Contact system for high-voltage power circuit breakers
US4027124A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 1, 1974 |
| Grant date | May 31, 1977 |
| Priority date | — |
| Expiry date | Aug 1, 1994 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01H33/7076
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.