Analysis of lightning impulse voltage distribution for a dry-type transformer using three different winding types

Abstract

In this study, simulation and test results for lightning impulse voltage distribution in a dry-type transformer were compared for three different winding methods by using round, flat, and strip conductors. Distribution of the voltage inside the transformer windings at high frequencies had a different behavior than that of at low frequencies. The transformer had non-linear voltage distributions at high frequencies due to the inner capacitance and inductance of its windings. The ladder network model was used for the analysis of high frequency signals for voltage distribution. The parameters of the model were calculated analytically and numerically using a finite element analysis (FEA) software. The analytical solution method of a matrix obtained from the ladder network model was presented. Finally, simulation and test results were given and compared.