Protection of superconducting AC windings

Author

Verhaege, T. ; Agnoux, C. ; Tavergnier, J.P. ; Lacaze, A. ; Collet, M.

Author_Institution

Alcatel Alsthom Recherche, Marcoussis, France

Volume

28

Issue

1

fYear

1992

fDate

1/1/1992 12:00:00 AM

Firstpage

751

Lastpage

754

Abstract

Protection schemes for superconducting AC windings are proposed which are applicable when the conductor is made up of several wires. Attention is first given to active protection, which involves ultrarapid 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 ms after detection, a fast circuit breaker switches off the current. Also considered is a complementary passive protection, which is provided by the resistance developing during normal phase propagation. This behavior naturally induces a certain amount of current reduction. Experimental results show how this effect can be magnified through an adequate definition of the superconducting and resistive wires assembled in the conductor

Keywords

coils; superconducting cables; transformer protection; transformer windings; active protection; circuit breaker; complementary passive protection; current reduction; phase propagation; superconducting AC windings; ultrarapid quench detection; unbalanced currents; Conductors; Copper; Current density; Protection; Resistance heating; Superconducting filaments and wires; Superconductivity; Switches; Temperature; Thermal conductivity;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.119988

Filename

119988