Electricity: power supply or regulation systems – Output level responsive – Using a transformer or inductor as the final control device
Reexamination Certificate
2006-09-13
2008-08-26
Ro, Bentsu (Department: 2837)
Electricity: power supply or regulation systems
Output level responsive
Using a transformer or inductor as the final control device
C318S603000
Reexamination Certificate
active
07417411
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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Hoffman Gary R.
Tennille Thomas C.
Advanced Power Technologies, LLC
Ro Bentsu
Schanzer Henry I.
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