Three-phase switchgear

Details Three-phase switchgear Three-phase switchgear

1982-09-28

1984-09-11

Hartary, Joseph W.

Electricity: circuit makers and breakers

Liquid contact

Time delay

200145, 200146R, H01H 930

Patent

active

044711832

ABSTRACT:
A switchgear apparatus having three switching gaps with contacts arranged thereacross for connecting three-phase electrical power to a consumer. Apparatus is described whereby a selected one of the switching gaps closes earlier than the other switching gaps during a closing cycle of the switchgear, and opens later than the other switching gaps during an opening cycle of the switchgear. The contacts across the early closing and late opening gap experience only minimal contact burnoff, thereby permitting a substantially reduced volume of contact overlay material to be provided therefor. In addition, less expensive contact material may be utilized for this contact.

REFERENCES:
patent: 2411894 (1946-12-01), Peters
patent: 2882372 (1959-04-01), Preissler
patent: 3873797 (1975-03-01), Hannich
patent: 4000480 (1976-12-01), Gray et al.

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