Abstract
This paper mainly focuses on the distribution of the standard lightning impulse (LI) voltage over transformer windings. In order to obtain the voltage waveform of different windings, the test platform contains an impulse voltage generator and a 35kV transformer model with multiple winding taps is built. Results of the distribution voltage are provided. The lightning impulse voltage distributes in a nonlinear way. The distort waveforms show the internal oscillations of the winding and resonant frequencies are in the range of several hundreds of kilohertz. The voltage difference between windings is larger in some specific windings, which gives some references for interturn insulation design.
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