轨道交通主变电所主变差动保护误动事故分析  

Analysis of a Maloperation Accident of Main Transformer Differential Protection of Rail Transit Main Substation

作　　者：刘宁宁[1] 韩本帅[2] LIU Ningning;HAN Benshuai(School of Electrical Engineering,Shandong University,Jinan 250061,China;Shandong Electric Power Engineering Consulting Institute,Jinan 250061,China)

机构地区：[1]山东大学电气工程学院,山东济南250061 [2]山东电力工程咨询院有限公司,山东济南250061

出　　处：《电工技术》2020年第11期74-76,共3页Electric Engineering

摘　　要：介绍一起区外故障引起的轨道交通主变电所主变差动保护误动作事故,对故障原因进行分析,并给出了整改措施。阐述了两种主变电所接地变的接线形式,并进行了对比分析;针对主变低压侧直接T接接地变的形式,应避免因差动保护接线和差动保护程序均未考虑主变低压侧零序电流问题,而导致区外接地故障时主变差动保护误动作情况。A maloperation accident of main transformer differential protection in main substation of rail transit caused by out of area fault was introduced.The cause of the fault,gives the rectification measures was analyzed.Two kinds of connection forms of main substation grounding transformer was introduced.A comparative analysis was made.For the connection form of main transformer with low-voltage side direct T-grounding transformer,it should avoid the main transformer differential protection misoperation caused by out of area grounding fault,because the zero sequence current problem of main transformer low-voltage side was not considered in differential protection connection and differential protection program.

关 键 词：轨道交通 主变电所 差动保护 

分 类 号：TM63[电气工程—电力系统及自动化]