METHOD AND SYSTEM FOR AUTOMATICALLY CONTROLLING ELECTRIC MODE OF THREE-PHASED ORE-THERMAL FURNACE Russian patent published in 2007 - IPC H05B7/148 

FIELD: metallurgy, special area of electric engineering concerning electrical arc heating during forging of various alloys, namely - automatic control over current power and position of electrodes of ore-thermal furnaces.

SUBSTANCE: method and system for automatic control are meant for controlling ore-thermal furnace, which has one three-phased or three one-phased furnace transformers, tub with liquid alloy being forged and stock, in which electrodes are positioned, connected by bus packets to low side of transformer. Automatic control system used for realization of method consists of voltage and current meters on the side of high transformer voltage; voltage meters on electrodes of magneto-sensitive elements, connected to current sensor, mounted on low voltage side (further in short network) of transformer. Chains of voltage and current meters on the side of high voltage are connected to first complex parameter meter of three-phased network, while chains of voltage meter and current indicator of short network are connected to second three-phased network parameter meter. Chains of first and second three-phased network parameter meters are connected to programmable logical controller.

EFFECT: increased efficiency.

2 cl, 5 dwg