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Design and test results of 6.6 kV high-Tc superconducting fault current limiter

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9 Author(s)
Yazawa, T. ; Power & Ind. Syst. R&D Center, Toshiba Corp., Yokohama, Japan ; Yoneda, E. ; Matsuzaki, J. ; Shimada, M.
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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

Published in:

Applied Superconductivity, IEEE Transactions on  (Volume:11 ,  Issue: 1 )