树脂浇注式干式变压器内部温度场的三维仿真计算

Simulation of Three-Dimensional Temperature inside Field of Cast-Resin Dry-Type Transformers

本文对某一具体型号树脂浇注式干式变压器建立了三维传热模型,并基于多物理场耦合有限元仿真计算软件Comsol Multiphysics对干式变压器开展流固耦合温度场仿真计算,得出变压器温度场分布及热点的位置和温度,并与变压器内埋传感器实测温度对比,验证了仿真计算的准确性。除了热传导和热对流,本论文还考虑了热辐射和空气热学、力学及密度随温度的变化,以及上下夹件对干式变压器生热及散热对三维温度场的影响。本结论对干式变压器结构优化有指导作用。

In this paper, a three-dimensional axisymmetric heat transfer model for a specific type of resin cast dry transformer is established. And based on the Comsol Multiphysics simulation software, the three-dimensional fluid-solid coupling temperature field simulation was carried out for the dry-type transformer. Combined with the thermal properties of air-fluid, the temperature distribution in the temperature field and the hot-spot location and temperature have been determined. The result is compared with the measured temperature of the embedded sensor in the transformer so that we can see the simulation is right. Compared to tradition, in this paper, the effects of thermal radiation and air on three-dimensional temperature field with the changes of temperature, heat, mechanics and density are considered, also the effect of upper and lower clamps on heat generation and heat dissipation of dry transformers as well. It can guide the structural optimization and temperature monitoring of dry transformer and how to take measures to ensure safe operation.