Core Points - The world's first 800 kV large-capacity circuit breaker has been successfully developed, marking a significant achievement in electrical engineering [1][2] - The new circuit breaker addresses the issue of excessive short-circuit current in the 750 kV grid, which is crucial for the development of large-scale renewable energy integration and ultra-high voltage transmission [1] Group 1 - The 800 kV/80 kA circuit breaker was developed by a collaboration of several organizations, including State Grid Shaanxi Electric Power Company and Henan Pinggao Electric Co., Ltd [1] - The product has passed technical appraisal by the China Electrotechnical Society, confirming its international leading performance parameters [2] - The circuit breaker is designed to be compatible with existing equipment dimensions, allowing for direct replacement and upgrades, which will significantly enhance the efficiency and cost-effectiveness of grid capacity expansion [2] Group 2 - The development involved innovative simulation models and parameter measurement platforms, leading to the creation of a dual-break arc extinguishing chamber [1] - A new graphene contact material was invented to meet the 20-cycle electrical life requirement, addressing the challenge of arc erosion at 80 kA [1] - The operating mechanism of the circuit breaker features "high-speed breaking + good buffering," overcoming technical challenges in optimizing large-capacity breaking and operating characteristics [1]

"新产品性能参数国际领先，并且与现有设备尺寸完全一致，可直接替换升级，将大幅提升电网增容改 造的效率和经济性。"国网陕西省电力有限公司首席专家盛勇说，该断路器投运后，将进一步提升西北 电网应对极端短路电流的能力，支撑能源集群外送电网网架安全稳定运行，为我国主干电网的安全提供 支撑。 （文章来源：人民日报） 由国网陕西省电力有限公司联合河南平高电气股份有限公司、西安交通大学、中国电力科学研究院、中 国电气装备集团科学技术研究院有限公司等单位研制的800千伏/80千安大容量断路器，近期通过中国电 机工程学会的新产品技术鉴定，标志着世界首台800千伏大容量断路器研制成功。 随着西北电网750千伏主网加速建设、大规模新能源接入及特高压外送跨越式发展，750千伏电网短路电 流超标问题逐渐凸显。国网陕西省电力有限公司瞄准电网需求，2024年依托国家电网科技项目启动研 发，团队创新建立仿真计算模型和参数测量平台，通过多轮计算和试验的迭代优化，研制出800千伏/80 千安双断口灭弧室。同时，发明研制出耐电烧蚀的新型石墨烯触头材料，满足800千伏/80千安断路器20 次电寿命要求，解决开关触头耐受80千安电弧烧蚀难题；研制出满 ...