Fluid actuating device for an electric circuit breaker

Details Fluid actuating device for an electric circuit breaker Fluid actuating device for an electric circuit breaker

1973-07-02

1976-07-20

Cohen, Irwin C.

Motors: expansible chamber type

Differential

Opposing pressure applied by bypassing

91417R, 91459, 91461, 13762564, 13762566, 200 82B, F15B 13043, F15B 1517, H01H 3538

Patent

active

039699854

ABSTRACT:
A fluid actuating device for an electric switching apparatus such as a high-voltage power circuit breaker or the like includes an actuator for actuating the switching apparatus. The actuator in turn is made up of a cylinder and an actuator differential piston movable in the cylinder between positions corresponding to the open and closed positions of the switching apparatus. A fluid supply provides fluid under high-pressure to the end-faces of the actuator differential piston. A main-valve arrangement includes a main-valve differential piston movable for alternately interrupting and connecting fluid from the fluid supply to one of the end-faces of the actuator differential piston whereby the actuator differential piston is caused to move between its end positions. The main-valve differential piston also has end-faces fluidly connected to the fluid supply. A control valve arrangement includes a control differential piston which interrupts and connects the fluid supplied to one of the end-faces of the main-valve differential piston thereby actuating the same. A control arrangement actuates the control differential piston in response to inputs for opening and closing the switching apparatus. The main-valve differential piston and the control differential piston are actuable exclusively by the pressure of the fluid from the fluid supply and this enables the two last-mentioned pistons to maintain their end positions independent of the instantaneous value of the pressure of the fluid.

REFERENCES:
patent: 2617444 (1952-11-01), Gardner
patent: 2900960 (1959-08-01), Gratzmuller
patent: 3008017 (1961-11-01), Strom et al.
patent: 3105126 (1963-09-01), Peek et al.
patent: 3131722 (1964-05-01), Abbott et al.
patent: 3208720 (1965-09-01), Huntington
patent: 3229958 (1966-01-01), Borel
patent: 3832502 (1974-08-01), Grieger et al.

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