Abstract
Since the temperature distribution, electric field distribution and steady-state current-carrying capacity of HVDC (high-voltage direct-current) cables affect each other, the temperature field and electric field should be taken into account when calculating the current-carrying capacity. In addition, in the actual operation of submarine cables, not only their own characteristics but also the impact of the laying conditions on the cable current-carrying capacity should be considered. In this paper, COMSOL Multiphysics is used to calculate the temperature and electric field distribution of ± 500 kV XLPE (cross-linked polyethylene) HVDC submarine cable. By comparing the results of the simulation with the equivalent thermal circuit model, the validity of the heat transfer algorithm applied to engineering practice is verified. And the temperature field models of submarine cables in seawater section, directly buried section and submarine section are established. Through the simulation calculation of the overall model, the effects of soil thermal conductivity and seawater temperature on current-carrying capacity under different laying modes are obtained, and the conclusion that the bottleneck section of the current-carrying capacity of DC submarine cables is directly buried is drawn. The current-carrying capacity analysis method and conclusion of ± 500 kV submarine cable presented in this paper can provide a theoretical basis for HVDC submarine cable transmission.
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