一起区外故障引起220 kV主变压器差动保护动作的分析  

Analysis of Differential Protection Action of 220 kV Main Transformer Caused by an Out-of-area Fault

作　　者：王会增 王乐 齐肖彬 WANG Huizeng;WANG Le;QI Xiaobin(UHV Branch of State Grid Hebei Electric Power Co.,Ltd.,Shijiazhuang,Hebei 050071,China)

机构地区：[1]国网河北省电力有限公司超高压分公司,河北石家庄050071

出　　处：《山西电力》2023年第4期36-38,共3页Shanxi Electric Power

摘　　要：介绍了一起区外故障引起主变压器差动保护越级跳闸事故的相关情况,通过对现场相关保护设备、二次回路进行特性试验、绝缘试验及测量,并对保护装置动作报告和事故录波进行分析,确定是变压器高压侧中性线接触不良,故障时无自产零序电流,高压侧电流发生畸变,而导致的差动保护跳闸。得出的结论为保护正确动作。In this paper,the related situation of a major transformer differential protection tripping accident caused by an outof-area fault is introduced.Based on the characteristics test,insulation test and measurement of the field related protection equipment and secondary circuit,and an analysis of the action report of protective device and accident recording,it is determined that the neutral line on the high voltage side of the transformer is in poor contact.As there is no self-generated zero sequence current at fault and the high voltage side current is distorted,differential protection trip occurs.The conclusion is that this is the correct protection action.

关 键 词：主变压器 差动保护 区外故障 零序电流 

分 类 号：TM774[电气工程—电力系统及自动化]