Protection of superconducting AC windings

Conference · Wed Jan 01 00:00:00 EST 1992 · IEEE Transactions on Magnetics (Institute of Electrical and Electronics Engineers); (United States)

OSTI ID:5362753

Verhaege, T; Agnoux, C; Tavergnier, J P ^[1]; Lacaze, A ^[2]; Collet, M ^[3]

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1. Alcatel Alsthom Recherche, Route de Nozay, 91460 Marcoussis (FR)
2. GEC Alsthom-Dea, 3, avenue des Trois Chenes, 90018 Belfort (FR)
3. GEC Alsthom-DTDE, 130, rue Leon Blum, 69611 Villeurbanne (FR)

Recent progresses on multifilamentary wires open new prospects of 50-60 Hz applications for superconductivity. The problem of AC windings protection is more critical than that of DC windings, because of high current densities, and of high matrix resistivity: one should not allow the quenched wire to carry it nominal current for longer than a few milliseconds, otherwise permanent damage could occur. After a quench initiation, the protection system therefore has to switch off or drastically reduce the current very rapidly. In this paper, the authors propose various schemes, applicable when the conductor is made of several wires: active protection involves an ultra-rapid quench detection. It is based on the measurement of the current passing through the central resistive wire, and/or of unbalanced currents in the different superconducting wires. About 20 milliseconds after detection, a fast circuit-breaker switched off the current. A complementary passive protection is provided by the resistance developing during normal phase propagation.

• OSTI ID: 5362753
• Report Number(s): CONF-910662-; CODEN: IEMGA
• Journal Information: IEEE Transactions on Magnetics (Institute of Electrical and Electronics Engineers); (United States), Vol. 28:1; Conference: 12. international conference on magnet technology, Leningrad (USSR), 23-28 Jun 1991; ISSN 0018-9464
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
24 POWER TRANSMISSION AND DISTRIBUTION
AC SYSTEMS
CIRCUIT BREAKERS
SUPERCONDUCTING CABLES
CURRENT DENSITY
MAGNETIC INSULATION
SUPERCONDUCTING COILS
TECHNOLOGY UTILIZATION
CRITICAL CURRENT
DESIGN
DYNAMICS
EXPERIMENTAL DATA
PLANNING
QUENCHING
SUPERCONDUCTING WIRES
CABLES
CONDUCTOR DEVICES
CURRENTS
DATA
ELECTRIC CABLES
ELECTRIC CURRENTS
ELECTRICAL EQUIPMENT
EQUIPMENT
EQUIPMENT PROTECTION DEVICES
INFORMATION
MECHANICS
NUMERICAL DATA
POWER SYSTEMS
WIRES
665412* - Superconducting Devices- (1992-)
665411 - Basic Superconductivity Studies- (1992-)
240302 - Power Transmission Lines & Cables- Superconducting Cables- (1990-)
240100 - Power Systems- (1990-)