电力变压器铁芯磁场和损耗分布的三维数值方法与实施(第二部分:三相五柱变压器)

3D Computation of Flux and Loss Distributions in Power Transformer Cores(Part Ⅱ: three-phase five-limb transformers)

本文先简要说明了用标量磁位分析三相五柱变压器铁芯磁场的局限性,然后建立了这种特殊结构的三维矢量磁位分析模型及其有限元分析格式,并较好地解决了传统矢量位分析模型中的未知等位面问题。

Following part I, the scalar potential model for computational modelling of magnetic field in five-limb cores is described in this part at first and some disadvantages of that model are discussed. Accordingly, a modified universal three dimensional finite element magnetic vector potential formulation is developed and the emphases are placed on that how to determine the boundary conditions on all unknown isopotential surfaces for various constructions. Some typical five-limb cores, such as, salient yoke, split limb and so on, are investigated numerically and the computed results of flux and loss distributions are given.