Electricity: circuit makers and breakers – Liquid contact – Time delay
Patent
1975-09-02
1977-10-04
Macon, Robert S.
Electricity: circuit makers and breakers
Liquid contact
Time delay
200146R, 200148B, 200144B, H01H 3318
Patent
active
040525767
ABSTRACT:
A single pressure sulfur hexafluoride circuit interrupter is contained in a bottle or elongated, cylindrical housing filled with gas under moderate pressure. The bottle contains arcing and main contacts arranged generally along the axis of the bottle and arranged to separate from one another in the vicinity of a pair of spaced, conductive rings fixed relative to one another, and which serve as arc runners. Each of the rings is connected in series with a respective coil which is wound on the axis of its respective ring and which encircles the cooperating contact and conductors therefor. The coils and the conductive rings create a magnetic field which spins an arc drawn between the spaced short-circuited rings through the sulfur hexafluoride gas, thereby to extinguish the arc. Each short-circuited ring and its respective coil are fixed relative to one another and are contained within a common insulation body in order to withstand the high electrodynamic forces created between the rings and coils during high current interruption. A small, low capacity puffer cylinder is connected to one of the moving contacts in order to produce at least a limited amount of gas motion through the arc space between the open contacts and the fixed rings when the contacts separate. The arcing contacts are arranged to have a blow-off path directed to cause an arc drawn between the contacts to transfer to the spaced conductive rings. In one embodiment of the invention, only a single coil is used to produce a magnetic field for spinning the arc between the spaced rings. The interrupter structure is useful in connection with a vacuum dielectric medium. Other embodiments of the invention show different forms of arcing contacts and different arrangements for introducing the spaced conductive rings into the circuit during interruption conditions. In another embodiment of the invention, a single conductive ring with a single coil cooperates with the movable contact. In still another embodiment of the invention, the conductive rings which form a gap within which the arc is circulated also serve as movable arcing contacts and are movable relative to one another.
REFERENCES:
patent: 1827940 (1931-10-01), Greenwood
patent: 2140378 (1938-12-01), Biersmanns et al.
patent: 3210505 (1965-10-01), Porter
patent: 3551625 (1970-12-01), Fischer
patent: 3555223 (1971-01-01), Robinson et al.
patent: 3858015 (1974-12-01), Deno
patent: 3891896 (1975-06-01), Clason
patent: 3914568 (1975-10-01), Crouch et al.
I-T-E Imperial Corporation
Macon Robert S.
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