非周期分量对电流互感器暂态饱和的影响  

Influence of non-periodic components on transient saturationof current transformer

作　　者：李艳鹏[1] 侯启方[1] 刘承志[1] 

机构地区：[1]西南交通大学电气学院,四川成都610031

出　　处：《电力自动化设备》2006年第8期15-18,共4页Electric Power Automation Equipment

摘　　要：电流互感器一次侧电流中含有非周期直流分量时,会发生暂态饱和,致使二次侧电流波形失真,从而引起继电保护装置的误动或拒动。通过对非周期直流分量电流引起的电流互感器暂态饱和励磁电流进行计算,对电流互感器的暂态饱和特性进行了分析。利用Matlab仿真软件搭建了仿真实验模型,通过改变一次侧电流中非周期直流分量的方向,研究了非周期直流分量对电流互感器的饱和方向、入饱和时间的影响。最后,通过仿真比较说明了在含有不同方向非周期分量时电流互感器的暂态饱和特性。Transient saturation of CT（Current Transformer） will take place when its primary current contains DC component,which may cause distorted secondary operations of relay protections. By calculating the excitation current waveforms and incorrect current of CT caused by DC component,its transient saturation behavior is analyzed. Based on the simulation model established with Matlab,influences of DC component on the saturation direction and start time are studied by changing the direction of DC component. By comparing simulation results,the transient saturation behavior of CT caused by non-periodic components in different directions is explained.

关 键 词：电流互感器 非周期分量 暂态饱和 Matlab/PSB仿真 

分 类 号：TM452[电气工程—电器]