基于参数热等效的10 kV变压器温度流体场三维仿真计算

变压器温度流体场三维仿真是准确计算变压器绕组热点温度的重要方法,然而变压器绕组结构复杂,精确考虑绕组导线和绝缘结构的三维模型建模和网格剖分困难,同时计算效率低,难以满足实际工程需求.提出了一种配电变压器绕组结构的热等效简化分析方法,采用热导率各向异性、比热容等效的块状导体来等效实际的绕组结构.应用所提方法对一台S13-...

Three dimensional thermal fluid field simulation of 10 kV transformer based on parameter thermal equivalence

The three-dimensional simulation of transformer temperature fluid field is an important method to accurately calculate the winding hot spot temperature. As the winding structure is complex, the winding modeling and mesh generation considering the detailed conductor and insulation are difficult, and the calculation efficiency is low, which is difficult to meet the actual engineering needs. A simplification method based on parameter thermal equivalence for the winding structure of 10 kV distribution transformer is proposed. The block conductor with anisotropic thermal conductivity and equivalent specific heat capacity are used to replace the actual winding structure, and the method is applied to calculate the three dimensional thermal fluid field of a S13-M-200 kV·A/10 kV oil immersed transformer. In order to verify the simulation model, the transformer temperature rise test based on the short circuit method is carried out. The results show that thermal equivalent parameter method can greatly reduce the mesh number of transformer, and the temperature calculate results can effectively reflect the axial winding temperature distribution, the maximum error between simulation and test result is less than 4 %,which proves the validity and accuracy of the proposed method.