Degradation of YBCO coated conductors due to over-current pulse

Atsushi Ishiyama, Yasutake Tanaka, Hiroshi Ueda, Yuh Shiohara, Takato Machi, Yasuhiro Iijima, Takashi Saitoh, Naoji Kashima, Masami Mori, Tomonori Watanabe, Shigeo Nagaya

    Research output: Contribution to journalArticle

    21 Citations (Scopus)

    Abstract

    For HTS (High-Temperature Superconductor) applications to electric power devices, superconductors are subjected to short-circuit fault currents 10 to 30 times the normal operating current. These over-currents will drive the HTS conductors normal and degrade or burn-out the HTS conductors. Therefore it is important to establish a novel thermal stability criterion for over-current pulse drive. In this study, we carried out preliminary experiments on the damage caused by over-current pulse drive focusing on the limitation of the temperature rise without degradation. We prepared five YBCO sample tapes fabricated with IBAD/PLD and IBAD/ MOCVD methods. Measurements were performed at 60 K and 80 K (Conduction cooling with Gifford-McMahon cryocooler was adopted) in self-field. The experimental results indicated that the degradation of the sample tapes for the over-current pulse with a duration of 1 second depended on not the initial critical current Ic, but the peak temperature Tpeak. The permissible peak temperature without degradation existed at about 400-600 K. The sample tapes were also observed before and after the experiments by magneto-optic (MO) imaging to find the distribution of degradation area.

    Original languageEnglish
    Pages (from-to)3509-3512
    Number of pages4
    JournalIEEE Transactions on Applied Superconductivity
    Volume17
    Issue number2
    DOIs
    Publication statusPublished - 2007 Jun

    Fingerprint

    High temperature superconductors
    conductors
    Tapes
    degradation
    Ion beam assisted deposition
    Degradation
    pulses
    high temperature superconductors
    tapes
    Magnetooptical effects
    Electric fault currents
    Critical currents
    Metallorganic chemical vapor deposition
    Stability criteria
    Pulsed laser deposition
    Short circuit currents
    Temperature
    Superconducting materials
    Thermodynamic stability
    Experiments

    Keywords

    • Degradation
    • Over-current pulse
    • Temperature limitation
    • YBCO tape

    ASJC Scopus subject areas

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

    Cite this

    Degradation of YBCO coated conductors due to over-current pulse. / Ishiyama, Atsushi; Tanaka, Yasutake; Ueda, Hiroshi; Shiohara, Yuh; Machi, Takato; Iijima, Yasuhiro; Saitoh, Takashi; Kashima, Naoji; Mori, Masami; Watanabe, Tomonori; Nagaya, Shigeo.

    In: IEEE Transactions on Applied Superconductivity, Vol. 17, No. 2, 06.2007, p. 3509-3512.

    Research output: Contribution to journalArticle

    Ishiyama, A, Tanaka, Y, Ueda, H, Shiohara, Y, Machi, T, Iijima, Y, Saitoh, T, Kashima, N, Mori, M, Watanabe, T & Nagaya, S 2007, 'Degradation of YBCO coated conductors due to over-current pulse', IEEE Transactions on Applied Superconductivity, vol. 17, no. 2, pp. 3509-3512. https://doi.org/10.1109/TASC.2007.899708
    Ishiyama, Atsushi ; Tanaka, Yasutake ; Ueda, Hiroshi ; Shiohara, Yuh ; Machi, Takato ; Iijima, Yasuhiro ; Saitoh, Takashi ; Kashima, Naoji ; Mori, Masami ; Watanabe, Tomonori ; Nagaya, Shigeo. / Degradation of YBCO coated conductors due to over-current pulse. In: IEEE Transactions on Applied Superconductivity. 2007 ; Vol. 17, No. 2. pp. 3509-3512.
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