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 established

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 canimproves 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.