Propagation Characteristics Analysis of Partial Discharge Between Windings of Converter Transformer

During the factory test of the converter transformer, the partial discharge withstand voltage test is usually used to judge whether the internal insulation structure is intact. In this study, a simulation model of the converter transformer based on distributed parameters is established. The basis for the establishment of the model is that the windings of the converter transformer have distributed parameter characteristics, and different partial discharge locations are considered. And by changing the position of the partial discharge signal applied to different positions of the winding, the signal waveforms at different points at the monitoring impedance are obtained. Through the analysis of the partial discharge signal transmission relationship in the partial discharge test of the valve side winding of the converter transformer, combined with the distribution parameter based partial discharge signal transmission model of the converter transformer winding, finally through the time domain waveform and frequency spectral density analysis and demonstration of the converter Propagation characteristics of partial discharges between transformer windings. At the end of this paper, a summary and outlook are also made, which provides a theoretical basis for the follow-up research.