Simulation and Experimental Research on Ampacity of Submarine Cables

Abstract

In this paper, 220 kV and 500 square sheathed cable cores are studied. The temperature field distribution and current of the submarine cable are studied from two aspects of experiment and simulation. The results show that the steady-state current of the submarine cable is related to the influencing factors such as seawater temperature, laying depth and soil thermal conductivity, through simulation and experiments, it is concluded that the current of the submarine cable is negatively correlated with seawater temperature and laying depth, and positively correlated with the thermal conductivity of the soil. When the seawater temperature increases by 4 °C, the current of the submarine cable decreases by about 1 %, and the experiment result is lower than the simulation result; when the laying depth decreases by 0.2 m, the current of the submarine cable decreases by about 2 %, and the experimental result is about 3A lower than the simulation calculation result; When the soil thermal conductivity decreases by 0.1 W/km, the current of the submarine cable decreases by 7.2 %. Therefore, the soil thermal conductivity has the most significant impact on the current of the submarine cable; the transient current of submarine cable has great harm to the submarine cable, and the design of submarine cable is key considered; the experimental research and the finite element simulation analysis result are consistent, but there is a certain error, the error is within the correctable range, so the simulation can be used instead of the experiment. Research in this paper includes two parts of experiment and simulation, mutual proof, and can provide reference for future research.