一种能改善差动保护性能的辅助电流互感器

An auxiliary current transformer which can improve performance of differential portection

由于微机保护的大量应用,辅助电流互感器的性能优劣直接影响保护动作结果。文中提出一种新型辅助电流互感器,利用其易饱和的特性来提高差动保护躲越区外故障能力,通过对各种保护动作行为的分析,从数学和物理概念两方面证明其不但能改善差动保护在区外故障时的特性,而且不影响区内故障灵敏度,完全可以代替全线性辅助电流互感器。

As to the widely employed digital protection,the performance of auxiliary current transformer has a direct effect on the protection.So a new auxiliary current transformer is proposed.By this current transformer,differential protection can have better ability working under external accident via its easy-saturation characteristics.At the same time,the sensitivity to internal accident is not lowered,which can be verified by the analysis of all involved protection actions and using the mathematical and physical terms.All the characteristics enables our new current transformer to take place of the complete linear auxiliary current transformer without any weakness.