Hydraulic device for operating a drive piston for a moving component
AssigneeABB Patent GmbH
InventorHorst Plettner
Life of this patent
Estimating the term…
Abstract
A hydraulic device for a moving contact piece of a high-voltage power circuit breaker includes a reservoir and a low-pressure tank for hydraulic fluid. A changeover valve has a slide for alternately connecting one of the spaces in the drive-piston/cylinder configuration to the reservoir and to the low-pressure tank. At least one separately controlled and arranged control piston is associated with the slide. A servovalve controls the at least one control piston to drive the slide from a first position to a second position, i.e., from a connected position to a disconnected position of the power circuit breaker.
Claims4
In combination with a high-voltage power circuit breaker having a moving contact piece, a hydraulic device and a drive-piston/cylinder configuration having spaces formed therein and operated by said hydraulic device for actuating the moving contact piece of the high-voltage power circuit breaker, comprising:
- a reservoir and a low-pressure tank for hydraulic fluid;
- a changeover valve having a slide for alternately connecting one of the spaces in the drive-piston/cylinder configuration to said reservoir and to said low-pressure tank;
- at least one separately controlled and arranged control piston associated with said slide;
- a servovalve for controlling said at least one control piston to drive said slide and the contact piece of the power circuit breaker from a connected position to a disconnected position of the power circuit breaker;
- and
- said at least one control piston having a surface with a larger area and a surface with a smaller area, said larger area piston surface facing said slide of said changeover valve, and said larger area piston surface and said slide define a space therebetween connectible to said reservoir and connectible through said servovalve to said low-pressure tank.
In combination with a high-voltage power circuit breaker of the type having a moving contact piece which is selectively moved between a connected position in which the power circuit breaker is conducting and a disconnected position in which the power circuit breaker is interrupted,
- a hydraulic device and a drive-piston/cylinder configuration actuated by the hydraulic device for moving said contact piece between the connected and disconnected positions;
- said drive-piston/cylinder configuration comprising a piston and a cylinder having a plurality of spaces formed therein;
- said hydraulic device comprising a reservoir and a low-pressure tank for hydraulic fluid;
- a changeover valve connected between said reservoir, said low-pressure tank and said spaces of said piston/cylinder configuration,
- said changeover valve including a slide for alternately connecting one of said spaces in said drivepiston/cylinder configuration to said reservoir and to said low-pressure tank;
- a separately controlled and arranged control piston associated with said slide;
- a servovalve connected to and controlling said control piston to drive said slide from the connected position to the disconnected position of the power circuit breaker;
- and
- said control piston having a surface with a larger area and a surface with a smaller area, said larger area piston surface facing said slide of said changeover valve, and said larger area piston surface and said slide define a space therebetween connectible to said reservoir and connectible through said servovalve to said low-pressure tank.
Dependencies are inferred from the claim text.