Instability of NbTi/CuNi superconducting wires

M. Tsuda, H. Takamatsu, Atsushi Ishiyama

    Research output: Contribution to journalArticle

    14 Citations (Scopus)

    Abstract

    Superconducting wires with a CuNi matrix for a.c. applications are not fully stabilized and normal transition is easily induced by various disturbances because the CuNi matrix has a high electrical resistivity and a very low thermal conductivity. We have investigated normal-zone propagation velocities in NbTi/CuNi superconducting wires. In a.c. applications of superconductivity we also need to know the thermal and the electromagnetic behaviour during such the abrupt increase of currents as short-circuit current in superconducting transformers, the current changing in superconducting current limiters and the current redistribution during quench process in multistrand cables. We measured the degradation of the quench current of NbTi superconducting wires with a CuNi matrix as a function of the current sweep rate in the range of 10 A/s to 100 kA/s and the initial current, which is a transport current just before current changing. Experimental data is compared with analytical results by the finite element method taking the magnetic and the thermal diffusion in radial direction of wire cross-section into account. From these comparisons, the relation between the rate of current changing and the degradation of the quench current in superconducting wires is discussed.

    Original languageEnglish
    Pages (from-to)503-506
    Number of pages4
    JournalIEEE Transactions on Applied Superconductivity
    Volume3
    Issue number1 pt 2
    DOIs
    Publication statusPublished - 1993 Mar

    Fingerprint

    Superconducting wire
    wire
    Degradation
    Thermal diffusion
    Limiters
    Superconductivity
    Short circuit currents
    Thermal conductivity
    Cables
    Wire
    Finite element method
    matrices
    degradation
    propagation velocity
    thermal diffusion
    short circuit currents
    transformers
    cables
    finite element method
    disturbances

    ASJC Scopus subject areas

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

    Cite this

    Instability of NbTi/CuNi superconducting wires. / Tsuda, M.; Takamatsu, H.; Ishiyama, Atsushi.

    In: IEEE Transactions on Applied Superconductivity, Vol. 3, No. 1 pt 2, 03.1993, p. 503-506.

    Research output: Contribution to journalArticle

    Tsuda, M. ; Takamatsu, H. ; Ishiyama, Atsushi. / Instability of NbTi/CuNi superconducting wires. In: IEEE Transactions on Applied Superconductivity. 1993 ; Vol. 3, No. 1 pt 2. pp. 503-506.
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