Abstract
The high frequency oscillation in voltage transformer is analyzed using an equivalent lumped circuit with FFT method. Such analysis has been regarded difficult since those used in high voltage distribution systems have a large number of turns. The constants of equivalent circuit are evaluated on turn-to-turn basis. The frequency domain analysis is followed by the time domain using FFT technique. The both characteristics are verified by the experiment on a 6.6kV voltage transformer. The nature of high frequency oscillation is shown for a simpler model. It is found the interlayer voltage is highest at the entrance of incoming surge.
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