中文摘要：

提出一种电力变压器直流偏磁的电路一磁路模型。该模型根据电力变压器铁心和绕组的空间几何结构，建立了电力变压器的磁路结构，可有效反映电力变压器内部的磁通链耦合关系。为考虑铁磁材料中涡流效应的作用，提出铁心的频率相关非线性磁阻计算公式，并利用网络综合方法建立铁心磁阻的等效磁路模型。在一台三相电力变压器模型上进行了实验研究和仿真计算，实验结果和计算结果吻合，表明所提出的模型可有效地应用于电力变压器直流偏磁问题的研究。

英文摘要：

An electric circuit and magnetic circuit coupled model of the DC biased power transformer was presented. In the model, the magnetic circuit of power transformer was set up in accordance with spatial geometries of the core and that of the coil, representing effectively the magnetic flux linking in power transformer. To take account of the effects of eddy currents in ferromagnetic materials, a frequency-dependent formula for nonlinear reluctance of the transformer core was developed. Based on the formula of the reluctance the equivalent magnetic circuit was built up by virtue of network synthesis techniques. The experiment and computation were performed on a model of three-phase power transformer. The results of the computation coincide well with those of the experiment. It means that the model presented in the paper can be used in the research of the DC biased power transformer.