剩磁对电流互感器误差的影响

Influence of Remanence on Current Transformer Error

电力系统用电流互感器是将电力系统中一次侧大电流通过电磁感应原理转换到二次侧小电流,供计量仪表、测量仪表及保护装置使用的一种特殊变压器。计量绕组性能的好坏,对电力系统计量的准确性有着重要影响。因此,从原理上分析电流互感器误差和剩磁产生的原因,针对运行过的电流互感器,结合现场工作经验,归纳产生剩磁的因素,阐述剩磁对电流互感器误差的影响,并提出了减少剩磁的措施。

Current transformer for electrical power system is a kind of special transformer to transfer high current in the grid to metering,measuring instrument and protective device on secondary side of low current.The performance of its metering winding is particularly important for accuracy of metering of the electrical power system.This paper analyzes causes of error and remanence of current transformer from principle,summarizes possible fac tors for remanence for current transformer after operation,represents influencing causes of remanence on error of current transformer and puts forward measures to reduce remanence.