Core Viewpoint - 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 [2] Group 1: Operational Achievements - The oxygen level at the repair site was only 40% of that at sea level, with temperatures dropping to -20°C [2] - The use of a "drone + electric lift" technology combination allowed for efficient defect repair [2] - This operation set a world record for ultra-high voltage live working at high altitudes and marked the first such operation in a 5000-meter elevation area in China [2] Group 2: Project Significance - The Qinghai-Tibet interconnected project, operational since the end of 2011, has resolved issues of winter electricity shortages and summer hydropower consumption difficulties in Tibet [2] - The Chaila DC segment has an average elevation exceeding 4000 meters, presenting significant operational challenges [2] - This operation demonstrates the capability of China's power grid maintenance in extreme environments, providing strong electrical support for local livelihoods and economic development [2]

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]