Research on radial stability of large transformers windings under multiple short-circuit conditions

The radial instability of conductors of windings in large transformers becomes serious under multiple short-circuit conditions. This paper presents a nonlinear buckling analysis method to compute and analyze the deformation of windings for a short-circuit test model transformer. The initial defect, which is computed based on multi-span elastic-support model, is used as the initial condition of magnetic-mechanical coupling analysis using finite-element method. To validate the feasibility and applicability of the proposed method, the numerical results obtained from the proposed method are compared with those of experimental ones.