HYBRID GAS-BLAST CIRCUIT BREAKER FOR SWITCHGEAR WITH SF6 GAS INSULATION Russian patent published in 2014 - IPC H01H33/76 

FIELD: machine building.

SUBSTANCE: circuit breaker comprises fixed part with arc contact part, and moving part with cylinder. It incorporates piston fitted in cylinder, blow chamber and heat expansion chamber composed by separation wall. Besides, it includes working electrode extending through piston inner part and cylinder. Besides, moving part comprises arc contact part of moving part to be displaced right up to fixed part arc part. One side surface of separation wall is equipped with moving valve including tight-contact part and moving part. Tight-contact part is displaced by pressure difference and tightly pressed against the separation wall. Moving part extending from tight-contact part allows working electrode passage there through and expansion chamber opening/closure.

EFFECT: reliable arc quench with no gas pressure drop.

3 cl, 5 dwg