大型油浸式变压器绕组温度场的有限元分析  

Finite Element Analysis for Temperature Field of Winding in Large Oil-immersed Transformer

作　　者：刘弘景 张丹丹[2] 李伟 徐绍军 黎立 周峰 杨博 LIU Hongjing;ZHANG Dandan;LI Wei;XU Shaojun;LI Li;ZHOU Feng;YANG Bo(State Grid Beijing Electric Power Research Institute,Beijing 100031,China;State Key Laboratory of Advanced Electromagnetic Engineering and Technology,Huazhong University of Science&Technology,Wuhan 430074,China)

机构地区：[1]国网北京市电力公司电力科学研究院,北京100031 [2]华中科技大学强电磁工程与新技术国家重点实验室,武汉430074

出　　处：《高压电器》2019年第12期83-89,共7页High Voltage Apparatus

摘　　要：大型油浸式电力变压器负载损耗较高,且绕组及油道结构复杂,为更好地掌握大型油浸式电力变压器绕组温度场分布特性,文中针对220 kV大型油浸式电力变压器,在分析变压器损耗与传热的基础上,建立了变压器流体力学-温度场耦合的仿真模型,基于有限元分析求得变压器内部温度-流体场,研究结果表明:由于绕组内部起导油作用的油道隔板的影响,温度沿绕组轴向高度呈周期性上升趋势;绕组局部温度分布不均衡,对绕组油道结构进行优化设计可改善绕组温度分布的局部不均衡性,降低绕组热点温度。The load losses of large oil-immersed power transformer is very high.In addition,the structure of the winding and oil channel is much complex.In order to grasp the temperature distribution of the winding in large oil-immersed power transformer,based on the analysis of the loss and heat transfer in transformer,a multi-physical field coupled simulation model for 220 kV large oil-immersed power transformer is established.Based on the finite element analysis,the temperature-fluid field in the transformer is obtained.The results show that the temperature rises periodically along the axial height of the winding due to the influence of the oil baffle on the inside of the winding,and the local temperature distribution of the winding is unbalanced.The optimization design of the winding oil channel structure can improve the local unbalance of the temperature distribution of the winding and reduce the hot temperature of the winding.

关 键 词：大型油浸式电力变压器 绕组损耗 温度场 油流速度 油道 

分 类 号：TM4[电气工程—电器]