Electricity: circuit makers and breakers – Liquid contact – Time delay
Patent
1978-01-11
1981-03-10
Macon, Robert S.
Electricity: circuit makers and breakers
Liquid contact
Time delay
200146R, H01H 3318
Patent
active
042556317
ABSTRACT:
A circuit interrupter is described in which the arc current to be interrupted is rotated in a relatively static sulfur hexafluoride gas. The arc is rotated by a Lorentz force produced by the interaction of a magnetic field which has at least one component extending perpendicularly to the arc and the arc current. The magnetic field is the resultant field produced by the field of a coil which is in series with the arc current and the field of a circulating current which is induced in an arc runner disposed perpendicularly to the current path. The arc runner acts as a stationary arcing contact and has a general washer type shape, and the arc root circulates around one surface of the arc runner. The current path for bringing current from the coil, which is concentric with the arc runner, is connected to the outer diameter of the arc runner, so that the current must execute an inward bend, relative to the axis of the runner, before reaching the runner and then must execute a bend in the direction of the arc current. This then produces a magnetic force which is directed toward the axis of rotation of the arc current and of the interrupter. The arc current is then at a greater angle to the magnetic flux lines produced by the coil and by the circulating current induced in the arc runner, in the region closest to the arc runner where the field strength is the greatest. Thus, a higher Lorentz force is obtained for rotating the arc, and the arc current is prevented from being blown radially outwardly toward the main contacts where it could restrike across the separating contacts.
REFERENCES:
patent: 4032736 (1977-06-01), Ruffieux et al.
patent: 4052577 (1977-10-01), Votta
patent: 4086461 (1978-04-01), Gonek
patent: 4153827 (1979-05-01), Mircovich et al.
Gould Inc.
Macon Robert S.
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