电力系统自动化Issue(3)：129-134,6.DOI:10.7500/AEPS20150522004
变压器空投导致相邻元件差动保护误动分析及防范措施
Analysis on Mal-operation for Current Differential Protection Due to Adjacent Transformer Switching-on and Its Countermeasures
摘要
Abstract
Cases of unusual mal-operation of differential protection for transformer,generator and transmission line in operation due to adjacent transformer switching-on have seriously threatened the safe and stable operation of the power grid.An investigation is made on the causes of mal-operation by analyzing the main factors,such as magnetizing inrush,sympathetic inrush,and current transformer saturation,including field recorded fault data and simulation results.It is pointed out that the current transformer transient or current transformer local transient saturation induced by the long-lasting aperiodic component from the magnetizing inrush current is the major cause of mal-operation.To solve this problem,the harmonic restraining criterion and the improved ratio restrained characteristic of current differential protection are proposed to avoid this sort of mal-operation.The research results are verified by field recorded fault data and simulation results.关键词
和应涌流/励磁涌流/差动保护/电流互感器/局部暂态饱和Key words
sympathetic inrush/magnetizing inrush/differential protection/current transformer/local transient saturation引用本文复制引用
戚宣威,尹项根,张哲,王奕,张健..变压器空投导致相邻元件差动保护误动分析及防范措施[J].电力系统自动化,2016,(3):129-134,6.基金项目
国家自然科学基金资助项目(51277084,51177058) （51277084,51177058）
中国南方电网有限责任公司科技项目(K-GD2012-324)。This work is supported by National Natural Science Foundation of China (No.51277084,No.51177058) and China Southern Power Grid Company Limited(No.K-GD2012-324) （K-GD2012-324）
