Method to control the power supply for electric arc furnaces

Details Method to control the power supply for electric arc furnaces Method to control the power supply for electric arc furnaces

1998-07-30

1999-11-16

Hoang, Tu Ba

Industrial electric heating furnaces

Arc furnace device

Power supply system

373102, 364550, H05B 7148

Patent

active

059870524

ABSTRACT:
Method to control the power supply for electric arc furnaces, whether they be fed with AC or DC, the furnaces including a melting cycle which includes the loading of the scrap carried out at time T.sub.0, an initial step of pre-melting the scrap with low and average power with a duration of (T.sub.1 -T.sub.0), a step of melting at maximum power with a duration of (T.sub.2 -T.sub.1) and a refining step with a duration of (T.sub.3 -T.sub.2), the method including the dynamic identification of the approximate moment when situations of risk inside the furnace cease, with a consequent permission to start delivery of maximum power, the dynamic identification being governed by the control and analysis of the electrical quantities, tension and current, fed to the furnace.

REFERENCES:
patent: 3909242 (1975-09-01), Skreien
patent: 4852119 (1989-07-01), Montgomery
patent: 4881239 (1989-11-01), Stenzel et al.
patent: 5099438 (1992-03-01), Gulden, Jr. et al.
Timm et al "Rechnergestutzte Prozessbeobachtung des Schmelzvorganges", Feb. 1987, Germany, pp. 26-36, Elektrowaerme International, Edition B.
Staib et al "The intelligent arc furnace controller: a neural network electrode position", IJCNN International Joint Conference (Maryland, USA 711 Jun. 1992, IEEE, pp. 1-9, vol. 3.

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