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US 4,475,018 AGranted
Puffer type gas circuit breaker
AssigneeMitsubishi Denki Kabushiki Kaisha
InventorsSatomi Arimoto, Hiroshi Kakeyama
Life of this patent
Estimating the term…
Abstract
The present invention relates to a puffer type gas circuit breaker wherein, in order to efficiently extinguish an electric arc struck when a movable arc contact is disengaged from a stationary arc contact, self-extinction by an arc extinguishing fluid in a gas storage chamber is performed conjointly with forced extinction by an arc extinguishing fluid in a puffer chamber, in accordance with the movement of the movable arc contact.
Claims5
A puffer type gas circuit breaker including a puffer chamber and a gas storage chamber and comprising:
- a stationary contact and a movable contact for carrying current;
- a stationary arc contact and a movable arc contact which are disengaged after opeining of the current-carrying contacts;
- a first nozzle and a second nozzle which are juxtaposed along a moving path of said movable arc contact;
- an arc extinguishing fluid in said puffer chamber being compressed in accordance with the disengaging movement of said movable arc contact, said arc extinguishing fluid being blown through said first nozzle against an electric arc struck at the time of the disengagement of said arc contacts;
- said gas storage chamber being separate from said puffer chamber which communicates with said second nozzle;
- and
- an arc extinguishing fluid in said gas storage chamber, a passage opened by the disengaging movement of said moveable arc contact to connect said fluid in said gas storage chamber with the fluid blown through said first nozzle for mixing said fluid, the mixed arc extinguishing fluid being blown through said second nozzle against the electric arc after said movable arc contact has moved a predetermined distance.
4 more elements
Dependencies are inferred from the claim text.