Vapor-cooled terminal-bushings for oil-type circuit-interrupters
US4123618A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 9, 1976 |
| Grant date | Oct 31, 1978 |
| Priority date | — |
| Expiry date | Jun 9, 1996 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01H2033/6613
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An improved vapor-cooled terminal-bushing is provided for increased current-carrying capacity, such as 6,000 amperes, for example, in an oil-type circuit-breaker, being provided with a "dry" body portion, utilizing resinous materials, such as epoxy-resin formulations, for example. Preferably, the body portion of resinous materials, such as epoxy resin, for example, is composite, or of a two-piece construction, having an inner first epoxy-resin formulation having improved dielectric strength, and an outer-disposed externally-located "petticoat"-type insulating second body portion, having weather-sheds, the second weather-shed annular body portion being preferably cast directly onto the inner high-dielectric-strength first epoxy-body portion, and having some flexibility for adherence purposes. An externally-located tubular metallic preferably finned heat-exchanger or cooling condenser, having a tubular central hub portion, constitutes an extension of the inner, elongated, tubular, high-voltage terminal-lead, which is partially filled with a low-boiling-point cooling liquid or refrigerant, such as "Freon-11", for example. A massive metallic line-terminal connector is affixed to the te…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.