AC loss reduction of a 6.6kV superconducting fault current limiter

Journal Article · Mon Jul 01 04:00:00 EDT 1996 · IEEE Transactions on Magnetics

DOI:https://doi.org/10.1109/20.511356· OSTI ID:287654

Yazawa, Takashi; Tasaki, Kenji; Tosaka, Taizo; Kurusu, Tsutomu; Nomura, Shunji; Maeda, Hideaki ^[1]; Ohkuma, Takeshi; Nakade, Masahiko; Hara, Tsukushi ^[2]

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1. Toshiba Corp., Kawasaki (Japan). Research and Development Center
2. Tokyo Electric Power Co., Yokohama (Japan). Power Engineering R and D Center

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.

• OSTI ID: 287654
• Report Number(s): CONF-950691--
• Journal Information: IEEE Transactions on Magnetics, Journal Name: IEEE Transactions on Magnetics Journal Issue: 4Pt1 Vol. 32; ISSN IEMGAQ; ISSN 0018-9464
• Country of Publication: United States
• Language: English

Related Subjects

24 POWER TRANSMISSION AND DISTRIBUTION
AC LOSSES
CURRENT LIMITERS
DESIGN
ELECTRICAL FAULTS
NIOBIUM ALLOYS
PERFORMANCE
POWER DISTRIBUTION SYSTEMS
SUPERCONDUCTING CABLES
SUPERCONDUCTING COILS
SUPERCONDUCTING DEVICES
TITANIUM ALLOYS