Application of Resistive Type SFCL to Protect Bi-2223/Ag Tape Against AC Over-Currents

Author

Yim, Seong-Woo ; Sohn, Song-Ho ; Hwang, Si-Dole ; Hyun, Ok-Bae ; Lim, Sung-Hun ; Kishio, Kohji

Author_Institution

Korea Electr. Power Res. Inst., Daejon

Volume

16

Issue

2

fYear

2006

fDate

6/1/2006 12:00:00 AM

Firstpage

699

Lastpage

702

Abstract

Based on the electrical behavior of Bi-2223/Ag tape in transient state, the possibility of SFCL application was investigated as a fundamental study for the protection of HTS power apparatus. For the experiments, the Bi-2223/Ag tape having the critical current of 56 A and the resistive type SFCL fabricated using three elements of YBCO thin films were examined. When the applied current exceeds the rated current of the SFCL, the current was limited to sufficiently low level, however, higher than 40 Vrms was not allowed considering power density of SFCL. On the other hand, as a method to increase the power density, a shunt resister across the SFCL was adopted to increase the allowed power density. In this case, the results showed that the over current was limited below the safe range for HTS tape and the SFCL was safe, although 100 V_rms was applied to the circuit. In conclusion, the switching power capacity of a SFCL could be increased by using a shunt resistor, and HTS tape could be protected safely within the quench margin

Keywords

bismuth compounds; critical currents; fault current limiters; high-temperature superconductors; overcurrent protection; power apparatus; resistors; superconducting tapes; superconducting thin films; 56 A; AC over-current protection; Bi-2223-Ag tape; HTS power apparatus protection; HTS wire; YBCO thin film; critical current; power density; resistive type SFCL; shunt resistor; transient state; Circuits; Conductors; Critical current; Fault currents; High temperature superconductors; Protection; Superconductivity; Transistors; Voltage; Yttrium barium copper oxide; HTS wire; SFCL; quench protection; switching power capacity;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/TASC.2006.871265

Filename

1642944