Development of HV power transmission system requires continuous improvement of converter transformer’s performance

while additional loss as important basis of design

the available commercial software cannot provide relevant data; two-dimensional specialized program based on Magnet is designed for calculating transient electro magnetic field distributions and additional loss of UHV converter transformer. In order to improve acceptance of different design personnel

pre-processing of this proposed software is to provide not only function of adding mate rial attribute

but also examples of calculating transient electromagnetic field distributions of two-dimensional electromagnet

and mesh generation is used with combination of Delaunay and linear interpolation method. Main program is compiled by Visual Basic 6.0 and Magnet. Post-processing technique of the proposed software is to use VBscript

Txt and MATLAB for results display and analysis. To prove accuracy and validity of the proposed software

additional loss and short-circuit impedance of a 500 kV converter transformer model is calculated

from which the maximum error between calculated value and measured value is 4.1%.