摘要
为了分析电流互感器铁心饱和对继电保护的影响,结合一起电流互感器饱和造成差动保护误动的实例,采用谐波分析的方法,介绍了电流互感器的稳态饱和特性和暂态饱和特性,总结了电流互感器剩磁和一次电流非周期分量对电流互感器暂态饱和的影响,分析了电流互感器饱和对差动保护,速断保护等造成的影响,给出了限制短路电流,减少电流互感器二次负担,采用PR电流互感器等方法能有效的减少电流互感器饱和对继电保护装置的影响。
In order to analyze the influence of current transformer saturation on relay unit, by means of harmonic analysis method, steady state characteristics and transient characteristic of current transformer saturation are introduced in combination with a example of differential protection misoperation caused by current transformer saturation. The influence of residual mag- netism and primary current aperiodic componenton on current transformer transient state saturation is summaried. The influence of current transformer saturation on the operation of differential protection and over current protection is analyzed. Some preventive measures such as restriction of the short-circuit current, selection of the right current transformer and reduc- tion of the current transformer load are also discussed tO reduce the influence of the current transformer saturation on relay u-nit.
出处
《现代电子技术》
2012年第24期191-194,共4页
Modern Electronics Technique
关键词
电流互感器
继电保护
铁心饱和
谐波分析
current transformer
relaying protection
saturation
harmonic analysis
