China's leading submarine optical cable and submarine cable manufacturer JSZT Submarine Cable Technology Group fully masters the core technology of high-voltage DC submarine cables. The products have been applied to China Southern Power Grid Nanao ±160kV, State Grid Zhoushan ±200kV, State Grid Xiamen ±320kV, and Three Gorges Rudong The construction of four advanced flexible DC transmission demonstration projects of ±400kV represents China's first successful development of ultra-high voltage ±525kV flexible DC cables, realizing the "five-level jump" of the domestic development of flexible DC cables in China, and continuously realizing self-leaping.
The jointless cable produced by it over 18 kilometers set a world record.