Hydraulically-actuated operating system for an electric circuit breaker

Patent · Sat Dec 31 23:00:00 EST 1977

OSTI ID:863202

Barkan, Philip ^[1]; Imam, Imdad ^[2]

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1. Media, PA
2. Secane, PA

This hydraulically-actuated operating system comprises a cylinder, a piston movable therein in an opening direction to open a circuit breaker, and an accumulator for supplying pressurized liquid to a piston-actuating space within the cylinder. A normally-closed valve between the accumulator and the actuating space is openable to allow pressurized liquid from the accumulator to flow through the valve into the actuating space to drive the piston in an opening direction. A vent is located hydraulically between the actuating space and the valve for affording communication between said actuating space and a low pressure region. Flow control means is provided for restricting leakage through said vent to a rate that prevents said leakage from substantially detracting from the development of pressure within said actuatng space during the period from initial opening of the valve to the time when said piston has moved through most of its opening stroke. Following such period and while the valve is still open, said flow control means allows effective leakage through said vent. The accumulator has a limited capacity that results in the pressure within said actuating space decaying promptly to a low value as a result of effective leakage through said vent after the piston has moved through a circuit-breaker opening stroke and while the valve is in its open state. Means is provided for resetting the valve to its closed state in response to said pressure decay in the actuating space.

• DOE Contract Number: EX-76-C-01-2065
• Assignee: General Electric Company (Philadelphia, PA)
• Patent Number(s): US 4118613
• OSTI ID: 863202
• Country of Publication: United States
• Language: English

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