Based on finite element method （FEM）

the vibration of power transformer windings caused by electrodynamic force is analyzed. The magnetic electric coupling model with different parameters corresponds to the different operation modes -- no load

full load and short circuit. The computation results illustrate that there exists press force in radial direction of inner winding

and extension force in radial direction of outer winding. There is little electrodynamic force in axis direction of both inner and outer windings. Moreover

there exists pushing force between adjacent pies or turn of windings. Especially

the enormous short circuit electrodynamic force will make the windings distorted

damaging part or whole winding

resulting in the fault of transformer.