The simulation results for this sample transformer show that the inrush current axial force is larger than clamping force (which is equal to the net downward axial force that is exerted on the windings during the steady state short-circuit condition) even 2.4 s after energizing the transformer. A compact three-phase, core-type 132/20 KV, 30 MVA, power transformer is modeled, employing two-dimensional (2D) FEM, the different forces under short-circuit and inrush current conditions are evaluated as a function of time. The simulation results obtained by this method are compared with the measured values. A simplified analytic method is presented for computation of inrush current in transformer. Time-variant axial and radial electromagnetic for ces under inrush current and short-circuit current are calculated (by finite element method FEM) and compared.
