Design and test of China first ±160kV DC cable for flexible DC transmission project

"Nan'ao Island ±160kV multiterminal flexible DC transmission Project" developed by China Southern Power Grid is China first project that HVDC submarine cable and land power cable with XLPE insulation have been applied. This paper demonstrates the simulation verification design of the insulation thickness and electric stress of the ±160kV DC cables for this project and proves that the electric stress at any point of insulation complies with the performance of insulation material. And the type test and prequalification test of ±160kV DC cable system are also introduced to prove the long-term reliability of DC power cable and factory splice.