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This study investigated the effect of magnetostriction-induced core magnetomechanical vibrations and noise on the magnetic properties of power transformers. The magnetostriction of grain-oriented Si steels was found to be extremely sensitive to compressive stress applied along the rolling direction and to tensile stress applied along the transverse direction. The compressive stress increased the variation in the magnitude of magnetostriction, which is correlated with core vibration and noise. A 2D model of the power transformer was used to simulate the noise and vibration variables through a finite element analysis. V

This paper analyzes the causes of magnetic reluctance in silicon steel wound cores with multi step-lapped joint structures through the appropriate exploitation of simulated and experimental local flux distributions in an air-gapped core, to propose techniques that can enable the reduction of the resulting core loss and vibration. The magnetic magnetostriction forces in the lap-joint regions, constituting another significant source of permeability, can be controlled by rearranging the step-lapped joint structure. Then, the computed local flux distributions were compared with experimental data. Single-phase pad-mounted distribution transformers with a capacity of 167 kVA were used in this study. It is indicated that the multi-step lap joint can significantly reduce the core loss and exciting power by regulating the configuration of adjacent air-gapped distances. Finally, composite-core structures were also used to validate the reduction of magnetostriction, core loss, and vibrations, corresponding to single-phase distribution transformer. V C 2014 AIP Publishing LLC. [http://dx.