Recovery time of Bi-2223/Ag HTS tape after quench by short-time over-current

Author

Ishigohka, T. ; Inaba, M. ; Fujinami, T. ; Ninomiya, A. ; Arai, K. ; Umeda, M.

Author_Institution

Seikei Univ., Tokyo, Japan

Volume

14

Issue

2

fYear

2004

fDate

6/1/2004 12:00:00 AM

Firstpage

1062

Lastpage

1065

Abstract

Recovery time of Bi-2223/Ag HTS tapes after quench by short-time AC over-current has been observed. The experiment is carried out using an electromagnetic switching circuit. In order to confirm the state of the tape, a small DC current is fed continuously to the tape. The HTS tape is immersed in liquid nitrogen bath. The duration of the over-current is about 100-200 ms (5-10 cycles in 50 Hz), and the magnitude of the transient AC current is 150 A which is about 3 times larger than the DC critical current of the tape. The experimental result shows that the normal voltage generated by the over-current disappears about 2 ms after the end of the over-current. In addition to the experiment on HTS tapes, an experiment on a HTS coil wound by Bi-2223/Ag HTS tape is carried out. Also from this experiment good superconducting-to-normal-conducting recovery characteristics are confirmed. These experimental results will encourage the possibility of many applications of HTS tapes to power apparatus.

Keywords

bismuth compounds; calcium compounds; composite superconductors; critical current density (superconductivity); high-temperature superconductors; lead compounds; quenching (thermal); silver; strontium compounds; superconducting coils; superconducting tapes; 150 A; AC over-current; Bi-2223/Ag HTS tape; Bi_2-xPb_xSr₂Ca₂Cu₃O₁₀-Ag; DC critical current; DC current feeding; HTS coil wound; electromagnetic switching circuit; high-temperature superconductors; liquid nitrogen bath; quench recovery time; quenching; short-time over-current; superconducting-to-normal-conducting recovery; Critical current; Electromagnetic measurements; High temperature superconductors; Nitrogen; Power system transients; Soldering; Superconducting coils; Switching circuits; Time measurement; Voltage; /Ag tape; Bi-222; high-temperature super-conductor; quench recovery time;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/TASC.2004.830394

Filename

1324978