基于T-T_0-Ω的三维有限元法及电力变压器计算

3D Finite Element Method Based on T-T_0-Ω and Computation of a Power Transformer

有限元法是一种求解电磁场的有效方法,T法具有求解变量少、计算代价小的优点,适于大型问题的求解。研究了基于矢量电位T的三维有限元法及源电流的T0表示方法,根据变压器绕组的特点,提出一种计算变压器绕组区T0的简单方法,并用于一台电力变压器漏磁场的计算。

Finite element method is an effective method of computing electromagnetic field. Because the T formulation has advantages of fewer unknown variables and less computing cost, it is suitable for solving large problems. In this paper, finite element method based on T formulation is studied. The method of expressing source current by T0 is also studied. By taking features of transformer windings, a simple method to compute T0 in transformer winding regions is given. The method is used in calculating leakage field of a power transformer.