Dielectric Characteristics of Oil filled Transformer under Non-standard Lightning Surge Waveforms : Dielectric Characteristics of Turn-to-Turn insulation Model under Non-standard Lightning Surge Waveforms combined with Oscillatory Voltage

To achieve a rational insulation design for transformers, it is important to evaluate dielectric strength against actually impinging on equipment on-site This paper deals with the dielectric characteristics of a turn-to-turn insulation model for oil filled transformer under non-standard lightning surge waveforms combined with oscillatory voltage. As the results‚ the breakdown voltages and the partial discharge inception voltages of a turn-to-turn insulation model under non-standard impulse wave forms are higher than standard impulse voltages.