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Abstract

The RFX toroidal field power supply comprises a large 4.8MJ (max) modular capacitor bank and four 14 MW AC/DC converter flat-top power supply modules. The high fault level associated with the capacitor banks presents a problem in the design of the switching system, since mistiming could produce large currents in the flat-top supplies. The poloidal circuit consists of four groups of magnetising windings connected in series, each with its own flat-top convertor supply and opening switch transfer system. The flat-top converter supplies are needed when the transfer voltage has fallen from approximately 40kV to 1kV. Solutions to the problem of designing a fault- tolerant system which presents no danger to the flat-top converters are described in this paper. The adopted methods make use of hybrid ignition/mechanical switches to give the required combination of switching speed and current-carrying capacity, together with careful attention to the circuit layout of different switching elements.

Additional information

Authors: BROWNING J L, CULHAM LABORATORY, ABINGDON (UK);GRAY J W, CULHAM LABORATORY, ABINGDON (UK);MACE T A, CULHAM LABORATORY, ABINGDON (UK);VARLEY G L CULHAM LABORATORY, ABINGDON (UK), CULHAM LABORATORY, ABINGDON (UK)
Bibliographic Reference: 14TH SOFT CONFERENCE, AVIGNON (FRANCE), SEPT. 8-12, 1986 VOL. 1, PP. 841-846 1895 P., 1986, VOL. 1 AND VOL. 2, ISBN 0 08 034935 8 WRITE TO PERGAMON PRESS, HEADINGTON HILL HALL, OXFORD, OX3 0BW (UK), PRICE: UKL 220 (FOR BOTH VOLS.)
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