Electricity: circuit makers and breakers – Liquid contact – Time delay
Patent
1975-07-31
1978-06-06
Macon, Robert S.
Electricity: circuit makers and breakers
Liquid contact
Time delay
200150R, 200 34, H01H 3392
Patent
active
040938379
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 inlet passages are provided for the entrance of such clean oil into the pumping cylinder.
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Bohinc Richard J.
Racki Francis R.
Tragesser Charles W.
Vaill Ronald E.
Crout W. R.
Macon Robert S.
Westinghouse Electric Corp.
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