Oil circuit-breaker pump-assembly with improved shunting contact structure
US4093837A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 31, 1975 |
| Grant date | Jun 6, 1978 |
| Priority date | — |
| Expiry date | Jul 31, 1995 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01H33/92
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An improved oil-pumping piston-assembly is provided for an oil-type circuit-interrupter to improve the interrupting performance during low-current conditions, having an improved hydraulic-dashpot action occurring during charging and discharging oil, incorporating, additionally, a "floating" piston design, and reducing the mechanical impulse forces exerted on the cylinder when high-current interruptions are made with an improved check-valve construction. The improved oil-pumping piston-assembly of the present invention is particularly adapted for the inclusion therewith of an auxiliary shunting separable-contact structure, which will, when desired, increase the current-carrying capability of the circuit-interrupter. Its inclusion, or exclusion, is optional, depending upon the current rating desired by the utility customer. Also, the improved oil-pumping piston-assembly provides an improved check-valve construction, which will admit clean oil into the pumping cylinder from the clean-oil region externally of the grid structure, by an improved check-valve structure located at a position between the pumping-cylinder reservoir and the lower end of the pumping housing, through which oil i…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.