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Numerical and experimental evaluation of magnetostriction and magnetic forces on transformer stacks and joints for the assessment of core vibrations

This paper deals with the prediction of mechanical vibrations that exist on transformer cores due to magnetostriction and magnetic forces. Several single-phase transformer topologies are investigated, demonstrating the consequences of the configuration of the joints, with the aim to reveal the relative contributions of magnetostrictive and magnetic forces to the final vibration level. The results are obtained through advanced 3D electromagnetic and mechanical FE simulations, taking into account non-linear and anisotropic magnetic and mechanical material properties as well as parasitic airgaps. The results are compared with measurements to allow an assessment of the methodology. The research is based on a non-oriented, low-loss electrical steel from ArcelorMittal, that is typically used in small auxiliary transformers.