Gas insulated high-voltage circuit breaker with pneumatic operating mechanism
AssigneeMerlin Gerin
InventorMario Lissandrin
Life of this patent
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Abstract
A high-voltage circuit breaker includes a first compartment with SF6 under pressure having stationary and movable contacts therein, and a second sealed compartment housing having an operating mechanism with a pneumatic jack actuated by the gas contained in the first compartment via closing and opening valves. The second sealed enclosure is at low pressure playing the role of expansion volume of the gas expelled from the jack at the end of travel of the piston. The gas pressure in the jack is controlled by means of a control device sensitive to the temperature variation of the gas under pressure in the first compartment.
Claims11
A high-voltage gas-insulated circuit breaker, comprising:
- a first sealed compartment filled with a high dielectric strength insulating gas at a first pressure, said first sealed compartment housing at least one breaking pole comprising stationary and movable contacts;
- an arc extinguishing device housed within said first sealed compartment for extinguishing an arc formed between said stationary and movable contacts upon separation thereof;
- a contact actuating rod coupled to said movable contact, said contact actuating rod extending longitudinally axially inside said first sealed compartment;
- a second sealed compartment fixed to an end of said first sealed compartment and separated therefrom by a separating wall, said second sealed compartment filled with said high dielectric strength insulating gas at a second pressure which is lower than said first pressure;
- a pneumatic operating mechanism disposed within said first sealed compartment and coupled to said contact actuating rod, said pneumatic operating mechanism comprising a fixed cylinder and a piston coupled to said contact actuating rod, said piston being able to be slidably driven within said fixed cylinder by flow of said insulating gas from said first sealed compartment into said fixed cylinder;
- a first distribution means disposed within said second compartment and at one end of said fixed cylinder to allow flow of said insulating gas from said first compartment into said fixed cylinder to drive said piston in a first direction;
- and
- a second distribution means disposed within said second compartment and at an opposite end of said fixed cylinder to allow flow of said insulating gas from said first compartment into said fixed cylinder to drive said piston in a second direction;
- wherein said insulating gas flowed into said fixed cylinder is expelled therefrom into said second sealed compartment after said piston is driven in said first direction or said second direction, said second sealed compartment thereby providing an expansion volume for said insulating gas expelled from said fixed cylinder.
Dependencies are inferred from the claim text.