Title :
Design and test results of 6.6 kV high-Tc superconducting fault current limiter
Author :
Yazawa, Takashi ; Yoneda, Eriko ; Matsuzaki, Jun ; Shimada, Mamoru ; Kuriyama, Toru ; Nomura, Shunji ; Ohkuma, Takeshi ; Sato, Yoshibumi ; Takahashi, Yoshihisa
Author_Institution :
Power & Ind. Syst. R&D Center, Toshiba Corp., Yokohama, Japan
fDate :
3/1/2001 12:00:00 AM
Abstract :
A 6.6 kV single-phase fault current limiter (FCL) using a high-Tc superconducting coil as a limiting coil was developed. The development is a preliminary step to investigate the feasibility of the FCL application for high-voltage transmission lines. The FCL is of the rectifier type and is mainly comprised of a limiting coil, a sub-cooled nitrogen cryostat with a cryocooler, and a rectifier bridge. The limiting coil, wound as a solenoid by Ag/Mn sheathed Bi-2223 tapes, has an inductance of 30 mH. It is immersed in a liquid nitrogen bath in the cryostat. A Gifford-McMahon cryocooler cools the cryogen below 77.3 K. A pressure regulator keeps the cryogen at an atmospheric pressure. The coil has a critical current of 70 A at 64 K and endures a 50 Hz overvoltage of 22 kV against the ground. In a fault current limiting test with a short-circuit generator, a short-circuit current of 12.5 kA was limited to 1.2 kA
Keywords :
AC-DC power convertors; bismuth compounds; calcium compounds; copper compounds; fault current limiters; high-temperature superconductors; lead compounds; manganese; rectifying circuits; short-circuit currents; silver; strontium compounds; superconducting coils; superconducting device testing; (BiPb)2Sr2Ca2Cu3O 10-Ag-Mn; 1.2 kA; 12.5 kA; 22 kV; 50 Hz; 6.6 kV; 64 K; 70 A; Gifford-McMahon cryocooler; critical current; design results; fault current limiting test; high-Tc superconducting coil; high-Tc superconducting fault current limiter; high-voltage transmission lines; limiting coil; rectifier bridge; rectifier-type fault current limiter; short-circuit current; short-circuit generator; single-phase fault current limiter; sub-cooled nitrogen cryostat; test results; Bridges; Fault current limiters; Inductance; Nitrogen; Rectifiers; Solenoids; Superconducting coils; Superconducting transmission lines; Testing; Wounds;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
