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US 4,288,668 AGranted
Circuit interrupter using a minimum of dielectric liquid
AssigneeElectric Power Research Institute, Inc.
InventorsWilliam H. Fischer, Charles F. Cromer, Joseph R. Rostron
Life of this patent
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Abstract
A minimum liquid circuit interrupter provides a relatively remote cooled storage unit for the dielectric liquid and fills a cylinder which is in close proximity to the insulating nozzle of the interrupter, the cylinder being driven at one end by a piston and closed at the other by the moving contact of the interrupter.
Claims7
A circuit interrupter using a minimum of dielectric liquid having a low critical temperature at which it becomes gaseous relative to ambient temperature comprising:
- fixed contact means;
- an electrical and thermal insulating nozzle having a nozzle throat and an aperture in the side wall of said nozzle;
- a movable contact normally inserted in said nozzle throat and into electrical contact with said fixed contact means, said movable contact normally closing said aperture;
- an insulated cylinder for containing a predetermined quantity of said liquid having one end connected to said aperture in said side wall of said nozzle and the other end to a pump piston;
- liquid storage means having a pressure above ambient pressure permanently connected to said cylinder by a pipeline for filling said cylinder with said liquid at a relatively slow rate including cooling means for said storage means for maintaining said liquid in said storage means, in said pipeline, and in said insulating cylinder below said critical temperature in its liquid phase;
- said moving contact which normally closes said aperture when withdrawn allowing said predetermined quantity of liquid to flow, in response to actuation of said pump piston, through said nozzle throat at a relatively high rate to extinguish any arc created by said withdrawal of said contact.
3 more elements
Dependencies are inferred from the claim text.