FIELD: electrometallurgy. SUBSTANCE: unit contains electric arc furnace with conducting hearth and furnace electrodes located at the top. Furnace electrodes are provided with contact cheeks. Unit is also provided with transformers with voltage vectors of secondary windings shifted through 60n (n = 2,3,4...) electrical degrees relative to each other. Unit is provided with six-pulse rectifiers and reactors which form pairs of supply sources; unit contains also control modules of rectifiers and voltage stage selector switches. Outputs of opposite polarity of power supply source are connected with furnace electrodes and conducting hearth. EFFECT: improved technical-and-economical indices. 5 cl, 2 dwg
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