基于非平均热源的油浸式变压器2维温度场分析

发布时间：2018-09-09 13:36

【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。
[Abstract]:In order to study the temperature field distribution of oil-immersed transformer more accurately and considering the influence of the nonuniformity of magnetic field loss distribution and temperature on the parameters of medium properties, a multi-physical field coupling calculation method based on non-average heat source is proposed. This method combines the advantages of the finite volume method and the finite element method. The finite volume method is used to analyze the flow field distribution of the transformer, the finite element method is used to study the temperature field distribution of the transformer, and the upwind scheme is added to the finite volume method and the finite element method respectively. The non-physical oscillation can be avoided effectively. By using the data mapping method, the magnetic field loss distribution is mapped to the computational grid of the temperature field, and the non-average heat source for the temperature field analysis is obtained. According to the simplified 2-D model of converter transformer, the maximum difference of velocity peak value is less than 0.03 m / s and the maximum temperature difference is less than 3 K by using the algorithm and the multi-physical field simulation software Comsol, respectively. The validity of the algorithm is verified. In addition, the distribution of temperature field under the condition of average heat source and non-average heat source is compared. The results show that the calculation result of non-average heat source is more consistent with the theoretical analysis than that of the average heat source method. It can provide reference for transformer life prediction and hot spot prediction.
【作者单位】：华北电力大学河北省输变电设备安全防御重点实验室;特变电工沈阳变压器集团有限公司;华北电力大学新能源电力系统国家重点实验室;
【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)~~
【分类号】：TM411

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