ABSTRACT
This chapter presents selected computer-assisted methods of analysis of short circuit withstand capability that take into account deformations, the structure of the windings, and the physical properties of the winding materials. Economic considerations as well as dimensional limitations of transformers make it necessary to apply stresses that are exerted also in the nonlinear parts of such materials. The coil deformation is a decisive factor for the transformer short circuit withstand capability. The existence of plastic deformations of inner coil conductors, under tensile short circuit forces, should be considered as a rule for large power transformers. Reduced stiffness of disk windings of core-type transformers for axial direction of short circuit forces, combined with the risk of the occurrence of resonance phenomena, warrants accurate methods to be applied for analyzing short circuit withstand capability. Experience indicates that too small static compressive force in relation to axial electrodynamic forces is one of the most frequent causes of transformer short circuit damages.
