【资料图】 通过该工程，我国自主掌握了750千伏电网的设计、设备制造、施工、调试和运行的全部核心技 术，形成国内标准和技术规范，成为世界上少数掌握750千伏超高压输变电成套技术的国家之一，为 2010年750千伏新疆与西北联网工程的投运提供了先行经验。 标签： 工程 750 电网 千伏 水电 输变电 全国 2003年9月19日，该工程正式开工。工程起自青海省民和县官亭镇750千伏官亭变电站，至甘肃省兰 州市榆中县750千伏兰州东变电站，线路全长141千米，设计输送容量1500兆伏安。 2005年9月26日，工程建成投运，陕西、甘肃、青海、宁夏电网实现首次互联，西北750千伏主网架 初具雏形，黄河上游丰富的水电、风光能源终于找到了外送的"高速公路"。工程也彻底终结了我国电网 没有500千伏以上电压等级的历史，为我国特高压技术发展奠定了坚实基础。 全国首个750千伏输变电工程——官亭—兰州东输变电示范工程日前迎来投运20周年。20年来，这 条线路累计输送电量超1500亿千瓦时，在服务黄河梯级水电外送、助推经济社会发展方面作出了巨大贡 献。 ...

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]