我国超高压断路器技术取得重大突破

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].