地下电力电缆群敷设水冷管道模型的研究

Research on Water-cooled Pipe Model of Underground Power Cable Groups

随着城市用电负荷需求的日益增大,采取适当的措施提高电缆群的载流能力有重要研究意义。文中主要研究了在电缆群中敷设水冷管道这种增容方式,即水冷管道中对流换热带走电缆群产生的热量,使得电缆群区域降温,从而提高电缆群载流量。首先建立电缆群敷设水冷管道模型,然后对水流体的流动因素进行有限元分析,并计算载流量,从而验证这种方法对提升电缆载流量的效果。通过Ansys仿真计算的结果数据可知,对于水冷管道模型,水流温度及流速是影响电缆群载流量提升效果的主因,其改善电缆群的散热效果。电缆群载流量的提高可达28%。

With the increasing of power load in the city, it is important to take appropriate measures to improve the carrying capacity of cable group. In this paper, we mainly explore this method of cable water-cooled pipe laying for capacity increasing. For water-cooled model, the heat generated by power cable groups is taken away by the convective heat transfer in water-cooled pipe, so that the environment temperature of cable groups decreases, therefore, it is a feasible and effective method to exploring cable transmission capacity of cable group. The theoretical models of underground power cable groups with water-cooled pipe is estabhshed, then the flow factors of aqueous fluid in water- cooled pipe analyzed by using FEM, and ampacity for cable groups are calculated, thus the accuracy of the models is verified through experiments and the comparison with previous research results. These result of calculation on cable groups ampacity by Ansys indicate that water temperature and velocity have a great impact on cooling effect, and it can improves the heat dissipation effect of the cable groups, thus the total ampacity of cable groups is significantly improved to almost 28% for aqueous fluid in water-cooled pipe.