两变压器差动保护同时误动故障分析  

Malfunction of Differential Protection for Main Transformers

作　　者：廖承民[1] 李玉志[1] 杨文佳[1] 王宝秀[1] 张慧峰[1] 唐敏[1] 

机构地区：[1]国网山东省电力公司潍坊供电公司,山东潍坊261021

出　　处：《山东电力技术》2015年第10期57-60,共4页Shandong Electric Power

摘　　要：根据变压器差动保护原理,结合事故报文,利用数学工具对铜集变电站进行变压器差动电流有效值及其二次谐波含量的计算和分析。并针对"姊妹"型变压器安装运行于同一个厂站的接线方式,提出两台变压器差动保护因励磁涌流可能同时动作跳闸的防范措施。According to the principle of differential protection and in combination with accident information,the RMS and second harmonic content of main transformer differential current are calculated and analyzed on the base of mathematical tools in Tongji substation.For the connection mode that ＂sister＂ main transformers are installing and operating in the same plant station, measures of preventing two differential protection devices from tripping because of inrush current are proposed.

关 键 词：备自投装置 差动电流 有效值 二次谐波 励磁涌流 

分 类 号：TM773[电气工程—电力系统及自动化]