我国首次实现5000米级高海拔超高压等电位带电作业

Core Insights - The State Grid Qinghai Electric Power Company successfully conducted ultra-high voltage live working at an altitude of 5211.5 meters near the Tangula Mountain Pass, addressing defects in the ±400 kV Chaila DC line, thereby strengthening the power supply for Tibet during the Spring Festival [1][3] Group 1 - The oxygen level at the repair site was only 40% of that at plain areas, with temperatures dropping to minus 20 degrees Celsius [3] - The use of "drone + electric lift" technology enabled efficient defect repair, setting a world record for ultra-high voltage live working at high altitudes [3] - This operation marks the first time such work has been conducted in a high-altitude area above 5000 meters in China, showcasing the country's capabilities in power grid maintenance under extreme conditions [3] Group 2 - The Qinghai-Tibet interconnected project, operational since the end of 2011, has resolved issues of winter power shortages and summer hydropower consumption difficulties in Tibet [3] - The Chaila DC segment has an average altitude exceeding 4000 meters, making maintenance extremely challenging [3] - This operation provides strong power support for local livelihood and economic development [3]