DEVICE FOR CONTROLLING ELECTRIC MODE OF DC ELECTRIC ARC STEEL MELTING FURNACE

摘要

FIELD: electric engineering. SUBSTANCE: device has current intensity setting unit 5, which is used for setting load current arise speed to be correspondent to speed of hoist of furnace electrode from the bottom, which is provided by electrode movement control unit 18. In this case, growth of load current begins only when current detector 11 and voltage transducer 12 detect some initial arc current and voltage. Signal from these units connects unit 5 for setting current intensity to current setting unit 3 with larger value of setting signal; units 11 and 12 are connected to units 3 and 5 through comparators 13, 16 and AND gate 14 and switch 4. EFFECT: productivity of the furnace. 1 dwg