Comparison of 3D and 2D field-circuit models of power transformer transients
This paper deals with a coupled field-circuit simulation of transients in a three-phase, three-limb power transformer taking non-linearity into consideration. A comparative analysis of the results obtained from the application of 3D and 2D field models has been carried out Owing to core saturation and the non-periodic components of the magnetic fluxes, the magnetic field exists also within the space surrounding the core. Hence, three-dimensional description is necessary. It has been proved that assuming the 2D model significantly overstated peak values of currents are obtained.
transformers magnetic fields power transistors field testing transient voltages