基于有限元分析的箱式变电站的散热设计

Heat dissipation design of prefabricated substation based on finite element analysis

通过对目前已通车的高速公路箱式变电站的走访维护,发现大部分变电站的箱体都由厚钢板制作而成,而且这个箱体基本露天安装,备受日晒雨淋,在夏天的时候,里面温度普遍比室外高,当室外温度为30℃时,箱体内可达40~50℃,遇到高温天时甚至可达60℃。为了改善这些问题,通过对变电站箱体的微小结构优化,在箱体门增设具有满足防尘等级要求的“小窗户”。相对之前成本增加较小,增加了箱体内的通风条件,然后通过Flow Simulation热仿真对其优化后的变电站室内进行相同环境下的仿真,仿真结果显示,改进后的高速公路机电箱式变电站室内温度基本接近于仿真时设置的室外温度。

The cabinet of the prefabricated substation is usually made of thick steel plates,which is basically installed outdoors and heavily exposed to sunshine and rain.In summer,the temperature inside the cabinet is generally higher than that outside.When the outside temperature is 30℃,the temperature inside the cabinet can reach 40℃to 50℃,even 60℃when encountering extremely high temperature days.In order to solve the problem,the structure of the cabinet is optimized,and a small window that can meet the dust prevention requirements is added to the cabinet door.Compared with the previous cabinet,the cost increase is small,and the ventilation condition inside the cabinet is improved.The optimized substation is simulated under the same environment conditions by using Flow Simulation,and the results show that the optimized prefabricated substation outperforms the common prefabricated substation in terms of heat dissipation.