Stability and protection of coils wound with YBCO bundle conductor

Hiroshi Ueda, Atsushi Ishiyama, Koji Shikimachi, Naoki Hirano, Shigeo Nagaya

    Research output: Contribution to journalArticle

    9 Citations (Scopus)

    Abstract

    The thermal behavior of a high-temperature superconducting (HTS) coil is significantly different from that of a low-temperature superconducting (LTS) coil. A HTS conductor has a greater volumetric heat capacity at the operating temperature envisaged for practical applications. Therefore, a HTS coil is much less likely to be quenched than a LTS coil by mechanical disturbances such as the heat generated by the cracking of the impregnation material or by the friction resulting from wire movements. However, the HTS conductor is cyclically subjected to tensile strain because electrical charging and discharging are repeated in real applications involving the Superconducting Magnetic Energy Storage (SMES) system. The superconducting characteristics may locally deteriorate due to this cyclic strain. Therefore, to enhance the reliability and safety of the HTS coil, a quench protection scheme is needed. Because the normal-zone propagation velocity is quite low, detecting a non-recovering normal zone is difficult in HTS coils, and quenching produces excessive overheating that may cause the conductor to melt. In this study, we focus on a coil wound with a YBCO bundle conductor used in SMES applications and investigate the redistribution characteristics of the transport current in and the thermal behavior of the coil during a quench; we use a newly developed computer code based on the finite element method (FEM) and an equivalent circuit. We also discuss a protection scheme to dump the magnetic energy stored in the coils on an external resistance connected in parallel.

    Original languageEnglish
    Article number5438884
    Pages (from-to)1320-1323
    Number of pages4
    JournalIEEE Transactions on Applied Superconductivity
    Volume20
    Issue number3
    DOIs
    Publication statusPublished - 2010 Jun

    Fingerprint

    bundles
    coils
    conductors
    Temperature
    magnetic energy storage
    Energy storage
    Tensile strain
    propagation velocity
    operating temperature
    equivalent circuits
    Impregnation
    Equivalent circuits
    Specific heat
    charging
    Superconducting coils
    Quenching
    safety
    finite element method
    disturbances
    friction

    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

    Stability and protection of coils wound with YBCO bundle conductor. / Ueda, Hiroshi; Ishiyama, Atsushi; Shikimachi, Koji; Hirano, Naoki; Nagaya, Shigeo.

    In: IEEE Transactions on Applied Superconductivity, Vol. 20, No. 3, 5438884, 06.2010, p. 1320-1323.

    Research output: Contribution to journalArticle

    Ueda, Hiroshi ; Ishiyama, Atsushi ; Shikimachi, Koji ; Hirano, Naoki ; Nagaya, Shigeo. / Stability and protection of coils wound with YBCO bundle conductor. In: IEEE Transactions on Applied Superconductivity. 2010 ; Vol. 20, No. 3. pp. 1320-1323.
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