中文摘要：

为便于诊断干式变压器的故障，对干式变压器进行热点分析。根据干式变压器实际结构建立了三维对称热传导模型，并基于多物理场有限元软件平台Comsol Multiphysics对干式变压器开展温度场仿真计算，计算得出温度场分布云图以及铁芯、绕组温升曲线。通过比对实际数据和仿真分析结果，从而确定温度分布及最热点温度位置在低压绕组距底部2/3处，可为该类干式变压器的在线诊断及结构优化设计提供理论依据。

英文摘要：

To conveniently diagnose the faults of dry-type transformer mostly due to abnormal temperature rise directly or indirectly, and the simulation of the hot-spot temperature has important theoretical and engineering application value. According to the actual structure of dry-type transformer, a three-dimensional axisymmetric heat conduction model is established, and the simulation of temperature field calculation of dry-type transformer is carried out based on Comsol Multiphysics to calculate the temperature field distribution and iron core, windings temperature rise curve. Through the comparison between the actual data and the results of the simulation analysis, the temperature distribution and the hottest spot temperature at position 2/3 from the bottom in the low voltage winding is determined. It provides a theoretical reference for dry-type transformer diagnosis and structural optimization of online design.