油浸式变压器二维电磁-流体-温度场耦合分析方法研究

2-D Coupled Electromagnetic-fluid-thermal Analysis of Oil-immersed Transformer

介绍了一种基于有限元法的变压器二维电磁-流体-温度场耦合分析方法。通过建立变压器二维模型,采用有限元法求解变压器内磁通密度分布;并计算变压器铁心及绕组损耗。随后,采用多物理场间接耦合方法将损耗作为热源加载条件求解变压器流体-温度场,分析变压器内部油流速度及温度分布。对35 kV油浸式变压器进行二维电磁-流体-温度场分析,将温度仿真结果与经验公式的热点温度计算结果进行对比,验证了方法的有效性和正确性。

A 2-D coupled electromagnetic-fluid-thermal analysis method of transformer based on finite element method is proposed.Based on 2-D transformer model,the magnetic flux density distribution inside the transformer model is analyzed by finite element method,the core and winding losses are calculated.By weak coupling method,the transformer losses are taken as heat sources in fluid-thermal analysis,the velocity of oil flow and temperature distributions inside the transformer are analyzed.The method is applied to the 3-D electromagnetic-fluid-thermal analysis of 35 kV oil-immersed transformer,and the temperature results are compared with the calculation results obtained by empirical formula to verify the correctness and effectiveness of the proposed method.