全国首个750千伏输变电工程20年送电超1500亿千瓦时

Core Insights - The Guanting-Lanzhou East Transmission and Transformation Demonstration Project marks its 20th anniversary, having transmitted over 1500 billion kilowatt-hours of electricity, significantly contributing to the development of the Yellow River cascade hydropower and the socio-economic growth of the region [1] Project Overview - The project commenced on September 19, 2003, starting from the 750 kV Guanting Substation in Minhe County, Qinghai Province, to the 750 kV Lanzhou East Substation in Yuzhong County, Gansu Province, covering a total length of 141 kilometers with a designed transmission capacity of 1500 MVA [1] - The project was completed and put into operation on September 26, 2005, enabling the first interconnection of the power grids in Shaanxi, Gansu, Qinghai, and Ningxia, laying the foundation for the northwest 750 kV main grid framework [1] Technological Impact - The project ended the history of China's power grid lacking voltage levels above 500 kV, establishing a solid foundation for the development of ultra-high voltage technology in the country [1] - Through this project, China has independently mastered all core technologies related to the design, equipment manufacturing, construction, debugging, and operation of the 750 kV power grid, forming domestic standards and technical specifications [1] - The project positioned China as one of the few countries in the world capable of complete 750 kV ultra-high voltage transmission and transformation technology, providing valuable experience for the operation of the 750 kV Xinjiang and Northwest interconnection project in 2010 [1]