Guest Editorial: Research Progress and Technology Development of HVDC Cable: Part I

High‐voltage direct current (HVDC) cables are growing rapidly all over the world due to the development of offshore wind power interconnections, cross‐island power interconnections, etc. Extensive research has been conducted and many achieve- ments have been made in the study of theoretical issues of HVDC insulation, structural design and manufacture of HVDC cables with the corresponding accessories, as well as in condi- tion monitoring technology. However, as the voltage level of the cable is raised, the transmission capacity is increased and the transmission distance is extended, there are still many chal- lenging problems to be solved, ranging from the material opti- misation and design updates to technological breakthroughs.