METHOD FOR CONTROLLING ELECTRIC CURRENT AND VOLTAGE OF STEEL-MAKING ARC FURNACE Russian patent published in 1999 - IPC

FIELD: electrothermics; optimizing smelting process and automatic control of arc furnaces. SUBSTANCE: electrical characteristics of arc, lining coefficient of radiation, batch density, and power requirement are checked during smelting process; specific power requirement for 1 ton of charge is set for each smelting process stage and as soon as preset value is attained, further control of furnace electrical conditions is passed to setting power controller. Desired power consumption is determined at each smelting process stage according to tg g ratio proportional to mass of charge smelted during particular process stage; current setting on power controller is not to exceed permissible current through electrodes. EFFECT: improved furnace capacity due to adequate selection of furnace current and voltage. 3 dwg, 1 tbl