Numerical study on multi-operation of power cable in steel box girder

Understanding the temperature change in the steel box girder and power cable temperature change is of great significance to determine the load current of the power cable and prolong the service life of it. In this paper, the steady-state heat transfer model is used to study the temperature changes of the power cable itself and the surrounding steel box girder. In order to ensure the successful division of the mesh, the fine structure of the power cable is combined and the gap between the power cables is eliminated. The simulation results show that the rise of ambient temperature increases the overall temperature of power cable conductor and steel box girder, but the influence of load current on temperature is more significant, especially in the case of high current density. Through comprehensive consideration, appropriately reducing the maximum load current according to the environment will help to prolong the service life of the power cable.