Arc extinguishing arrangement for gas blast type circuit breaker
AssigneeBBC Brown, Boveri & Company, Limited
InventorHeribert Maier
Life of this patent
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Abstract
An electrical circuit breaker of the gas blast type comprises a pair of contact members disposed within an arc quenching zone of a chambered part at which separation of the contact members takes place and an arc is established therebetween. An annular blast gas in-flow duct surrounds the arc quenching zone and through which the gas is forced by piston action in the direction of the quenching zone at the time of contact separation, and the discharge end of this in-flow duct includes a gas deflection zone for preventing blow-back of hot arc extinction gases formed in the quenching zone through the in-flow duct in the opposite direction thereby minimizing the chances of damage to the piston system.
Claims9
In an electrical circuit breaker of the gas blast type comprising a pair of contact members disposed within an arc quenching zone of a chambered part at which separation of the contact members takes place and an arc is established therebetween, the improvement wherein an annular blast gas in-flow duct surrounds said arc quenching zone and through which the gas is forced by piston action in the direction of said quenching zone, and the discharge end of said in-flow duct includes a gas deflection zone constituted by a fixed ring-shaped duct which lies at an acute angle to the axis of the quenching zone, said angle being in the range of from 45.degree. to 60.degree. for preventing blow-back of hot arc extinction gases formed in the quenching zone through said in-flow duct in the opposite direction.
In an electrical circuit breaker of the gas blast type having a pair of contact members, means mounting said contact members for movement along a common axis into and out of contact with each other, an arc quenching zone adjacent said contact members when in contact with each other, duct means surrounding said arc quenching zone, and means for pumping gas through said duct means to quench an arc in said arc quenching zone, the improvement comprising:
- a fixed deflection zone in said duct means, said deflection zone including an annular wall for directing gas toward said common axis at an acute angle with respect to said common axis and transverse to the arc drawn upon separation of said contact members.
In an electrical circuit breaker of the gas blast type having a pair of contact members, means mounting said contact members for movement along a common axis into and out of contact with each other, an arc quenching zone adjacent said contact members when in contact with each other, duct means surrounding said arc quenching zone, and means for pumping gas through said duct means to quench an arc in said arc quenching zone, the improvement comprising:
- a deflection zone in said duct means, said deflection zone including an annular wall for directing gas toward said common axis at an acute angle with respect to said common axis and transverse to the arc drawn upon separation of said contact members;
- and
- said duct means being defined by first and second nozzle members, said first nozzle member being annular and made of an insulating material, said second nozzle member being annular and located radially within said first nozzle member at a distance spaced therefrom to define said duct means.
Dependencies are inferred from the claim text.