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.