非周期分量导致TA暂态饱和延时的分析

Calculation and Analysis on Transient Saturation of Current Transformer Caused by Non-periodic Components

电流互感器(TA)暂态饱和是目前系统中普遍存在的问题,TA的暂态饱和与TA中的剩磁以及TA短路电流中的非周期分量密切相关。当一次电流包含有长时间的非周期分量时,可能使铁心深度饱和,但饱和出现的时间有时延。通过实例计算分析了TA暂态延时饱和过程,并论述了减小TA饱和对保护装置影响的改进措施。

Transient saturation of current transformer is an ubiquitous problem which is in connection with non-periodic components and residual magnetism. Non-periodic components of current transformer will cause the saturation of CT core, and the saturation appears with time-delay. This paper analyses transient saturation process of current transformer and discusses the to impact on the protection by reducing TA saturation.