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Characteristics of NbTi mechanical persistent current switch and mechanism of superconducting connection at contact.

Author(s) : OHTSUKA S., OHTSUBO H., NAKAMURA T., et al.

Type of article: Article

Summary

Case studies on energy losses due to the ON resistance of a mechanical switch and OFF resistance of a superconducting switch are carried out so as to show the necessity of a mechanical switch as a persistent current switch (PCS) in a large-scale SMES system. The contact resistance characteristics of a mechanical switch with NbTi bulk contact pieces are experimentally investigated as a function of switch driving force, switch pressing force, and ON-OFF operation number. The developed mechanical PCS, which has zero contact resistance, supports a superconducting current flow of more than 200 A. The formation mechanism of the superconducting connection at contact is modelled and analyzed based on theoretical considerations.

Details

  • Original title: Characteristics of NbTi mechanical persistent current switch and mechanism of superconducting connection at contact.
  • Record ID : 2000-1690
  • Languages: English
  • Source: Cryogenics - vol. 38 - n. 9
  • Publication date: 1998/09

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