Calculation of Distributed Parameters of Transformer Winding Based on the Model of Multi-conductor Transmission Line

In order to investigate the propagation process of partial discharge pulses in transformer winding,a simulation model of 40-turn single-layer winding based on multi-conductor transmission line theory is established.The core material of the winding is regarded as hollow,iron and aluminum respectively.According to the symmetry of a winding,a 2D equivalent finite element model is set up in ANSYS environment.In the process of calculation,the skin effect is taken into consideration.The frequency-dependent parameters are calculated at different frequency points in time-harmonic magnetic field based on FEM.The simulation results basically tally with the measurement values.The proposed methods of calculating parameters are helpful to research on propagation characteristics of partial discharge(PD) pulses in electric equipments.