Recently, the 500kV AC-DC bi-characteristic EHV cable for Jiangsu Rudong Offshore (H6, H8 and H10) Wind Power Flexible DC Transmission Project supplied by ZTT Submarine, successfully passed factory acceptance.

Such ultra-high voltage (UHV) high flame-retardant cable with both AC and DC characteristics is both featured with high-quality characteristics of UHV AC cable and capable of withstanding DC working conditions, passing joint acceptance of China Three Gorges New Energy (Nantong) Corp., China General Nuclear Power Group New Energy Nantong Co., Ltd., Jiangsu Safe & Intelligent Transmission Engineering Technology Co., Ltd. and other organization in one-time manner.

ZTT Submarine, as the the supplier of this project, conducted a series of researches on the structural design, performance and process on 500kV AC/DC bi-characteristic cables, and verified the rationality of cable structure and process through tests and effectively controlled the production process to ensure the quality stability of cable products. And high-quality, high electrical performance and flame-retardant sheath materials were used for outer sheathes met the requirements of bunched class a combustion tests upon the testing of authority, and products were found to have high flame-retardant property.

ZTT Submarine, as one of first individual Chinese manufacturing champion companies, extended and applied core R&D technology and process control of large-section, large-length and ultra-high voltage DC cables of high-voltage submarine cable system to offshore power cable system, laying a solid foundation for successful development of 500kV AC-DC bi- characteristic cables and successful pre-factory acceptance.