基于非平均热源的油浸式变压器2维温度场分析  

Two-dimensional Temperature Field Analysis of Oil-immersed Transformer Based on Non-uniformly Heat Source

作　　者：刘刚[1] 靳艳娇 马永强[1] 王连鹏[2] 池骋[1] 李琳[3] 

机构地区：[1]华北电力大学河北省输变电设备安全防御重点实验室,保定071003 [2]特变电工沈阳变压器集团有限公司,沈阳110144 [3]华北电力大学新能源电力系统国家重点实验室,北京102206

出　　处：《高电压技术》2017年第10期3361-3370,共10页High Voltage Engineering

基　　金：国家自然科学基金(51407075);河北省自然科学基金(E2015502004);中央高校基本科研业务费专项资金(2015MS79)~~

摘　　要：为了更准确地研究油浸式变压器温度场分布,考虑磁场损耗分布不均匀性和温度对媒质物性参数的影响,提出一种基于非平均热源的多物理场耦合计算方法。该方法结合了有限体积法和有限元法的优点,采用有限体积法分析变压器流场分布,采用有限元法研究变压器温度场分布,并在有限体积法和有限元法中分别加入迎风格式,可有效避免计算过程中产生的非物理振荡。通过数据映射方法,将磁场损耗分布映射到温度场的计算网格中,得到温度场分析的非平均热源。针对换流变压器2维简化模型,分别用该算法和多物理场仿真软件Comsol计算了流体场和温度场,2种方法得到的速度峰值最高差≤0.03 m/s,最高温度相差≤3 K,验证了该算法的有效性。此外,还对比分析了平均热源和非平均热源条件下的温度场分布,分析结果表明,与平均热源方法相比,非平均热源的计算结果与理论分析更相符,可为变压器的寿命预估与热点预测提供参考。In order to analyze the influences of the temperature and the inhomogeneity of magnetic field loss on the physical parameters of the material,a multi-physical field calculation method based on the non-uniform heat source is presented for more accurately obtaining the temperature distribution in the power transformer.This method adopts the advantages of finite volume and finite element method.The fluid field distribution is calculated using the upwind finite volume method so as to study the temperature field distribution of the transformer.Non-physical oscillations are effectively avoided by introducing an upwind difference in the solution.Through the data mapping method,the magnetic field loss distribution is mapped into the calculation grid of the temperature field,and then the non-uniform heat source of the temperature field is obtained.The proposed method is applied to calculate the temperature distribution and fluid field,and the results of the proposed method are compared with those of software Comsol for two-dimensional simplified model of converter transformer.The difference of the velocity peak obtained in the two methods is less than 0.03 m/s,and the maximum temperature difference does not exceed 3 K,which proves the accuracy and validity of the proposed method.At the same time,the difference of the temperature field distribution is compared and analyzed under uniform heat source and non-uniform heat source.The results show that the calculated results obtained by non-uniform heat source are more accurate than the uniform heat source compared with theoretical analysis,which can be provided as references for the life expectancy and the hot spot prediction of the transformer.

关 键 词：油浸式变压器 迎风有限元法 迎风有限体积法 非平均热源 流体场 温度场 

分 类 号：TM411[电气工程—电器]