Box-in结构对特高压换流变压器散热性能影响的仿真分析

Box-in结构在减弱换流变压器噪声影响方面发挥了较好的作用,但其对换流变压器散热和温度分布的影响值得关注.采用有限元仿真方法对有无Box-in结构换流变压器周围的环境气流分布和变压器自身油流和温度分布进行数值模拟,分析了Box-in结构的存在对换流变压器温升的影响规律,研究了Box-in结构换流变压器的通风策略.结果...

Simulation Analysis of Box-in Structure Influence on Heat Dissipation Performance of UHV Converter Transformer

Box-in structure plays an important role in reducing the noise effect of the converter transformer,but its influence on heat dissipation of the converter transformer deserves attention.In this paper,the finite element simulation method is used to study the air flow distribution around the converter transformer,the oil flow and the temperature distribution of the transformer itself with or without Box-in structure.The influence of the Box-in structure on the temperature rise of the converter transformer is analyzed,and the ventilation strategy is studied.The results show that the temperature rise of the tank walls of the converter transformer decreases with the increase of the ambient wind speed;that the convective heat transfer capacity of the tank walls of the converter transformer is greatly reduced due to the existence of the Box-in structure,which results in the average temperature of the tank walls of the transformer with Box-in structure being 3.5 K higher and the local temperature 7.7 K-17.55 K higher;and that in the case of forced ventilation,the temperature rise of the converter transformer tank walls will decrease exponentially with the increase of wind speed.Considering the ambient temperature and the air flow situation of the converter transformer,three ventilation strategies,namely direct natural ventilation,parallel natural and forced ventilation and direct forced ventilation,can be adopted.