Apparatus and method for cooling power transformers
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United States of America Patent
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Sep 25, 2012
Grant Date -
Dec 16, 2010
app pub date -
Jun 7, 2010
filing date -
Jun 15, 2009
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Abstract
The cooling system for a power transformer is activated by sensing and processing the frequency characteristic including the harmonic contents, of the inrush current into the transformer, when the transformer is first energized. The cooling system may include motors operating devices such as oil circulating pumps and fans causing a coolant to flow about the power transformer. The cooling system is deactivated by sensing when the transformer is de-energized and when its temperature is below a predetermined level.
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