断路器后备保护和大短路电流下的上下级选择性研究  

Research on the Backup Protection and Selectivity of Upper Circuit Breakerand Lower ircuit Breakerin Case of High Short-circuit Current

作　　者：陈科 CHEN Ke(Schneider Electric(China)Co.,Ltd.,Wuxi 214000,Jiangsu Province,China)

机构地区：[1]施耐德电气(中国)有限公司,江苏省无锡市214000

出　　处：《建筑电气》2024年第6期26-32,共7页Building Electricity

摘　　要：引入电流三区段概念,主要分析在选择性极限电流I_(s)超过上级断路器短路保护阈值时的上下级选择性问题,并就实际工程应用给出相关建议。The concept of current three-section is introduced,the selectivity of upper circuit breaker and lower circuit breaker when the selectivity-limit current I_(s) exceeds the threshold for short-circuit protection of the upper circuit breaker is analyzed,and relevant suggestions forpractical engineering gapplication are proposed.

关 键 词：断路器串联回路 选择性 电流三区段 选择性极限电流 选择性配合表 断路器极限分断能力 后备保护 保护配合 

分 类 号：TM561[电气工程—电器]