Temperature Distribution and Influencing Factors of 110 kV Single Core Cable Joint

To realize the dynamic capacity increase of power cable and accurately grasp the temperature distribution in the weakest cable joint area, a two-dimensional axisymmetric model of 110 kV cable joint is established. The temperature field of cable joint is calculated by finite element method in this paper. The conclusion is: when the ambient temperature is 25 °C and the load current is 1000 A, the hottest spot temperature of cable joint is 80.93 °C, the shell temperature is about 26.37 °C, and the cable core temperature of cable body is about 56.68 °C. The temperature of the cable core inside the cable joint has an approximate exponential relationship with the load current and a linear relationship with the ambient temperature. When the load current is 1100 A, the cable core temperature exceeds 90 °C specified in GB/T 11017.2. Excessive temperature will lead to accelerated aging of the insulation and affect the normal operation life of the cable. This provides a reference for the implementation of power cable dynamic capacity increase measures.