US 5,095,183 AGranted

Gas-blast electrical circuit breaker

AssigneeMerlin Gerin

InventorsDenis Raphard, Maurice Perrin, Laurent Besnard, Jean-Yves Blanc

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Abstract

A pole-unit of a gas-blast electrical circuit breaker comprises a tranverse partition made of injected insulating plastic material which at the same time performs guiding of the movable contact which passes through it. The injected material part bears an O-ring ensuring tightness with the casing and a one-way check valve of gas flow orifices arranged in the transverse partition. The gas-blast piston securedly united to the movable contact is also made of injected material and it comprises housing and clipping means of the puffer nozzle securedly fixed to the piston. A scraper seal in the form of a split segment is housed in a circumferential groove arranged in the injected part of the piston. The electrical connection between the movable contact rod and a flexible current supply insert is achieved by a braided strip extending in the form of a half-loop in a transverse plane to the pole-unit.

Claims10

Dependent claims

A pole-unit for a medium voltage gas-blast circuit breaker using piston compression of a high dielectric strength gas comprising:

a sealed insulating casing of general cylindrical shape filled with said gas, said casing having a stationary contact and a movable contact coaxially arranged therein, said movable contact being mounted to slide in and out of contact with said fixed contact;
a piston supported by said movable contact;
and
a transverse subdividing partition comprising an insulating injected plastic material part tightly fitted within and held in place in said casing, said plastic material part having a central orifice through which said movable contact passes, guided by said plastic material part, and peripheral gas flow orifices equipped with one-way valve means, said peripheral gas flow orifices being located adjacent to said central orifice, said transverse subdividing partition confining with the piston a compressible volume, wherein a puffer gas is compressed to blow out an arc drawn when separation of said movable contact and said fixed contact occurs, said one-way valve means enabling entry of gas into the compressible volume freely through said transverse subdividing partition while simultaneously preventing the gas from escaping the compressible volume in a direction opposite of that entry.

1 more element

Dependencies are inferred from the claim text.