FIELD: furnaces.
SUBSTANCE: disclosed are an apparatus and method for process-based power regulation of electric arc furnace (10). Plurality of sensor types (15, 16, 17) detect presently active operating parameters of electric arc furnace (10) in dependence on time. From the measured values, control and regulating unit (30) determines the necessity of whether to switch other winding taps (TS1, …, TSN) of primary side (6P) of furnace transformer (6) by semiconductor tap changer (20) in order to effect a modified electrical power to prevent thermal and/or mechanical damages to electric arc furnace (10).
EFFECT: invention provides, when adjusting the power of the electric arc furnace, with changes in the process in the furnace, an impact with suitable time constants and while reducing downtime.
11 cl, 5 dwg
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