The structure of high-voltage cross-linked polyethylene submarine cable is very complex

and the cable laid in special environment. The method of stratification and the parameter calculation are described in this paper according to IEC 60287 standard. The thermal circuit model and the matrix equation are built up to calculate the temperatures of the conductor and different layers of submarine cable. Finite element method is used to simulate the cable temperature field of different ambient temperature and current

when the ambient temperature is between 14-24 ℃and current value changes between 100-500 A

the deviation between the conductor temperatures calculated by thermal circuit model and finite element simulation is less than 0.3 ℃. Analysis result shows that the calculation accuracy of the temperatures of conductor and different layers can meet the requirements

and it is independent of the ambient temperature. The thermal model provides a reference for the accurate calculation of submarine cable conductor temperature.