Effect of Laying Spacing on Current Carrying Capacity of Cross Linked Polyethylene AC Submarine Cables

Under the guidance of the national dual carbon policy, China’s offshore wind power industry has ushered in a golden age of rapid development. At the same time, with the development of marine resources gradually developing into deep-sea, laying and operating environment of submarine cables are becoming more and more complex. Due to the impact of marine routing resources and construction, laying spacing of submarine cables is different, and the impact on its current carrying capacity is also different. It is necessary to analyze the influence of different laying spacing on current carrying capacity of submarine cables under complex working conditions. Based on IEC 60287-1-1: 2023, conventional laying conditions of 220 kV AC cross linked polyethylene (XLPE) submarine cables were taken as an example, and CYMCAP software was used to calculate and analyze current carrying capacity. Results showed that current carrying capacity of the cable decreased with the decrease of laying spacing, and decreasing range increased with the decrease of laying spacing. Under the conditions of land cable trench, due to space constraints in the laying environment, laying spacing had a long-term influence on current carrying capacity of submarine cables, and the influence degree decreased with the increase of cable trench size. When laying spacing was less than 1 times of cable diameter, the influence of current carrying capacity was the largest, and when the distance was greater than 1 times of cable diameter, the influence of current carrying capacity was basically stable.