Study of Magnetostriction Influence of Electrical Sheet Steel Under Different DC Biases

Power transformer iron core is mainly composed of electrical sheet steel, which is easily affected by vibration and noise. Therefore, it is necessary to measure the magnetostriction influence of electrical sheet steel. This paper analyzes the performance of vibration and noise in the power transformer iron core considering the magnetostriction influence of electrical steel sheet under different dc biases. First, the butterfly loops of magnetostrictive and magnetic hysteresis loops of electrical steel sheet measured by using a laser displacement magnetostriction measurement system, and the effect of dc bias on magnetostrictive and hysteresis characteristics was analyzed. Second, modeled to single-valued curves along the rolling direction and transversal direction for the finite-element method. Finally, the simulation results of a single-phase power transformer are verified by the experimental results under the dc bias.