我国自研高性能变压器保护技术规模化应用

Core Insights - The China Electric Power Research Institute has developed a "high-performance transformer inter-turn protection technology" that has been successfully applied in the State Grid Corporation's UHV and HVDC converter stations, addressing a long-standing technical challenge in the industry [1][2] - This technology has received the first prize of the State Grid Corporation's 2025 Science and Technology Progress Award, highlighting its significance in enhancing the safety and stability of large-scale AC and DC power grids [1] Group 1 - The transformer is a critical component in UHV and HV transmission systems, and its unique winding structure can lead to severe faults if minor inter-turn issues are not addressed quickly, posing risks to equipment and system safety [1] - Existing technologies have a response time of 50-60 milliseconds due to the complexity of fault processes, necessitating significant improvements in performance to reduce fault energy accumulation at high voltage levels [1] - The research team, guided by the State Grid Corporation, focused on key challenges in transformer protection principles and developed a new principle based on phase sequence differential current characteristics, reducing the protection response time to 20 milliseconds [1][2] Group 2 - Since 2022, the developed transformer protection technology has been implemented in 21 UHV and HVDC converter stations, with over 2000 units operating successfully [2] - The project has achieved a full-chain innovation from theoretical research to large-scale application, enhancing the protection technology of domestic high-end equipment and significantly improving transformer safety levels [2] - Under the "dual carbon" goals, this core technology will continue to support the safe and stable operation of China's large-scale AC and DC power grids, ensuring reliable electricity supply [2]