基于有限元热-流耦合场仿真的变压器风道结构改进

Improvement of Transformer Air Duct with Thermal-fluid Coupled Field Simulation by FEM

变压器的热点温升是影响变压器正常运行的一个重要因素,合理的风道结构改进可以在一定程度上降低热点温升。为此,首先建立变压器的二维有限元模型,采用有限元磁场分析得出各部分的热源荷载;再通过有限元热-流耦合仿真计算,得到变压器绕组的温度分布,确定绕组的热点位置;然后针对热点分布位置提出了风道结构改进方案,并再次进行仿真分析。对比分析改造前后绕组的温度和热点情况,表明改造后热点温升降低15%,证明了改造方案的可行性。

Temperature rise of the transformer is an important factor for influncing the normal operation,and appropriate improvement of the air duct could decrease the temperature rise.Firstly,two-dimensional finite element model of transformer is established,and the magnetic analysis of FEM is carried out to obtain equivalent heat generation of the model.With thermal-fluid coupled field FEM simulation of the model,the temperature distributions and hot spots location in the windings are obtained.Then,the scheme of air duct improvement is proposed based on the analysis of the results,and the improved model is recalculated.In the end,temperature distribution and hots spots are compared under two air duct structures,and temperature rise of the hot spots has an decrease of 15%,which verifies the effectiveness of the improvement scheme.