Electricity: circuit makers and breakers – Liquid contact – Time delay
Patent
1991-04-26
1992-10-13
Scott, J. R.
Electricity: circuit makers and breakers
Liquid contact
Time delay
200148B, 200148R, H01H 3388
Patent
active
051553139
ABSTRACT:
A medium tension circuit-breaker has a gastight insulating case filled with a gas having good dielectric properties. A semi-moving arcing contact is electrically connected to a first terminal and a moving contact is mechanically connected to a drive mechanism and electrically connected to a second terminal. The semi-moving arcing contact is connected to a piston movable in a blast volume delimited in particular by the inside wall of an insulating cylinder which is inside the case and by a first face of a blast nozzle. The piston receives thrust from a spring in which energy is stored when the circuit-breaker is in the engaged position. The circuit-breaker includes a thermal expansion volume delimited in particular by the inside wall of the cylinder, by a second face of the nozzle, and by a transverse partition through which the moving contact slides. When interrupting high currents, once the piston has completed its stroke in the direction of compression of the blast volume, the piston is prevented from moving back in the opposite direction.
REFERENCES:
patent: 4225762 (1980-09-01), Zuckler
patent: 4320270 (1982-03-01), Graf et al.
patent: 4327263 (1982-04-01), Sakurai et al.
patent: 4577073 (1986-03-01), Talpo
patent: 4950855 (1990-08-01), Bolongeat-Mobleu et al.
Dufournet Denis
Perret Michel
GEC Alsthom SA
Scott J. R.
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