Industrial electric heating furnaces – Arc furnace device – Power supply system
Reexamination Certificate
2007-05-01
2007-05-01
Van, Quang (Department: 3742)
Industrial electric heating furnaces
Arc furnace device
Power supply system
C373S105000, C373S108000
Reexamination Certificate
active
11214978
ABSTRACT:
A method and system for stabilizing energy consumption in multiple loads, or in single multi-phase loads. The method and system also compensates for unbalance in multi-phase loads. A central controller monitors variable reactances in the loads and identifies situations of power and/or current fluctuation and/or unbalance. It determines appropriate corrective action by the other loads/phases to compensate for the power and/or current change or unbalance due to the problematic load, and it issues control signals instructing variable reactor controllers associated with the other loads to adjust accordingly. The method and system may by applied to electric arc furnace installations. In this context, the method and system provide an electrode position controller coupled to the feed rate controller so as to predictively anticipate the introduction of new source material and lower the electrodes so as to prevent arc extinguishment while the variable reactors maintain predetermined power set-points. The electrode position controller may be used in place of the variable reactance control system to take corrective action to address power and/or current changes or unbalances. The system and method may be employed to maintain a predetermined level of unbalance in the system.
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Lai Wai Ma Thomas
Sedighy Mohammad
Bereskin & Parr
Browne Sylvan S.
Hatch Ltd.
Van Quang
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