Temperature is a direct factor limiting the current carrying capacity of cable joints

thus studying the temperature field distribution of cable joints was critical to achieving an accurate assessment of the current carrying capacity of cable joints. We established a two-dimensional axial simulation model of joints and analyzed the temperature field of joints under different loads. Then

we designed the steady-state temperature rise experiments of cable joints

and measured the steady temperature distribution of joints under different loads. Finally

we adopted the two-dimensional axial joint simulation model to study the influences of the ambient temperature

the convective heat transfer coefficient

the main pieces of insulation

and protective shell filled with plastic thermal conductivity changes on the steady-state temperature distribution in the joints

and then put forward a full range of cable ampacity promotion strategies. The comparisons between the experimental results and the simulation results show that the absolute errors of the conductor temperature calculated by the two-dimensional axial simulation model of joints under different loads are less than 10%. Thus

adopting the two-dimensional axial simulation model of joints to calculate the temperature field distribution of cable joint can meet the requirements of engineering application.