Hydraulic device for a hydraulic drive for a high-tension circuit-breaker
AssigneeABB Patent GmbH
InventorHorst Plettner
Life of this patent
Estimating the term…
Abstract
A hydraulic device for a hydraulic drive for a high-voltage circuit-breaker includes a drive piston for a movable contact piece having two piston sides being in connection with a high-pressure reservoir in a closed condition and being acted upon by high-pressure fluid on both sides. For circuit-breaking, a switch-over valve releases a path to a low-pressure space for the fluid in the space with the larger piston area. At least one circuit-closing pilot valve and circuit-breaking pilot valve activate the switch-over valve. A settable delay volume for the fluid is connected in parallel with at least the at least one circuit-breaking pilot valve.
Claims8
In a hydraulic drive for a high-voltage circuit-breaker having a contact piece being movable between open and closed conditions, a drive piston for the movable contact piece having a side with a larger piston area disposed in one space and side with a smaller piston area disposed in another space,
- a hydraulic device for the hydraulic drive, comprising:
- a high-pressure reservoir being in connection with the two piston sides in the closed condition for acting upon both sides with high-pressure fluid;
- a low-pressure space;
- a switch-over valve releasing a path to said low-pressure space for the fluid in the space with the larger piston area for circuit-breaking;
- at least one circuit-closing pilot valve and circuit-breaking pilot valve for activating said switch-over valve;
- and
- a settable delay volume for the fluid being connected in parallel with at least said at least one circuit-breaking pilot valve.
Dependencies are inferred from the claim text.