Study on degradation of trigger current level of superconducting fault current limiter of transformer type

Author

Fujikawa, Kazuhiro ; Shirai, Yasuyuki ; Shiotsu, Masahiro ; NItta, Tanzo ; Hatta, Hiroyuki

Author_Institution

Dept. of Energy Sci. & Technol., Kyoto Univ., Japan

Volume

11

Issue

1

fYear

2001

fDate

3/1/2001 12:00:00 AM

Firstpage

2410

Lastpage

2413

Abstract

A superconducting fault current limiter (SCFCL) of a transformer type with adjustable trigger current level was proposed in previous works. Basic tests were performed using the trial SCFCL of proposed type. The degradation of the trigger current level of the SCFCL was observed. It is observed that the trigger current level depends on the frequency of the power source. The measured AC loss is about seven times as large as the calculated hysteresis loss and the coupling loss. It is assumed that an excessive loss generated at the short-circuit contact of the secondary winding causes the degradation. The new trial SCFCLs with the improved contact are made. The degradation of the trigger current level does not appear for the new trial SCFCLs

Keywords

current distribution; fault current limiters; loss measurement; power transformers; superconducting device testing; superconducting devices; transformer windings; AC loss measurement; coupling loss; hysteresis loss; secondary transformer winding; short-circuit contact; superconducting fault current limiter; trigger current level degradation; Degradation; Fault current limiters; Fiber reinforced plastics; Frequency; Multifilamentary superconductors; Power system transients; Superconducting coils; Superconducting filaments and wires; Superconducting materials; Testing;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/77.920348

Filename

920348