Core Points - The Qinghai-Henan ±800 kV UHVDC project has successfully completed its annual maintenance, ensuring reliable power supply for the upcoming winter peak [1][2] - This project is the world's first long-distance transmission corridor for renewable energy and plays a crucial role in China's "West-to-East Power Transmission" initiative [1] - Since its operation, the project has delivered 86.8 billion kWh of clean electricity to Henan, significantly reducing coal consumption and carbon emissions [1] Group 1 - The annual maintenance of the Qinghai section of the UHVDC project was conducted to ensure the safety and reliability of the power grid [2] - A total of 500 maintenance personnel were involved in the inspection of the converter station and the 231 km DC line, covering 433 towers [2] - The maintenance work included a comprehensive evaluation of equipment status and the development of a detailed maintenance plan to ensure safety and quality [2]

Core Insights - The Qinghai-Henan ±800 kV UHVDC project has successfully completed its annual maintenance, ensuring reliable power supply for the upcoming winter peak demand and promoting efficient development and utilization of renewable energy in Qinghai [1] Group 1: Project Overview - The Qinghai-Henan UHVDC project is the world's first long-distance transmission corridor for renewable energy and is a crucial part of China's "West-to-East Power Transmission" initiative [1] - The project spans 1,587 kilometers, starting from Hainan Tibetan Autonomous Prefecture in Qinghai and ending in Zhumadian City, Henan, passing through four provinces [1] - Since its operation, the project has delivered a total of 86.8 billion kWh of clean electricity to Henan, equivalent to a reduction of 39.06 million tons of standard coal consumption and a decrease of 64.23 million tons of CO2 emissions [1] Group 2: Maintenance and Safety Measures - The annual maintenance for the Qinghai section began on September 15, involving over 500 maintenance personnel and 10 teams conducting comprehensive inspections of the converter station and 231 kilometers of direct current lines [4] - A systematic assessment of equipment status was conducted prior to maintenance, leading to the development of a scientific and comprehensive maintenance plan [4] - Strict safety protocols were implemented, including a "Ten No Work" safety guideline and a three-level acceptance system to ensure safety and quality throughout the maintenance process [4] Group 3: Technological Advancements - This year's maintenance saw the first large-scale use of drones for tasks such as grounding line installation and data collection, enhancing data accuracy and operational efficiency [5] - Upgrades were made to the intelligent inspection system and infrared dual-vision system at the Qingnan converter station to improve equipment status perception and defect identification accuracy [5]