外部恒定磁场对电流互感器传变特性影响分析  

Impact of external constant magnetic field on transfer characteristics of current transformer

作　　者：刘钢[1] 付志红[1] 侯兴哲[2] 郑可[2] 欧习洋[2] 

机构地区：[1]重庆大学输配电装备及系统安全与新技术国家重点实验室,重庆400044 [2]重庆市电力公司电力科学研究院,重庆401123

出　　处：《电力自动化设备》2013年第11期100-104,共5页Electric Power Automation Equipment

摘　　要：通过分析电流互感器(TA)与永磁铁的相对位置,推导了外部恒定磁场对TA传变特性影响的定量关系式,并得出了以下结论:外部恒定磁场对TA的影响在有恒定交链磁通绕组处与直流偏磁相似,随着外部磁感应强度增加,TA传变误差增大,同时在输出中产生大量谐波,严重影响电能计量的结果。Abstract：By analyzing the position of CT（Current Transformer） relative to permanent magnet,the quantitative relationship between the external constant magnetic field and its impact on the transfer characteristics of CT is deduced and the conclusions are obtained：the impact of external constant magnetic field on the transfer characteristics of CT is similar to that of DC bias at the windings with constant linkage flux,the transfer error of CT increases along with the increase of external magnetic induction intensity,and there is a great deal of harmonics in its output signal,seriously affecting the measurements.

关 键 词：电流互感器 永磁铁 外部恒定磁场 传变特性 

分 类 号：TM93[电气工程—电力电子与电力传动]