区外故障引起500kV主变纵差保护误动的分析  

Analysis of 500 kV Main Transformer Longitudinal Differential Protection Malfunction Caused by External Fault

作　　者：蒋琛[1] 严鹏志 喻建[1] 叶渊灵 

机构地区：[1]江苏方天电力技术有限公司,江苏南京211102

出　　处：《江苏电机工程》2015年第5期12-14,共3页Jiangsu Electrical Engineering

摘　　要：介绍一起因区外单相故障引发的500 kV自耦变压器纵差保护误动事故,从此类型国外纵差保护原理入手,分析了误动原因,并对同类型的主变纵差保护在电网中的应用提出建议。A 500 kV autotransformer longitudinal differential protection malfunction caused by an external single phase fault is introduced in this paper. The Differential protection principles of the imported equipment are studied, and the reasons for the malfunction are analyzed. Improvement recommendations is presented for similar protection devices in the power grid.

关 键 词：自耦变压器 纵差保护 误动 极性 电流互感器 

分 类 号：TM772[电气工程—电力系统及自动化]