Simulation of Underground Cable Temperature Distribution Based on Multiphysics Modeling

Because of buried underground cable, long service time and unreasonable load, it is easy to lead to insulation deterioration and accidents. Therefore, by accurately grasping the law of the influence of external factors on the temperature distribution of the cable, it is possible to rationally design the layout, backfill plan, and rationally distribute the load. This paper combines the knowledge of heat transfer and uses finite element software to study the temperature distribution of buried power cables. The finite element model built analyzes the spatial geometric parameters of underground cable laying, thermal backfill with different thermal conductivity, and different current load pairs. The influence of the temperature field of the underground cable can be seen more intuitively through the temperature cloud chart. The research results show that proper spatial geometric parameters and thermal backfill are not only beneficial to reduce conductor temperature, reduce safety hazards, and save a certain amount of cost, but are also of great significance to the full utilization of cable transmission capacity.