FIELD: electrical engineering. SUBSTANCE: control device has adaptive gain varying unit one of whose inputs is connected to output of comparison unit and other one, to output of three-phase rectifier of adaptive automatic current and voltage setting unit and output is connected through power amplifier to electrode displacement final element. Dispersion of active power introduced in furnace during operation is 6.9 MW2, root-mean-square deviation is 2.6 MW, variation coefficient is 7.4%, maximum active power utilization factor is 0.94. Specific power requirement for melting is 25-50 kW-h/t lower. EFFECT: improved performance characteristics and reduced power requirement of furnace.
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