Direct-arc electric furnace fed with controlled current and meth

Details Direct-arc electric furnace fed with controlled current and meth Direct-arc electric furnace fed with controlled current and meth

1990-11-15

1993-08-24

Reynolds, Bruce A.

Industrial electric heating furnaces

Arc furnace device

Power supply system

373104, 373105, 373106, 373108, H05B 7144

Patent

active

052395545

ABSTRACT:
Method to feed a three-phase direct-arc electric furnace with controlled current and also a three-phase electric furnace thus fed for the smelting of metals, e.g. iron-based alloys, the furnace comprising means (GI) for regulation of the length of the arc by means of action on the height of the electrodes, the mains supply of the furnace including at least one medium voltage line and a transformer to serve the arc furnace, an element to regulate the arc current being comprised in each phase in the segment connecting the medium voltage line and the transformer and consisting of at least one inductor (L1), a thyristor-controlled valve (T) or alternatively a regulation element consisting of a saturable reactor being included in parallel with at least part of the inductor, one or the other of these regulation elements cooperating with a device (s1) to measure the intensity of the arc current and with an assembly (GC) that controls the arc current of the furnace by means of action on the overall value of the equivalent series reactance. The method includes feeding current to the furnace through the mains supply and varying the value of a series reactance of the segment connecting the medium voltage line and the transformer.

REFERENCES:
patent: 2632862 (1953-03-01), Stoltz
patent: 3617595 (1971-11-01), Mulcahy
patent: 3650311 (1972-03-01), Fritsche
patent: 3952138 (1976-04-01), Nanjyo et al.
patent: 4461010 (1984-07-01), Titus
patent: 4586187 (1986-04-01), Hein et al.
patent: 4607373 (1986-08-01), Bergman
patent: 4607374 (1986-08-01), Ingaki et al.

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