Hydraulic actuator for an electric circuit breaker

Details Hydraulic actuator for an electric circuit breaker Hydraulic actuator for an electric circuit breaker

1980-05-29

1983-05-17

Macon, Robert S.

Electricity: circuit makers and breakers

Fluid pressure

Piston

200148R, 200148F, H01H 3334, H01H 3538

Patent

active

043841821

ABSTRACT:
This actuator comprises a fluid motor having a piston, a breaker-opening space at one side of the piston, and a breaker-closing space at its opposite side. An accumulator freely communicates with the breaker-opening space for supplying pressurized fluid thereto during a circuit breaker opening operation. The breaker-opening space and the breaker-closing space are connected by an impeded flow passage. A pilot valve opens to allow the pressurized liquid in the breaker-closing space to flow to a back chamber of a normally closed main valve to cause the main valve to be opened during a circuit breaker opening operation to release the pressurized liquid from the breaker-closing space. An impeded passage affords communication between the back chamber and a sump located on the opposite side of the main valve from the back chamber. The pilot valve and impeded passage allow rapid opening of the main valve with pressurized liquid from the breaker closing side of the piston.

REFERENCES:
patent: 2740859 (1956-04-01), Beatty et al.
patent: 2765378 (1956-10-01), Perry et al.
patent: 3008017 (1961-11-01), Strom et al.
patent: 3748418 (1973-07-01), Kawasaki
patent: 3908106 (1975-09-01), Hirasawa et al.
patent: 4118613 (1978-10-01), Barkan et al.
patent: 4166937 (1979-09-01), Imam et al.

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