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Title: AC loss reduction of a 6.6kV superconducting fault current limiter

Abstract

The authors have been investigating a 6.6kV superconducting fault current limiter (SCFCL) for use in power distribution systems. For practical application, heat load at 4.2 K must be reduced to a level which can be compensated by a small refrigerator. This paper describes AC loss reduction of a SCFCL coil, which is comprised of a conductor and junctions. The conductor is a cable of double-twisted multi-filament NbTi strands in a high-resistivity CuNi matrix. The filament diameter in strands and the filament twist pitch were reduced for AC loss reduction. Current junctions made of copper generate eddy current loss because an alternating magnetic field is applied on them by the conductor. It was confirmed experimentally that cylindrical-shaped junctions effectively reduced the loss. A total coil loss of 0.8 W at 1 kA has been achieved, which value is sufficiently low for the development of a closed cryostat of superconducting fault current limiter compensated by a small refrigerator.

Authors:
; ; ; ; ;  [1]; ; ;  [2]
  1. Toshiba Corp., Kawasaki (Japan). Research and Development Center
  2. Tokyo Electric Power Co., Yokohama (Japan). Power Engineering R and D Center
Publication Date:
OSTI Identifier:
287654
Report Number(s):
CONF-950691-
Journal ID: IEMGAQ; ISSN 0018-9464; TRN: IM9639%%243
Resource Type:
Journal Article
Journal Name:
IEEE Transactions on Magnetics
Additional Journal Information:
Journal Volume: 32; Journal Issue: 4Pt1; Conference: 14. international conference on magnet technology, Tampere (Finland), 11-16 Jun 1995; Other Information: PBD: Jul 1996
Country of Publication:
United States
Language:
English
Subject:
24 POWER TRANSMISSION AND DISTRIBUTION; POWER DISTRIBUTION SYSTEMS; CURRENT LIMITERS; ELECTRICAL FAULTS; AC LOSSES; DESIGN; SUPERCONDUCTING DEVICES; SUPERCONDUCTING COILS; NIOBIUM ALLOYS; TITANIUM ALLOYS; SUPERCONDUCTING CABLES; PERFORMANCE

Citation Formats

Yazawa, Takashi, Tasaki, Kenji, Tosaka, Taizo, Kurusu, Tsutomu, Nomura, Shunji, Maeda, Hideaki, Ohkuma, Takeshi, Nakade, Masahiko, and Hara, Tsukushi. AC loss reduction of a 6.6kV superconducting fault current limiter. United States: N. p., 1996. Web. doi:10.1109/20.511356.
Yazawa, Takashi, Tasaki, Kenji, Tosaka, Taizo, Kurusu, Tsutomu, Nomura, Shunji, Maeda, Hideaki, Ohkuma, Takeshi, Nakade, Masahiko, & Hara, Tsukushi. AC loss reduction of a 6.6kV superconducting fault current limiter. United States. https://doi.org/10.1109/20.511356
Yazawa, Takashi, Tasaki, Kenji, Tosaka, Taizo, Kurusu, Tsutomu, Nomura, Shunji, Maeda, Hideaki, Ohkuma, Takeshi, Nakade, Masahiko, and Hara, Tsukushi. 1996. "AC loss reduction of a 6.6kV superconducting fault current limiter". United States. https://doi.org/10.1109/20.511356.
@article{osti_287654,
title = {AC loss reduction of a 6.6kV superconducting fault current limiter},
author = {Yazawa, Takashi and Tasaki, Kenji and Tosaka, Taizo and Kurusu, Tsutomu and Nomura, Shunji and Maeda, Hideaki and Ohkuma, Takeshi and Nakade, Masahiko and Hara, Tsukushi},
abstractNote = {The authors have been investigating a 6.6kV superconducting fault current limiter (SCFCL) for use in power distribution systems. For practical application, heat load at 4.2 K must be reduced to a level which can be compensated by a small refrigerator. This paper describes AC loss reduction of a SCFCL coil, which is comprised of a conductor and junctions. The conductor is a cable of double-twisted multi-filament NbTi strands in a high-resistivity CuNi matrix. The filament diameter in strands and the filament twist pitch were reduced for AC loss reduction. Current junctions made of copper generate eddy current loss because an alternating magnetic field is applied on them by the conductor. It was confirmed experimentally that cylindrical-shaped junctions effectively reduced the loss. A total coil loss of 0.8 W at 1 kA has been achieved, which value is sufficiently low for the development of a closed cryostat of superconducting fault current limiter compensated by a small refrigerator.},
doi = {10.1109/20.511356},
url = {https://www.osti.gov/biblio/287654}, journal = {IEEE Transactions on Magnetics},
number = 4Pt1,
volume = 32,
place = {United States},
year = {Mon Jul 01 00:00:00 EDT 1996},
month = {Mon Jul 01 00:00:00 EDT 1996}
}