牵引变电所变压器比率差动保护误动作分析  

Analysis on Mis-operation of Transformer Ratio Differential Protection in Traction Substation

作　　者：王帅 余晓光 肖新伟 Wang Shuai;Yu Xiaoguang;Xiao Xinwei(不详)

机构地区：[1]南京铁道职业技术学院

出　　处：《变频器世界》2021年第1期101-104,共4页The World of Inverters

基　　金：南京铁道职业技术学院大学生创新训练计划项目(202013106013Y)。

摘　　要：本文通过对沪汉蓉线某牵引所主变差动保护误动作的分析,得出在区外故障时短路电流中非周期分量能够引起电流互感器暂态饱和,从而导致差动保护误动作,最后在分析传统比率差动保护二次谐波制动闭锁的基础上增加了闭锁判据。Based on the analysis of main transformer differential protection maloperation in a traction substation of Hu Hanrong railway,it is concluded that the non-periodic component of short-circuit current can cause the transient saturation of current transformer,which leads to the mis-operation of differential protection.Finally,based on the analysis of the secondary harmonic braking locking of traditional ratio differential protection,a blocking criterion is added.

关 键 词：比率差动保护 闭锁 非周期分量 二次谐波 

分 类 号：U264.3[机械工程—车辆工程]