铁心材料饱和磁化强度的偏差对求解变压器涌流的影响（英文）  

Influence of the Error of Saturation Magnetization of Core Material on the Solution of Transformer Inrush Current

作　　者：王迎迎 袁建生[2] Wang Yingying;Yuan Jiansheng(School of Mechanical Electronic and Information Engineering China University of Mining and Technology (Beijing) Beijing 100083 China;Department of Electrical Engineering Tsinghua University Beijing 100084 China)

机构地区：[1]中国矿业大学(北京)机电与信息工程学院,北京100083 [2]清华大学电机与应用电子技术系,北京100084

出　　处：《电工技术学报》2019年第12期2452-2459,共8页Transactions of China Electrotechnical Society

摘　　要：铁磁材料在深度饱和时的磁化曲线是准确计算涌流的前提,而测量的磁化曲线一般不能满足涌流计算的需求。这是因为制作测量深度饱和磁化曲线的装置是很难完成的,而且目前也没有相关的标准。因此,通常基于已测量的数据和磁化原理用方程来大致拟合深度饱和时的磁化曲线。在本文中,磁化曲线通过二次和三次函数(Akima插值法)延拓,并且利用三次函数延拓的曲线更接近可用的测量结果。饱和磁化强度Ms是形成深度饱和磁化曲线的关键参数。本文讨论了Ms对磁化曲线的影响,用非线性暂态的有限元方法分析了Ms对求解变压器涌流的影响。当Ms减小时,磁化曲线下降,动态磁导率下降,因此电流将在一定电压下增加。当电压约为额定电压的1.38倍时,由Ms引起的电流误差最大。研究表明,Ms的5%的偏差会导致涌流计算结果产生66%的偏差。尽管通过测量获得硅钢片的高精度Ms不是一件容易的事情,但应该设法降低其误差,以使得仿真变压器过电压工况时有较高的精度。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.

关 键 词：饱和磁化强度 电力变压器 铁磁材料 涌流 

分 类 号：TM301.4[电气工程—电机]