Hydraulic drive for electrical switches

Details Hydraulic drive for electrical switches Hydraulic drive for electrical switches

1980-10-28

1982-08-10

Tolin, Gerald P.

Electricity: circuit makers and breakers

Fluid pressure

Flow-responsive type

200 82R, 91417R, 91459, 91461, H01H 3538

Patent

active

043439721

ABSTRACT:
A hydraulic drive for an electrical switch is disclosed including magnetically operated control signal organs for initiating closing and opening of the electrical switch which is hydraulically driven by a drive with a differential piston moving in a drive cylinder. A switch-over control valve is employed for selectively pressurizing and depressurizing a larger end face of the piston. In order to prevent "pumping" of the switch by such a switch drive system according to the present invention, the control signal organ which is opened in connection with the initiation of the closing of the switch is manipulated hydraulically at approximately the same time as the pressurization by the switch-over control valve of the larger piston end face of the differential piston of the drive commences. The hydraulic manipulation shifts the control signal organ back into a closed position. This arrangement permits at most only one on-off switching cycle to occur, and thus "pumping" of the switch is prevented.

REFERENCES:
patent: 3832502 (1974-08-01), Grieger
patent: 3999464 (1976-12-01), Grieger

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