Contact system for high-voltage power circuit breakers

Details Contact system for high-voltage power circuit breakers Contact system for high-voltage power circuit breakers

1974-08-01

1977-05-31

Macon, Robert S.

Electricity: circuit makers and breakers

Liquid contact

Time delay

200148R, H01H 3312

Patent

active

040271242

ABSTRACT:
A contact system for high-voltage power circuit breakers which includes at least one stationary, hollow, nozzle-shaped contact, comprising an electrically conducting tube made from copper or copper alloy and a nozzle body of arc-resistant material, such as graphite which is joined to the tube at the end face thereof. In the closed position the stationary contact is surrounded by a movable, tubular switching member with resiliently supported contact elements. The nozzle body has a larger outside diameter in the region of the joint compared with the diameter of the tube. When the switching member is drawn across the joint, the larger diameter of the nozzle body results in an increased pressure being applied thereto by the resilient contact members. Because of the characteristics of graphite the increased pressure results in a reduction of the resistance of graphite thereby improving the commutation of electric current from the tube to the nozzle and reducing the tendency to arc.

REFERENCES:
patent: 3835274 (1974-09-01), Marin
patent: 3848101 (1974-11-01), Eberhard et al.
patent: 3855437 (1974-12-01), Goedecke et al.

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