Abstract
A three-dimensional electro-thermal coupling physical and mathematical model of the submarine cable landing section together with the cable trench was established to analyze the effect of the current-carrying capacity improvement scheme of the 500kV submarine cable. The effects of three types of submarine cable landing section current carrying capacity improvement schemes were analyzed and compared. The research results show that the flow rate of the medium around the cable in the cable trench (fluid medium), thermal conductivity, temperature of the cooling medium and the arrangement of the submarine cable affect the current carrying capacity. The fluid medium in the cable trench that is forced to flow along the radial direction of the cable can fully exert the heat absorption effect of the cooling system in the cable trench. The greater the thermal conductivity of the medium around the submarine cable, the Joule heat generated in the submarine cable conductor dissipates more quickly, reducing the temperature rise of the cable conductor, which is beneficial to increasing the current carrying capacity of the submarine cable. The research results have guiding significance for the selection and engineering design of submarine cables.
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