Study On Quantitative Method Of Partial Discharge In Transformer Winding Based On The Model Of Multi-Conductor Transmission Line

Based on multi-conductor transmission line (MTL) theory, a new model of partial discharge pulse propagating in single phase transformer is established. The finite element method is used to calculate the elementary parameters of transformer winding. A nine-conductor simulation model of transformer winding was designed, and a methodology for measuring distributed parameters of the model is presented. The voltage transfer functions are calculated by the measurement parameters, which compared with the experimental data of impulse response method. The results indicate that the calculated results are consistent with the experimental data. Thus the methodology presented and the MTL model established in this paper are demonstrated to be effective. The effects of different PD locations on the apparent discharge are researched by the MTL model. The geometrical mean of results from two winding terminals is used to correct the apparent discharge, thus the effect of the PD locations on the apparent discharge will be decreased effectively.