Electrical behavior of Bi-2223/Ag tapes under applied alternating over-currents

Author

Yim, Seong-Woo ; Lim, Sung-Hun ; Kim, Hye-Rim ; Hwang, Si-Dole ; Kishio, Kohji

Author_Institution

Korea Electr. Power Res. Inst., Daejon, South Korea

Volume

15

Issue

2

fYear

2005

fDate

6/1/2005 12:00:00 AM

Firstpage

2482

Lastpage

2487

Abstract

As a study for the protection of HTS power machines operated under AC conditions, the electrical behavior of Bi-2223/Ag tapes with applied alternating over-currents was investigated. Using the HTS tape of 57 A I_c and 106 K T_c, we measured the V-I curves for the over-critical current region from 150 A_p to 507 A_p. From the experimental results, 3 matters were investigated. Firstly, using the resistance increase data obtained from the curves, quench development was analyzed as a function of the amplitude and duration of the applied currents. Secondly, to understand these phenomena in detail, we investigated the current distribution between the superconductor and the metal sheath in Bi-2223/Ag tape, applying the equivalent equations and data of V-I curves. Finally, we confirmed the relationship between the resistance and temperature generated by the over-critical current experimentally. As a result, we could find the optimal operating condition considering the protection of the HTS tape against the alternating over-current.

Keywords

bismuth compounds; calcium compounds; critical currents; high-temperature superconductors; lead compounds; powders; silver; strontium compounds; superconducting machines; superconducting tapes; superconducting transition temperature; 0.193 mm; 106 K; 150 to 507 A; 3.81 mm; 57 A; 77 K; AC conditions; Bi₂PbSr₂Ca₂Cu₃O₁₀-Ag; HTS power machines; V-I curves; applied alternating overcurrents; current distribution; electrical behavior; metal sheath; optimal operating condition; quench development; Conducting materials; Critical current; Current distribution; Current measurement; Electrical resistance measurement; High temperature superconductors; Protection; Superconducting cables; Superconducting films; Superconducting materials; Alternating over-current; Bi-2223/Ag tapes; protection of HTS machine; quench development;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/TASC.2005.847493

Filename

1440169