Contact system for high-voltage power circuit breakers
A contact system for high-voltage power circuit breakers is described that 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.
- Assignee:
- Siemens AG
- Patent Number(s):
- US 4027124
- OSTI ID:
- 7105648
- Resource Relation:
- Patent Priority Date: Priority date 2 Aug 1973, German, Federal Republic of (F.R. Germany)
- Country of Publication:
- United States
- Language:
- English
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