With the global energy transition accelerating, smart grid and ultra-high-voltage transmission projects have entered a peak construction period, directly driving demand for high-voltage and ultra-high-voltage cables. To meet higher performance requirements, leading domestic cable manufacturers such as Qingdao Hanhe Cable and TBEA are investing heavily in importing or independently developing ultra-clean insulation material production lines, CCV (Catenary Continuous Vulcanization) production lines, and ultra-high-voltage testing systems. The new generation of production lines enables stable mass production of cables rated at 500kV and above, with key performance indicators such as partial discharge levels and long-term voltage endurance lifespan reaching internationally leading standards. Experts from the State Grid Corporation of China state that this wave of technological upgrades will increase the domestication rate of China's high-voltage cables from the current 85% to over 95%, completely eliminating core dependence on a few foreign suppliers and ensuring the autonomous and controllable security of the national energy infrastructure.