GIL管廊温度分布的数值模拟研究

Numerical Simulation of the Temperature Distribution of the Pipe Gallery Employing the Gas-insulated Metal-enclosed Transmission Lines(GIL)

气体绝缘金属封闭输电线路(GIL)管廊的热环境对线路的安全运行及使用寿命具有直接的影响,有效排除线路的散热可保证管廊合理的温度分布。以青岛市某地下GIL管廊为研究对象进行模拟分析,利用FLUENT软件建立了GIL管廊的物理模型,设定机械进风、机械排风的通风模式,分析冬夏两季正常工况以及非正常工况下管廊内温度的分布规律。通过分析模拟结果得知:管廊受进风温度的影响较大,送风温度越高使得管廊整体温度越高;夏季非正常工况下,出现电缆周围的局部温度过高,不能满足规范“不能高于40℃”的要求,应及时检修维护,尽量避免这种工况发生。研究结果可为GIL管廊通风系统的应用提供理论依据和技术指导。

The thermal environment of the pipe gallery employing the Gas-insulated Metal-enclosed Transmission Lines(GIL)features for a direct influence on the safe operation and service life of the line,so effectively eliminating the heat dissipation of the line can ensure the reasonable temperature distribution in the pipe gallery.The paper takes an underground GIL pipe gallery in Qingdao as the research object and then the corresponding simulation analysis is conducted.The FLUENT software is employed to establish the physical model of GIL pipe gallery,and the ventilation mode adopting of mechanical air intake and mechanical exhaust air is set.Accordingly,the rules of indoor temperature distribution can be investigated for both normal and abnormal working conditions in winter or summer.The simulation results show that the inlet air temperature has a great influence on the temperature distribution of pipe gallery,the indoor overall temperature of the pipe gallery increases with the air supply temperature;in addition,the surrounding local temperature of GIL is too high under abnormal conditions in summer,and cannot meet the specification requirements because the temperature cannot be higher than 40℃.Therefore,the timely maintenance should be conducted to avoid the occurrence of such conditions as far as possible.The research results can provide theoretical basis and technical guidance for the application of ventilation of GIL pipe gallery.