Alsthom-Atlantique

Doan P Van

Edmond Thuries

Michel Perret

Dante Nicoloso

Bernard Joyeux-Bouillon

Marcel Besson

Pierre-Paul Sigward

A pneumatic puffer circuit breaker for high tension stations comprises a sealed chamber filled with a highly dielectric gas, a fixed main contact (18, 39) and at least one fixed arcing contact (9, 14, 16) disposed as co-axial cylinders and deliminiting a first volume (12). A fixed blast nozzle (24) delimits in conjunction with the fixed arcing contact an outlet passage (12A) for gas from said first volume (12). A tubular moving main contact (29) and a tubular moving arcing contact (15) are disposed coaxially with each other and with the fixed contacts, and a cylinder (10) is mounted to co-operate with the fixed main contact during circuit interruption to compress the gas in said first volume. Said cylinder has a spring (11) urging it towards a drive member (20, 31) mounted to move with said moving contacts. The cylinder includes latching means (19) for preventing the cylinder from moving, during a circuit interruption operation, in a direction other than that which tends to compress the gas in said first volume. The purpose of said latching means is to prevent back pressure from an energetic arc pushing back the cylinder, thereby creating suction instead blast from said first volume.

Pneumatic puffer circuit breaker

The invention relates to a compressed gas circuit-breaker with a tubular stationary contact, a tubular moving contact, a device for inserting a resistance when the circuit-breaker closes, the insertion device and the resistance being disposed in a coaxial casing, said device being controlled by the moving contact of the circuit-breaker, the insertion device (19) being of the semi-mobile type and having a first means (51, 52) for damping its closing and a second means (50, 44) for delaying its opening when the circuit-breaker opens, wherein the first means (51, 52) and the second means (50, 44) are of the type which operate by pressure reduction. Application to circuit-circuit breakers which equip very high tension lines.

Compressed gas circuit-breaker

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Meyzieu, France

Doan P Van