基于有限元法的变压器漏感计算在绕组变形中的应用

Leakage inductance calculation based on finite element method for power transformer and its application to winding deformation analysis

电力变压器电磁分析与参数计算在科学研究与工程应用中一直受到普遍的重视,而绕组变形作为故障隐患的重要特征,其变形程度尚无法量化。以有限元方法为研究基础,利用大型有限元软件ANSYS建立变压器铁芯、绕组模型;以场路耦合方法实现变压器漏磁场的仿真,同时利用能量法原理完成变压器漏感参数的计算。针对电力变压器发生绕组变形将会导致漏感参数发生变化的基本特征,提出通过改变绕组的基本几何尺寸模拟绕组变形,计算变形前后以及各种变形形式下的漏感参数值,考察绕组变形状态和漏感参数变化量之间的关系。仿真计算结果与测量值比较,表明方法的正确性、有效性和实用性。

The electromagnetic analysis and parameter calculation of power transformer are emphasized in scientific research and engineering application,while the winding deformation,which is the important cause of fault,is difficult to represent quantitatively. Based on finite element method,the ferrite core model and winding model are established using the finite element software ANSYS. The electromagnetic characteristic is analyzed using the magnetic-electric coupling method and the lea-kage inductance parameters of power transformer are calculated using energy method. As winding deformation causes leakage inductance change,the leakage inductances before and after different winding deformations are calculated by changing the physical dimensions of winding and the relation between winding deformation and leakage inductance change is studied. Comparisons between ANSYS simulative results and measurements show its correctness,effectiveness and practicability.