Electrical switchgear

Details Electrical switchgear Electrical switchgear

1981-10-16

1984-04-24

Goldberg, E. A.

Electricity: circuit makers and breakers

Liquid contact

Time delay

200147R, H01H 3318

Patent

active

044450176

ABSTRACT:
Electrical switchgear comprises a first contact set composed of a first contact which is pivotable about a pivot axis and a second contact, the contacts being relatively movable between a closed position wherein a load current can be passed therethrough and an open position. An arc is formed between the first contact and an arcing electrode during movement of the contacts from their closed to their open position, whereupon current flows through a field coil connected in series with the electrode to produce a magnetic field which causes the arc to rotate and become extinguished. The pivot axis of the first contact extends transversely to a major axis of the field coil such that, during opening of the contacts, an end portion of the first contact moves transversely to and inwardly of said major axis. A second contact set is operable to earth the first contact set when its contacts are in their open position. Both the first and second contact sets are disposed in a common housing which contains an electrically insulating fluid.

REFERENCES:
patent: 3179762 (1965-04-01), Swinney
patent: 4031341 (1981-12-01), Parry

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