Apparatus and method for monitoring tap positions of load tap changer
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United States of America Patent
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Aug 26, 2008
Grant Date -
Mar 15, 2007
app pub date -
Sep 13, 2006
filing date -
Sep 14, 2005
priority date (Note) -
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Abstract
A load tap changer (LTC) having a plurality of windings is coupled to one of the primary and secondary windings of a power transformer in order to regulate the output voltage of the power transformer. The LTC includes a plurality of taps physically and electrically connected to the LTC windings and the transformer's output voltage is increased/decreased by moving along the taps a contacting element whose movement is controlled by a rotating shaft driven by a motor. The tap being contacted is determined by sensing the direction and number of shaft rotations and by checking the number of shaft rotations specified to go from a tap to the next tap being contacted. The time for a full rotation of the shaft is also measured. Also, the temperature of the tanks containing the LTC taps and the power transformer is measured for each tap position.
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