Computation and Experimental Test of Magnetostrictive Deformation in a Single-Phase Transformer Core Model Taking the External Stress into Account

With the rapid development of the power grid system, the impact of noise generated by vibration on the lifespan of power equipment and the health of surrounding residents is becoming prominent. One of the main sources of vibration and noise of power equipment is the magnetostrictive effect of electrical steel materials and the electromagnetic interaction among core laminations. This article mainly investigated the core deformation and stress sensitivity caused by magnetostriction in a single-phase double column transformer. Firstly, the magnetic field and structural force field of a single-phase double column transformer core were simulated, and the core deformation caused by magnetostrictive effect of electrical steel sheet was analyzed. Secondly, the single-phase transformer core model was setup experimentally, its local vibration deformation was measured, and the simulated results were verified compared with the measured ones. Finally, the variation law of core vibration acceleration under the influence of mechanical stress was measured and analyzed.