电子脱扣器用电流互感器小型化方案及设计  

Miniaturization design on current transformer for electric trip unit

作　　者：郑庆杰[1] 陈为[1] 张丽萍[1] ZHENG Qing-jie;CHEN Wei;ZHANG Li-ping(College of Electrical Engineering and Automation,Fuzhou University,Fuzhou 350108,China)

机构地区：[1]福州大学电气工程与自动化学院

出　　处：《磁性材料及器件》2020年第1期14-17,65,共5页Journal of Magnetic Materials and Devices

摘　　要：在低压输配电系统中塑壳断路器(MCCB)的电子脱扣器逐步取代传统的机械热磁式脱扣装置,电流互感器(CT)在电子脱扣器(ETU)中发挥着取能和电流侦测的双重作用。为了适应电子脱扣器小型化和低成本的要求,提出了一种新的电流互感器设计思路,通过降低其饱和点来减小体积,同时利用饱和时互感器的输出电流峰值来侦测过载电流并提供触发信号给控制系统。通过理论分析、Saber软件仿真和测试,验证了所提出的小型化方案及其设计的可行性。The moulded case circuit breaker(MCCB)electric trip unit(ETU)is replacing thermal magnetic tripping device in low voltage power distribution,current transformer(CT)is the key component for power harvesting and current sensing in ETU.This paper proposes a new current transformer design method for miniaturization and low cost requirements.It decrease saturation point to reduce CT volume,and use the peak value of saturated CT output current for overload current sensing at the same time,and send the trip signal to control system.Based on the theoretical analysis,Saber simulation and verification,it could prove that the current transformer miniaturization design is feasible in electric trip unit.

关 键 词：塑壳断路器 电子脱扣器(ETU) 电流互感器(CT) 取能 过流保护 

分 类 号：TM55[电气工程—电器]