Industrial electric heating furnaces – Arc furnace device – Power supply system
Patent
1991-12-02
1993-10-19
Reynolds, Bruce A.
Industrial electric heating furnaces
Arc furnace device
Power supply system
373102, 373104, 373106, H05B 7148
Patent
active
052552853
ABSTRACT:
A feedback control system for the impedance control of an electric arc furnace having at least one electrode, a hydraulic electrode actuator for adjusting the electrode. The actuator is adapted to be supplied with hydraulic fluid through a control valve. The furnace further includes a controller, which is connected to the valve actuator for the control valve, and impedance signal generator for delivering impedance signals to one input of the controller and a setpoint signal generator for delivering a setpoint signal representing a desired impedance to another input of the controller. In order to prevent non-permissible electrode oscillations in such a feedback control system it is proposed to provide a correcting stage for correcting the controller gain and to provide a correcting signal generator for delivering to the correcting stage a signal which represents the controlled-system gain and which causes the correcting stage to change the controller gain in a sense which is opposite to a detected change of the controlled-system gain.
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Aberl Heinrich
Rubenzucker Franz
Hoang Tu
Reynolds Bruce A.
Voest-Alpine Industrieanlagenbau Gesellschaft m.b.H.
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