Core Viewpoint - The successful development of the world's first 800 kV/80 kA large-capacity circuit breaker marks a significant advancement in high-voltage large-capacity breaking technology, addressing the issue of excessive short-circuit current in the 750 kV grid in Northwest China [1][3][7]. Group 1: Product Development and Technical Achievements - The 800 kV/80 kA circuit breaker has passed technical appraisal by the China Electrotechnical Society, with the committee acknowledging its comprehensive performance indicators as reaching international leading levels [1]. - The project faced multiple technical challenges, including a 60% increase in short-circuit current energy and a 27% rise in the recovery voltage rise rate, necessitating significant improvements in the mechanical performance of core components [5]. - The project team developed a high-precision simulation model for the entire breaking process and established an advanced arc measurement system to accurately understand the characteristics of arcs under high voltage and current conditions [5]. Group 2: Industry Impact and Future Prospects - The new circuit breaker is designed to directly replace existing equipment, significantly enhancing the efficiency and economic viability of grid capacity upgrades [7]. - Once operational, the circuit breaker will improve the Northwest grid's ability to handle extreme short-circuit currents, supporting the safe and stable operation of the main power grid in China [7]. - The development aligns with the accelerated construction of the 750 kV main grid and the large-scale integration of renewable energy, addressing the growing challenges posed by short-circuit current issues [3].

Core Viewpoint - The successful development of the 800 kV/80 kA large-capacity circuit breaker marks a significant advancement in China's high-voltage large-capacity breaking technology, addressing the issue of excessive short-circuit current in the 750 kV grid in the northwest region [1][3]. Group 1: Product Development - The 800 kV/80 kA circuit breaker has passed the new product technical appraisal organized by the China Electrotechnical Society, with the committee agreeing that its comprehensive performance indicators reach an internationally leading level [1]. - The project was initiated by State Grid Shaanxi Electric Power Company, targeting the needs of the power grid and focusing on the development of key technologies and equipment for short-circuit current interruption [3]. - The development process faced multiple technical challenges, including a 60% increase in short-circuit current energy and a 27% rise in recovery voltage rate, necessitating significant improvements in the mechanical performance of core components [3][5]. Group 2: Technical Innovations - The project team conducted arc theory research and simulation testing, establishing a high-precision simulation model for the entire interruption process of the 800 kV circuit breaker [5]. - Innovations included the application of erosion-resistant graphene contact materials, which meet the requirement for 20 operational cycles at 80 kA, addressing the challenge of component erosion from high-current arcs [5]. - The successful development of the circuit breaker took 23 months, resulting in a product that is compatible in size with existing equipment, allowing for direct replacement and upgrades, thereby enhancing the efficiency and cost-effectiveness of grid capacity expansion [5]. Group 3: Industry Impact - The introduction of the 800 kV/80 kA circuit breaker will significantly enhance the northwest grid's ability to handle extreme short-circuit currents, supporting the safe and stable operation of the energy cluster transmission grid [5]. - This advancement provides strong equipment support for the safe and stable operation of China's main power grid [5].