和应涌流引起差动保护误动仿真分析  

Simulation on Mal-operation of Differential Protection Caused by Sympathetic Inrush

作　　者：孙世勇[1] 翟君毅[1] 姚楠[1] 王临宁 王伟利[1] 

机构地区：[1]国网河南省电力公司平顶山供电公司,河南平顶山467000

出　　处：《山东电力技术》2015年第3期66-68,共3页Shandong Electric Power

摘　　要：针对和应涌流引起变压器差动保护误动的事故,从磁链角度分析了和应涌流产生的机理。利用EMTP软件建立模型进行仿真,验证了和应涌流本身不会造成变压器差动保护的误动,而CT饱和是误动的重要因素,并对差动电流进行详细的谐波分解,发现在误动期间二次谐波含量很小而三次谐波含量较高的特征。In view of the mal-operation of differential protection caused by sympathetic inrush,mechanism of the sympathetic inrush is analyzed from the view point of magnetic flux linkage.Then simulation model is established by EMTP with the aim to attest the fact that sympathetic inrush can not lead to mal-operation of differential protection and that the CT saturation is an important factor for the mal-operation.Finally,by analyzing the harmonic of differential current,characteristic is discovered that the third harmonic is more than the second harmonic during the mal-operation.

关 键 词：和应涌流 EMTP仿真 谐波 

分 类 号：TM77[电气工程—电力系统及自动化]