The current status of superconducting fault current limiter development

Yoneda, Eriko; Tasaki, Kenji; Yazawa, Takashi; Maeda, Hideaki; Matsuzaki, Jun; Tsurunaga, Kazuyuki; Tada, Takamitsu; Fujisawa, A.; Ito, Daisuke; Hara, T.; Nakade, Masahiko; Ookuma, T.

doi:10.1016/s0011-2275(05)80176-6

Cited by 4 publications

(2 citation statements)

References 6 publications

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“…The limiting coil limits by its self-inductance; it may be superconducting or normal, but must not quench during a fault if superconducting. A 6.6 kV/1500 A device has been developed by Toshiba [6]. In this case, only a device with a low temperature superconductor has been studied.…”

Section: Superconducting Current-limiting Devicesmentioning

confidence: 99%

A new kind of superconducting current limiter

Lévêque

Rezzoug

2002

Supercond. Sci. Technol.

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This paper deals with a new kind of superconducting limiter. Usually, superconducting current limiters are based on the transition from superconducting state to the normal state by overtaking the critical current. This new superconducting current limiter has no current transport in the superconductor. Indeed, in our structure, the limitation is based on the saturation of a high temperature bulk superconductor by the magnetic flux. We show that our structure enables one to limit the current.

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Section: Superconducting Current-limiting Devicesmentioning

confidence: 99%

A new kind of superconducting current limiter

Lévêque

Rezzoug

2002

Supercond. Sci. Technol.

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“…In the non-fault mode, the SCFCL has zero impedance in a circuit. So far, we have developed a SCFCL AC coil which has a sufficient current capacity of 2kA [4]. Another important technical breakthrough for the SCFCL development is the reduction of AC loss of the coil.…”

Section: Introductionmentioning

confidence: 99%

AC loss reduction of a 6.6 kV superconducting fault current limiter

et al. 1996

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The authors have been investigating a 6 . 6 k V superconducting f a u l t c u r r e n t limiter (SCFCL) for use in power distribution systems. For practical application, heat load a t 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 dooble-twisted multi-filament NbTi strands in a high-resistivity CuNi matrix.T h e 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. I t was confirmed e s per i mental I y j unctions effectively reduced the loss. A total coil loss of 0.8 W a t 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. t h a t cy1 i nd r i cal -s h aped

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