Development and Reliability Validation of J-Tubeless Installation Method for Submarine Cables in Offshore Wind Farms

With the rapid expansion of offshore wind power, the installation and maintenance of submarine cable systems have become critical factors determining project reliability and lifecycle cost. In jacket-type offshore wind foundations, inter-array cables are conventionally routed through steel J-tubes and fixed at the transition piece using hang-off systems. While this approach has been widely applied, operational experience in real marine environments has revealed inherent limitations of the conventional J-tube installation method, particularly related to biofouling, installation delays, and restricted maintainability.