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Presents the study on the dynamic buckling of the inner windings of large capacity transformers under shortcircuit conditions by a finite element method and the findings as follows: 1) No radial dynamic buckling of inner windings occurs under short-circuit conditions when the windings are well supported at all the radial supports; 2) The windings buckle under short-circuit conditions when the windings are not supported at one radial support (for instance, 25°) but well supported at all other radial supports; 3) When the windings are not well supported at one radial support, the ability of the windings to resist radial dynamic buckling can be greatly enhanced provided some measures are taken to provide necessary radial supporting.