Influence of the Error of Saturation Magnetization of Core Material on the Solution of Transformer Inrush Current
Wang Yingying1, Yuan Jiansheng2
1. School of Mechanical Electronic and Information EngineeringChina University of Mining and Technology (Beijing) Beijing 100083 China; 2. Department of Electrical Engineering Tsinghua University Beijing 100084 China
Abstract：The measured magnetizing curve usually fails to meet the requirements of inrush current simulation. Since there are no standards for measuring magnetizing curve by measurement devices, it is usually expressed approximately by a function. In this paper, the magnetizing curves are extended by quadratic and cubic functions (Akima interpolation method), where the cubic function is closer to the available measurement results. Saturation magnetization Ms is a key quantity in forming magnetizing curve in deep saturation. The influences of Ms on the magnetizing curve and the solution of transformer current were analyzed by the nonlinear transient finite element method. When Ms decreases, the magnetizing curve as well as the dynamic permeability goes down, the current hence increases under a certain voltage. When the voltage is about 1.38 times the rated voltage, the errors of the current caused by Ms are maximum. The results show that an error of 5% of Ms can cause an error of 66% of the current solution. Although it is not easy to get high accurate Ms for silicon steel sheet by measurement, its error should be managed to reduce to obtain the relatively high accuracy of the over-voltage operation simulation.
王迎迎, 袁建生. 铁心材料饱和磁化强度的偏差对求解变压器涌流的影响[J]. 电工技术学报, 2019, 34(12): 2452-2459.
Wang Yingying, Yuan Jiansheng. Influence of the Error of Saturation Magnetization of Core Material on the Solution of Transformer Inrush Current. Transactions of China Electrotechnical Society, 2019, 34(12): 2452-2459.
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2019, Vol. 34 
