Current carrying capacity analysis of 10 kV cable joint under extremely high temperature

With the increase in ambient temperature around the world in summer, the working environment of cable joints is deteriorating. Based on the finite element method, a simulation model for temperature analysis in a 10 kV three-core cable and the joints is established. The temperature distribution is analyzed under different ambient temperatures and different currents. Firstly, the temperature rise experiments are carried out to obtain a steady temperature on the surface of the cable joint, which verifies the accuracy of the simulation model. Then, the relationships between the surface temperature and the current of the high voltage current carrying conductor of the joint under different ambient temperatures are fitted. The ultimate safe current carrying capacity of the joint under the different ambient temperatures can be calculated by using these related functions. The results show that the increase of ambient temperature has little effect on the temperature distribution trend of the high voltage conductor surf