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.