Laigang 50 T Eaf Electrode Regulator System Of Digital Transformation

The arc furnace electrode regulator is the electric furnace core control system. Through controlling the height of electrode to control the arc current enhances the electro smelting efficiency and protects the instrument. The Laiwu Steel Group Special Steel County 50 tons electric furnace electrode regulator is the analogous circuit plug-in unit type product at the beginning of 80 ages last century .because the primary device gets older and the damage is serious, which creates the system failure rate to be high and the smelting electricity consumes high. Therefore, carries on the digitization according to the technology advancement request to develop it.Through carries on the analysis of the electric furnace steel-making craft to have to have the electrode the impedance control and the guard electrode and the protection the wall and so on the function, through may obtain to the electrical system analysis must have overcurrent controller ,short-circuits controller and protects the breaker the function, through has carried on the analysis and the test discovery hydraulic valve existence to the hydraulic pressure machine capability deadband needs to make up.The paper refers to the control method of the Siemens analogous circuit type electrode regulator and divides the regulator into three mutually independent control units. Each unit is an impedance control system. The actual secondary voltage and the flame current passes through the examination and A/D transforms and then obtains actual resistance value by eliminating themselves. The impedance curve number correspond with the transformer position and the tune supposes definite value after the system adjustment and the minimum value defined and actual resistance value carries on the comparison and obtains adjustment deviation. Through the closed loop enlargement and the signal transforms and D/A, it controls the hydraulic valve movement to cause the electrode to rise and fall to adjust impedance to achieve the definite value. Under the certain voltage files it positions the electric current to achieve the definite value. The system also can implement the electrode protection, the transformer protection and wall protection and so on.