Three-phase switchgear
AssigneeSiemens Aktiengesellschaft
InventorsJohann Bauer, Joachim Hannich, Werner Harbauer
Life of this patent
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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.
Claims7
A switchgear apparatus of the type having at least three switching gaps for interconnecting three electrical phases, each switching gap having at least an associated movable contact and a substantially fixed contact, each of the switching gaps further having a predetermined open state spacing between the movable and substantially fixed contacts when said switchgear apparatus is in an open state, the switchgear apparatus further comprising means associated with a selected one of the switching gaps for altering the predetermined open state spacing of the movable and substantially fixed contacts associated with said selected one of the switching gaps so that the associated contacts close earlier than the contacts associated with the other switching gaps during a closure cycle of the switchgear apparatus, and open later than the contacts associated with the other switching gaps during an opening cycle of the switchgear apparatus.
Dependencies are inferred from the claim text.