Stability of a shorted Nb/sub 3/Sn coil cooled by a refrigerator for a magnetic shield type fault current limiter

Author

Onishi, T. ; Aizawa, Natsuki ; Yamagata, A. ; Nii, A. ; Shibuya, M.

Author_Institution

Hokkaido Univ. Sapporo, Japan

Volume

10

Issue

1

fYear

2000

fDate

3/1/2000 12:00:00 AM

Firstpage

845

Lastpage

848

Abstract

A stabilizing method for a shorted Nb/sub 3/Sn coil, which will be cooled by a refrigerator at around 10 K and be applied to a magnetic shielding body for a magnetic shield type fault current limiter, is proposed. The stabilizing method is realized by short-circuiting the terminals of the limiting coil through a semiconductor device and keeping the voltage across the Nb/sub 3/Sn coil constant. The stability is studied in a single layer Nb/sub 3/Sn coil operated in a constant AC voltage mode in liquid helium or helium gas. The method has shown to be quite effective for stabilization.

Keywords

cooling; fault current limiters; magnetic shielding; niobium alloys; stability; superconducting coils; superconducting devices; tin alloys; Nb/sub 3/Sn; constant AC voltage mode operation; magnetic shield-type fault current limiter; magnetic shielding body; refrigerator cooling; semiconductor device; shorted Nb/sub 3/Sn superconducting coil stability; stabilizing method; terminal short-circuit; Coils; Fault current limiters; Magnetic semiconductors; Magnetic shielding; Niobium; Refrigeration; Stability; Tin; Voltage;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/77.828363

Filename

828363