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Measurement of Current Distribution in Superconducting Non-Insulated Stranded Cable

  • N. Amemiya
  • N. Tsuchioka
  • O. Tsukamoto
Part of the Advances in Cryogenic Engineering Materials book series (ACRE, volume 42)

Abstract

A method to measure the current distribution in superconducting stranded-cables without electrical insulation has been developed. Stability property of multi-strand superconducting cables is significantly influenced by the current distribution among their strands. Static current imbalance among the strands is one of the reasons for the quench current degradation in multi-strand superconducting cables. In addition to this static current distribution, we point out the transient current re-distribution during quench or recovery process can influence the stability of multi-strand superconducting cables. The measurement of current distribution in multi-strand superconducting cables is necessary to study their stability property experimentally. In our method, sets of Hall sensors arranged around the cable are used to measure the magnetic field distribution. The current in each strand is calculated with the measured magnetic field. It is possible to measure the static current distribution as well as transient one. With this method, the current distribution can be measured locally in superconducting cables made of strands without insulation where the current distribution is supposed to change along the cable axis.

Keywords

Output Voltage Current Distribution Heater Power Heat Pulse Electrical Insulation 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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References

  1. 1.
    N. Koizumi, K. Okuno, Y. Takahashi, H. Tsuji, M. Nishi, K. Yoshida, M. Sugimoto, T. Isono, T. Sasaki, H. Hiue, Y. Yasukawa, F. Hosono, T. Sasaki, Y. Wadayama, H. Tsukamoto, and S. Shimamoto, Experimental results on instability caused by non-uniform current distribution in the 30 kA NbTi Demo Poloidal Coil (DPC-U) conductor, Cryogenics. 34:155 (1994).CrossRefGoogle Scholar
  2. 2.
    N. Amemiya, K. Ryu, T. Kikuchi, and O. Tsukamoto, Influence of current re-distribution and thermal diffusion among strands on stability of superconcucting cables against local disturbances, IEEE Transactions on Magnetics. 30:2281 (1994).CrossRefGoogle Scholar
  3. 3.
    V. S. Vysotsky, V. N. Tsikhon, and G. B. J. Mulder, Quench development in superconducting cable having insulated strands with high resistive matr x (part 1, experiment), IEEE Transactions on Magnetics. 28:735 (1992).CrossRefGoogle Scholar
  4. 4.
    K. Mori, Y. Suzuki, N. Hara, M. Kitamura, and T. Tominaka, Current distribution characteristics of superconducting parallel circuits, IEEE Transactions on Magnetics. 30:1919 (1994).CrossRefGoogle Scholar
  5. 5.
    S. Kawabata, F. Sumiyoshi, T. Kawashima, T. Mito, K. Takahata, and H. Takano, Interstrand coupling effect on losses and current distributions in superconducting cable conductors, Cryogenics. 34:293 (1994).CrossRefGoogle Scholar
  6. 6.
    M. Hoshino, T. Satow, and O. Motojima, Stabi ity analysis of advanced superconductors for helical devices, Transactions of Elision Technology. 27:575 (1995).Google Scholar
  7. 7.
    V. S. Vysotsky, M. Takayasu, M. Ferri, J. V. Minervini, and S. S. Shen, New method of current distribution studies for ramp rate stability of multistrand superconducting cables, IEEE Transactions on Applied Superconductivity. 5:580 (1995).CrossRefGoogle Scholar
  8. 8.
    K. Seo, M. Morita, S. Nakamura, T. Yamada, and Y. Jizo, Minimum quench energy measurement for superconducting wires, submitted to IEEE Transactions on Magnetics, (presented at MT-14, Tampere, 1995).Google Scholar

Copyright information

© Springer Science+Business Media New York 1996

Authors and Affiliations

  • N. Amemiya
    • 1
  • N. Tsuchioka
    • 1
  • O. Tsukamoto
    • 1
  1. 1.Yokohama National UniversityYokohama, 240Japan

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