Industrial electric heating furnaces – Arc furnace device – Power supply system
Patent
1986-04-03
1987-05-05
Envall, Jr., Roy N.
Industrial electric heating furnaces
Arc furnace device
Power supply system
H05B 7148
Patent
active
046637648
ABSTRACT:
A method and apparatus for electrically balancing the phases of a three phase arc furnace, the furnace having a vessel containing a molten bath, three electrodes above the bath, and a transformer arrangement composed of three phases, each phase including a winding, the transformer arrangement being connected to the electrode so that each electrode conducts an arc current proportional to the voltage across the winding of a respective phase, by the steps of: matching the voltages between the electrodes and the bath to one another by adjusting the spacing between at least one electrode and the bath; and establishing symmetry among the arc currents by: varying the voltage across at least one phase winding by a selected increment; measuring the arc current amplitude in the electrode associated with the at least one phase winding after each variation step; and repeating the steps of varying and measuring until the differences between the arc current amplitudes of the three electrodes are less than a given value.
REFERENCES:
patent: 3431344 (1969-03-01), Borrebach
patent: 3493664 (1970-02-01), Kapell
patent: 3597518 (1971-08-01), Roberts
Bretthauer Karlheinz
Obenauf Hans-Dietrich
Envall Jr. Roy N.
Fried. Krupp Gesellschaft mit beschrankter Haftung
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