Method of electrode regulation of a DC arc furnace and electrode

Details Method of electrode regulation of a DC arc furnace and electrode Method of electrode regulation of a DC arc furnace and electrode

1994-12-29

1996-07-02

Hoang, Tu

Industrial electric heating furnaces

Arc furnace device

Power supply system

373105, 373108, H05B 7148

Patent

active

055330444

ABSTRACT:
DC arc furnaces have a current regulator for maintaining the current of an arc constant and an electrode regulator for affecting the position of an electrode of the arc furnace and thus the length of the are. Adjustment of the position of the electrode takes place by a hydraulic electrode adjustment device, which is controlled as a function of the difference between a predeterminable electrode regulator command variable signal and a voltage actual signal. The arc length is adjusted in such a way that a rectifier operates on the average with a deflection of, for example, 35.degree. el., independently of the secondary voltage of a furnace transformer and a set current set value. To be able to better protect the wall of the arc furnace and to better utilize the fed-in energy during operation with foaming slag, the arc length is automatically adapted to a slag height. The electrode regulator set value signal is calculated by a computer as a function of an arc field strength and a loudness signal which was detected by a loudness detector.

REFERENCES:
patent: 4435631 (1984-03-01), Drovet et al.
patent: 4607373 (1986-08-01), Bergman
patent: 4677643 (1987-06-01), Dicks
patent: 5155740 (1992-10-01), Ao et al.
patent: 5351267 (1994-09-01), Strebel

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