Study on the influence of current on 500 kV AC marine cable based on numerical simulation

Due to the extremely complex changes in marine environmental factors and frequent changes in the actual load current of the submarine cable, it is necessary to analyze and study the mechanical and thermal characteristics of the high-voltage submarine cable system under different conditions to ensure the reliability of the power transmission performance of the submarine cable. In this paper, the finite element model is adopted to study the physical parameters of the submarine cable, taking burial depth, ambient temperature, and current as dependent variables. Some of the parameters related to the environment refer to the ocean currents near Zhoushan, and the model bases on the actual current and temperature data of the 500 kV AC submarine cable. The results show that in order to increase the load capacity of the submarine cable and reduce the thermal strain of the submarine cable, the heat dissipation of the submarine current should be increased, so the buried depth should be appropriately reduced. After the ambient temperature rises, in order to reduce the loss of electric energy and cable deformation, the carrying current should be reduced moderately. The research carried out a simulation based on the actual physical parameters of each layer of the submarine cable and predicted the changes in the submarine cable in Zhoushan with different current carrying capacity in different seasons, so it has reference significance in actual engineering applications.