Progress in Superconductivity

The Korean Superconductivity Society (한국초전도학회)
권호 표지

A study on the safe operation condition for Bi-2223/Ag tapes with applied alternating currents

교류용 Bi-2223/Ag 선재의 안정 통전 조건에 관한 연구

  • Yim S. W. (Research Center of Industrial Technology, Chonbuk National University) ;
  • Sohn S. H. (Advanced Technology Center, Korea Electric Power Research Institute) ;
  • Hwang S. D. (Advanced Technology Center, Korea Electric Power Research Institute) ;
  • Lim S. H. (Research Center of Industrial Technology, Chonbuk National University)
  • Published : 2005.04.01
Download PDF
⟨ Previous Next ⟩

Abstract

Bi-2223/Ag tapes need to be safe, even it is under the over-critical current state for the protection of a superconducting power machine. However, it is not easy to identify the condition for the safe operation because of their broad S/N transition region. In this paper, for the study of the operation condition of Bi-2223/ Ag tapes, we investigated the V-I curves and the temperature variation of Bi-2223/ Ag tapes experimentally, applying alternating over-currents, and analyzed the relationship between resistance and temperature increase. For the experiments, a Bi-2223/Ag tape of 57 A $I_c$ was prepared, and the over-critical current characteristics under adiabatic state from $LN_2$ was measured. From the experiments, we confirmed that the Joule heating predicted by V-I curve corresponded with the increase of the measured temperature exactly. Using the results, a safe operation condition of Bi-2223 tape was discussed.

Keywords