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US 4,935,590 AGranted
Gas-blast circuit breaker
AssigneeMerlin Gerin
InventorsPeter Malkin, Raymond V. Bresson, Paul Glenat, Jean-Claude Faye
Life of this patent
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Abstract
A puffer SF6 circuit breaker comprises a pair of separable contacts with formation of a breaking gap, a piston-cylinder assembly to compress the gas when the movable contact is actuated to the open position, and a puffer nozzle designed to channel the gas outflow to the breaking gap so as to cool the arc by forced convection. The nozzle is totally or partially made of transparent or translucent insulating material to allow a part of the energy to be removed by radiation.
Claims9
A gas-blast electrical circuit breaker comprising:
- a sealed casing filled with high dielectric strength insulating gas, notably sulphur hexafluoride,
- a pair of separable contacts having a stationary or semi-stationary contact, and a movable contact designed to be moved by an operating means between a closed position and an open position,
- a breaking gap with formation of an arc between the separated contacts,
- and a gas blast device capable of generating a gas outflow to the breaking gap to cool the arc by convection, wherein the gas-blast device comprises an insulating arc confinement wall, made of a material transparent or translucent to radiation of the arc.
1 more element
Dependencies are inferred from the claim text.