聚合物水泥混凝土输电管道的力学仿真

文中基于有限元仿真软件Ansys,对聚合物水泥混凝土输电管道在实际运行中的力学问题进行了仿真研究,仿真所需参数以生产厂家的实际产品为准。首先计算了输电管道在正常工作时的温度分布与热应力分布,然后进一步研究了输电管道结构和绝缘材料特性对温度和热应力的影响。结果表明:增大导体横截面积可以有效降低温度和热应力;在保证绝缘材料电阻率足够高的前提下,增大材料的热导率也有显著效果;此外,减小材料的弹性模量也可以有效降低热应力,其他参数的影响则较为复杂。最后分别计算了三相输电管道在稳态和短路时的电动力。短路电动力大约为稳态时的200~400倍,严重威胁输电管道的安全稳定运行。文中对输电管道的结构设计和绝缘材料选用具有重要指导意义。

Mechanical Simulation of Polymer Cement Concrete Insulated Power Transmission Pipeline

The finite element simulation software Ansys is employed to simulate and analyze the mechanical problems of polymer cement concrete insulated power transmission pipeline in service.The parameters in the simulation are coincident with a real product.The temperature and thermal stress distributions of the pipeline in normal condition are calculated firstly.Then the effects of the pipeline structure and the performance of the insulating material on the temperature and thermal stress are analyzed.The results show that the temperature and thermal stress can be reduced effectively by increasing the cross-section area of conductor.On the premise of ensuring large enough resistivity of the insulating material,the temperature and thermal stress can also be obviously reduced with the increase in the thermal conductivity.Besides,thermal stress can be reduced by decreasing the elastic modulus of material.However,the effects of other parameters are complex.In addition,the electromagnetic forces of a three-phase power transmission pipeline in both steady and short-circuit conditions are calculated,and the result indicates that the short-circuit force is approximately 200~400 times of the steady force,which seriously threatens the safety and stability of the pipeline.This study may facilitate structure design and insulating material selection of power transmission pipeline.