Liquid SF.sub.6 interrupter with arc energy driven piston and co

Details Liquid SF.sub.6 interrupter with arc energy driven piston and co Liquid SF.sub.6 interrupter with arc energy driven piston and co

1981-08-12

1984-02-28

Macon, Robert S.

Electricity: circuit makers and breakers

Liquid contact

Time delay

200148A, H01H 3388

Patent

active

044343361

ABSTRACT:
A liquid SF.sub.6 circuit interrupter is disclosed which employs only one moving piston, eliminating the need for tie rods used in conventional liquid dielectric interrupters to connect two pistons in tandem, which tie rods were possible paths for flashovers. The moving contact is mounted at one end of a movable piston device in the other end of which is formed a bore that fits over a stationary piston secured to the housing. The interior of the bore communicates with the remainder of the interior of the housing via holes adjacent the moving contacts. When the movable piston device is moved to open the interrupter, the compression of fluid in the interior of the bore causes it to flow through the holes and through the arc region. The movable piston device also includes a piston member having one face exposed to the liquid dielectric in the housing and having an opposite face exposed to a lower ambient pressure. A net force tending to bias the interrupter into the open position results. This force is increased during interruption due to heat absorbed by the dielectric liquid from the arc. The pressure generated and the total travel of the movable contact depend on the amount of heat absorbed, and are proportional to the current being interrupted.

REFERENCES:
patent: 4230920 (1980-10-01), Thaler

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