树脂浇注干式变压器温度场分布的计算分析  

Temperature Field Calculation and Analysis of Cast-resin Dry-type Transformers

作　　者：刘国坚[1] 王丰华[2] 

机构地区：[1]上海电力学院电气工程学院,上海200090 [2]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,上海200240

出　　处：《高压电器》2016年第8期83-89,共7页High Voltage Apparatus

基　　金：国家自然科学基金项目(51207090)~~

摘　　要：为更准确地掌握树脂浇注干式变压器的内部温度场分布,为变压器的绝缘寿命评估提供依据,在分析变压器产热散热机理及导热途径的基础上,依据干式变压器的实际对流传热和热辐射特性及温度场计算的流固耦合模型,在多物理场仿真软件COMSOL中实现了树脂浇注干式变压器温度场分布的建模计算,得到了干式变压器铁心和绕组的温度分布。同时将计算结果与干式变压器温升试验实测数据进行了对比,两者吻合较好,误差±5.5%,说明了计算结果的正确性。此外,计算结果表明:干式变压器绕组和铁心底部到顶部的温度分布呈现低—高—低走势,绕组热点位于低压绕组轴向约85%处,为变压器绝缘最薄弱点;绕组温度分布与负载大小关系有限,热点位置相对固定。To accurately understand the temperature distribution inside the cast-resin dry-type transformer for assessment of transformer insulation life, the temperature field in the dry-type transformer is calculated on the basis of heat transfer theory and fluid mechanics. First, a coupled thermal-hydraulic analytic model is built, and a physical model of the cast-resin dry-type transformer is established with the software COMSOL to calculate the temperature distribution of its components such as ferrite core and windings. Comparison between the simulation result and the measured one indicates that the physical model is accurate with an error of less than ±5.5%. According to the simulation,the temperature distribution of windings and core shows a low-high-low trend from the bottom up, and the hottest spot is located in low-voltage winding at 85% height from bottom. The correlation between winding temperature distribution and loading rate is limited, and hot spot maintains a relatively fixed position.

关 键 词：干式变压器 温度场 热点温度 绕组 负载率 

分 类 号：TM412[电气工程—电器]