基于绕组热分布的改进油浸式变压器绕组热点温度计算模型

发布时间：2019-06-15 14:58

【摘要】：为准确计算变压器的绕组热点温度,给变压器的过载能力及绝缘寿命评估提供依据,在分析变压器绕组热分布热性及导热途径的基础上,提出了一种改进的基于底层油温的变压器热点温度等效计算模型。该模型通过明确定义热点温度的等效热源并考虑变压器油粘度及铜损的温度特性,得到了变压器热点温度等效计算模型的解。通过搭建变压器温升试验平台,采用光纤测温系统对变压器绕组的热点温度进行了测试分析。将实测数据与热路模型的计算结果及其它现有热路模型计算得到的温度曲线的对比分析结果表明,依据所提出的改进热点温度模型计算得到的变压器绕组热点温度曲线所对应的误差系数明显小于其它方法的计算结果,至少减小了40%,具有更高的预测精度。
[Abstract]:In order to accurately calculate the winding hot spot temperature of transformer and provide the basis for evaluating the overload capacity and insulation life of transformer, an improved equivalent calculation model of transformer hot spot temperature based on bottom oil temperature is proposed on the basis of analyzing the heat distribution and heat conduction path of transformer winding. By clearly defining the equivalent heat source of hot spot temperature and considering the viscosity of transformer oil and the temperature characteristics of copper loss, the solution of the equivalent calculation model of transformer hot spot temperature is obtained. By building the temperature rise test platform of transformer, the hot spot temperature of transformer winding is measured and analyzed by using optical fiber temperature measurement system. The comparison and analysis of the measured data with the calculation results of the thermal circuit model and the temperature curves calculated by other existing thermal circuit models show that the error coefficient corresponding to the hot spot temperature curve of transformer windings calculated by the proposed improved hot spot temperature model is obviously smaller than that of other methods, and the error coefficient is reduced by at least 40%, and the prediction accuracy is higher.
【作者单位】：上海交通大学电力传输与功率变换控制教育部重点实验室;国网天津市电力公司电力科学研究院;
【基金】：国家自然科学基金(51207090)~~
【分类号】：TM411

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