Arc driven single pressure type circuit breaker

Details Arc driven single pressure type circuit breaker Arc driven single pressure type circuit breaker

1979-08-03

1981-07-14

Scott, James R.

Electricity: circuit makers and breakers

Liquid contact

Time delay

200148A, H01H 3388

Patent

active

042788609

ABSTRACT:
A sulfur hexafluoride interrupter structure uses sulfur hexafluoride at supercritical pressure and includes two spaced pistons of different diameters disposed on opposite sides of the contact arcing region. The pistons are connected to a source of biasing force such as a spring and assume a static position dependent on the opposing force of the spring and of the differential pressure on the pistons. During contact interruption the initial arc between the separating contacts produces a high pressure in the contact space which is transmitted to the differential pistons and causes the pistons to move quickly in order to move fluid through the separating contacts. The piston biasing spring is also charged as the movable contact moves toward a disengaged position. High pressure surges created due to the arc energy are thus absorbed during the opening operation and a considerable part of the operating force needed to open the contacts and to move fluid is derived from the arc energy.

REFERENCES:
patent: 3814883 (1974-06-01), Milianowicz
patent: 4011421 (1977-03-01), Thaler
patent: 4079218 (1978-03-01), Spiegel
patent: 4105880 (1978-08-01), Rapp et al.

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