When a sudden short circuit fault occurs on three phases of a power transformer

the short circuit current produces a significant influence on dynamic stability of the transformer windings. In this paper

the mechanical strength and transient dynamic response of the low-voltage winding under the electromagnetic force due to short circuit are analyzed for a 220 kV power transformer based on magnetic-mechanical coupling analysis via two-dimensional finite element method. The axial and radial components of electromagnetic force on the lowvoltage winding are calculated by using electromagnetic analysis. Kinetic analysis is conducted to calculate the radial stress and strain in the disk which undergoes the maximum radial electromagnetic force. The axial transient dynamic stress and displacement of the low-voltage winding are investigated considering the elastic modulus of the kraft paper. This study may facilitate the strength verification of transformer winding in short circuit condition.