Design of Three-Core Enhanced Capacity Submarine Photoelectric Composite Cable with Large Cross-Section and High Voltage

In order to fit strategic deployment of new energy system driven by the “dual-carbon” goal, satisfy requirements of long-distance and large-capacity power transmission, and optimize efficiency and reliability of energy transmission, taking 220 kV main submarine photoelectric composite cable used in a domestic project as an example, structural design and performance analysis were carried out, as well as capacity enhancement structure design of copper wire-steel wire for armored layer. Current-carrying capacity of landing section under ordinary structure and enhanced capacity structure were calculated respectively, and advantages of enhanced capacity structure were obtained. Subsequently, mechanical properties of submarine photoelectric composite cable during laying and salvage were calculated and checked to verify stability and excellence of large cross-section and large-length high voltage submarine photoelectric composite cable properties with enhanced capacity structure. Results showed that submarine photoelectric composite cable with enhanced capacity structure could effectively solve the dual problems of economy and reliability in construction of offshore wind power transmission channel under complex seabed terrain and high corrosion conditions, which could support the large-scale development process of far-reaching sea wind power.