EN
The Jinping—Southern Jiangsu ±800kV UHV DC Transmission Project
Dec.15.2025
The Project is a core backbone channel of China's "West-to-East Power Transmission" strategy. With a total length of 2,059 kilometers, it connects Sichuan's clean energy base with Jiangsu's load center, transmitting over 36 billion kWh of clean electricity annually. Nanjing Electric, as the core equipment supplier of this project, relied on its 88-year technical accumulation in insulator manufacturing to exclusively supply DC glass insulators for the entire line, supporting the project to achieve multiple world-leading breakthroughs with strict quality and technological innovation.
In the project, Nanjing Electric supplied over 400,000 pieces of glass insulators, covering multiple customized models such as LXP-300 and LXZP-300. Targeting the diverse landforms along the project route, including the Western Sichuan Plateau and the Yangtze River Delta, it specially developed core technologies of pollution resistance and anti-icing: by optimizing the glass formula, the dielectric loss value was reduced to below 0.02%; adopting the "large-diameter umbrella skirt + deep rib structure" design, the pollution flashover voltage was increased by 40%, adapting to the foggy and humid environment of the Sichuan Basin and the high salt spray environment of the East China coast. All products passed the ±1000kV lightning impulse test, with the zero-value self-breaking rate controlled within 0.01%, far lower than the 0.1% threshold of international standards.
The stable operation of these insulators provides key support for the project to achieve the world's highest standards of "8 million kW transmission capacity and ±800kV rated voltage", facilitating the efficient transmission of clean energy such as hydropower and photovoltaics from Sichuan to the Yangtze River Delta load center. It can replace 10 million tons of raw coal consumption annually and reduce carbon dioxide emissions by 26 million tons, serving as a benchmark practice for China's energy structure transformation and the achievement of "dual carbon" goals. Nanjing Electric also established its leading position in the global UHV insulator field through its technical performance capability in this project.