroshi Ueda, Taketoshi Ando, Hironori Naka, Sadanori Bamba, Yuh Shiohara

    Research output: Contribution to journalArticle

    36 Citations (Scopus)

    Abstract

    The purpose of this study is to propose a criterion for determining stabilizer thickness of YBCO coated conductors. The permissible disturbance energy density in high-temperature superconductors (HTSs) is two or three orders of magnitude greater than that in low-temperature superconductors (LTSs). On the other hand, to enhance the reliability and safety of HTS colls, an establishment of a protection scheme assuming a quench caused by a failure in power supply, cooling system or similar problem is also required for HTS coil systems. Quenching produces excessive temperature or voltage in the coil winding; overheating may cause the conductor to meltdown, or high voltage may punch a hole in the winding. To avoid these types of damages in YBCO coils, a suitable stabilizer thickness must be determined for the sophisticated structure of YBCO coated conductors, which are composed of highly textured thin-film on a flat flexible substrate. Therefore, we investigate the appropriate structure for YBCO coated conductors from the perspective of energy dumping (i.e., quench protection). Based on the protection scheme that the stored magnetic energy in the coils is dumped by an external dump resistance prepared as a quench protection, we derive a function that examines the heat balance of a quenching YBCO coil in an adiabatic condition and propose a criterion using the function to determine an appropriate stabilizer thickness for YBCO coated conductors.

    Original languageEnglish
    Pages (from-to)2430-2433
    Number of pages4
    JournalIEEE Transactions on Applied Superconductivity
    Volume17
    Issue number2
    DOIs
    Publication statusPublished - 2007 Jun

    Fingerprint

    High temperature superconductors
    coils
    conductors
    high temperature superconductors
    Quenching
    Electric potential
    Cooling systems
    Superconducting materials
    quenching
    dumping
    adiabatic conditions
    heat balance
    punches
    cooling systems
    Thin films
    Temperature
    power supplies
    Substrates
    high voltages
    safety

    Keywords

    • Quench protection
    • Stabilizer thickness
    • YBCO coated conductors

    ASJC Scopus subject areas

    • Electrical and Electronic Engineering
    • Physics and Astronomy (miscellaneous)

    Cite this

    A criterion for determining stabilizer thickness of YBCO coated conductors based on coil protection. / Ishiyama, Atsushi; Ueda, Hiroshi; Ando, Taketoshi; Naka, Hironori; Bamba, Sadanori; Shiohara, Yuh.

    In: IEEE Transactions on Applied Superconductivity, Vol. 17, No. 2, 06.2007, p. 2430-2433.

    Research output: Contribution to journalArticle

    Ishiyama, Atsushi ; Ueda, Hiroshi ; Ando, Taketoshi ; Naka, Hironori ; Bamba, Sadanori ; Shiohara, Yuh. / A criterion for determining stabilizer thickness of YBCO coated conductors based on coil protection. In: IEEE Transactions on Applied Superconductivity. 2007 ; Vol. 17, No. 2. pp. 2430-2433.
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