METHOD AND SYSTEM FOR PREDICTIVE ELECTRODE LOWERING IN A FURNACE
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United States of America Patent
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Issued Date -
Mar 6, 2008
app pub date -
Apr 23, 2007
filing date -
Aug 30, 2006
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Abandoned
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Abstract
Aspects of the invention relate to methods and systems for predictive electrode lowering in an electric furnace. According to one aspect, there is provided a method comprising: monitoring an operating parameter of a variable reactance circuit; comparing the operating parameter with a threshold value; and lowering an electrode coupled to the variable reactance circuit if the operating parameter meets or passes the threshold value. The operating parameter may be a current threshold. The current threshold may be determined based on at least one of: a predetermined proportion of an expected total current through the variable reactance circuit; a primary supply voltage; a rated reactance value of the parallel inductor; and a target power factor. The current threshold may be in the range between about 10% and 60% of the expected total current through the variable reactance circuit and may vary proportionally with the primary supply voltage.
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