Industrial electric heating furnaces – Arc furnace device – Power supply system
Patent
1985-07-09
1987-06-30
Envall, Jr., Roy N.
Industrial electric heating furnaces
Arc furnace device
Power supply system
373106, H05B 7148, H05B 7156
Patent
active
046776435
ABSTRACT:
Operation control system for an electrothermal furnace having one or more electrode and a transformer unit for each electrode for supplying heating current to its associated electrode. The or each transformer unit includes a main transformer having a primary winding for receiving current from a mains and two secondary windings, and an additional transformer connected to derive an adjustable voltage from one of the second secondary windings. The adjustable voltage and the voltage across the other secondary winding of the main transformer are combined to supply the heating current to the electrode. The control system includes a switch and a current control unit connected in the transformer unit for giving the additional voltage a selected polarity relative to the voltage across the other secondary winding of the main transformer and for controlling the magnitude of the additional voltage. The system is initially controlled by a microprocessor, to bring the electrode current into a normal operating range, and is then controlled to maintain a desired electrode voltage and the desired operating current.
REFERENCES:
patent: 3493664 (1970-02-01), Kopell
patent: 3597518 (1971-08-01), Roberts
patent: 4324944 (1982-04-01), Weihrich
patent: 4349912 (1982-09-01), Bello
Envall Jr. Roy N.
Licentia Patent-Verwaltungs-GmbH
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