Research on Influence of Buried Sand on Cable Temperature Rise Characteristics in Tunnel

In order to study the influence of buried sand conditions on the temperature rise characteristics of cables in the tunnel, a two-dimensional cable model was established in the finite element software COMSOL for simulation. Compare and analyze the temperature difference of cable core between buried sand cable and not-buried sand cable, and investigate the influence of air convection heat transfer coefficient and cable spacing on cable current carrying capacity. The results show that with the increase of the load, the temperature difference between the core of buried sand cable and the core of the not-buried sand cable also gradually increases. Although buried sand conditions will increase the temperature of the cable, the temperature difference under the load of the actual application is small, and the impact of buried sand on the current carrying capacity of the cable is also weak. Burying sand also has a strong fireproof effect, so it is necessary study the influence of buried sand conditions on the temperature rise characteristics of cables.