同軸多層撚り超電導導体の均一電流分布に関する実験

DOI Web Site 被引用文献10件 参考文献12件

書誌事項

タイトル別名
  • Experiment for Homogeneous Current Distribution in a Multilayer Coaxial Superconductor.
  • ドウジク タソウ ヨリ チョウデンドウ ドウタイ ノ キンイツ デンリュウ ブンプ ニ カンスル ジッケン

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抄録

A multilayer coaxial superconductor has been investigated theoretically and experimentally for realizing homogeneous current distribution. The theory, based on the magnetic conservation law defining net magnetic flux enclosed by the electric center lines of the two filaments in the two strands corresponding to adjacent layers to be zero, gives a generalized formula governing the current distribution. It was shown from the formulation that the current distribution can be homogenized by adjusting the twist pitches of a multilayer superconductor with particular layer radii and twist direction. To verify the theory, we have fabricated a three-layer coaxial superconductor 1m long and thereby carried out its test. The conductor was composed of Ag-sheathed Bi2223 tapes wound spirally onto three tubular FRP (Fiber Reinforced Plastic) formers with pitches of 333.33mm, 166.67mm, and 111.11mm corresponding to the first (innermost), second and third layers, respectively. To minimize contact resistance between the HTS tapes and terminals, a ladder-shaped pretreated Cu block was employed for the end connection. The test was performed at 77K by imposing AC transport current in the range of 0-100 ampere maximum value with a frequency of 100Hz. The measured currents of the first, second, and third layers were 30.25%, 36.82% and 32.935% of total transport current, respectively. This result evidently is in good agreement with that of the theory. This paper describes the design, construction and experimental results of a test superconducting multilayer cable based on the homogeneous current theory.

収録刊行物

  • 低温工学

    低温工学 36 (1), 10-15, 2001

    公益社団法人 低温工学・超電導学会 (旧 社団法人 低温工学協会)

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