Development of 500 kV XLPE AC Submarine Cables Outdoor Termination

In order to meet the design requirements of submarine cable lines,considering the 500 k V voltage performance requirements and the characteristics of the offshore environment with high pollution and heavy salt fog,the outdoor termination is studied in structural design,electrical insulation design,and the product’s anti-pollution capability is optimized. After the product design is finalized,a verification test is performed to test the electrical performance of the product design,and it successfully passes the type test and pre-qualification test. The electric field distribution design of the submarine cable termination needs to consider the impact of the offshore operating environment,and there is more conductive soluble matter in the pollution of the insulator surface caused by the offshore salt fog. By reducing the electric field strength on the insulator surface,the insulator flashover voltage can be increased. Submarine cable outdoor terminations need to maintain a proper amount of external insulation safety margin compared to land cable outdoor terminations.