Influence of Supporting Failure on Magneticstructural Displacement for Power Transformer Windings under Short Circuit Fault

When the power transformer vibrates during operation and withstands short-circuit electromagnetic force many times, the insulation support structure of the transformer winding will appear asymmetric phenomenon. At this time, the winding is again affected by short-circuit electromagnetic force, transformer winding will occur more serious displacement, bulge and collapse. In this paper, a three-dimensional magneticstructure coupling model is established, and the magnetic flux density and electromagnetic force density of power transformer windings under short-circuit current are calculated by finite element method (FEM). Taking the short- circuit current as the independent variable and the winding displacement as the dependent variable, the electromagnetic field and structural field are simulated and analyzed by Ansys Workbench software to obtain the winding displacement results.