一起发电机定子接地保护动作引起机组跳闸事件的分析  

Analysis of a Case of Undesired Trip of an Actual Generator Unit Caused by Action of Stator Grounding Protection

作　　者：余虎 YU Hu(Taishan Nuclear Power Joint Venture Co.,Ltd.,Jiangmen 529228,China)

机构地区：[1]台山核电合营有限公司,广东江门529228

出　　处：《电工技术》2024年第15期160-161,165,共3页Electric Engineering

摘　　要：某大型发电机组在并网前空载时发生定子接地保护动作跳机事件,该定子接地保护为双重化配置。通过检查微机保护装置动作报告、故障录波文件、定子接地保护逻辑及定值设置情况,初步判断定子接地保护正确动作。进一步检查发现故障原因为发电机端PT二次侧接线端子装反引起PT二次回路相对地短路故障。This paper is a report and analysis on an event of stator grounding protection trip encountered by a large generator during pre-grid-connection no-load operation,in which the stator grounding protections are dual configurations.By checking the action reports of relay protection devices,the fault record files,and the stator grounding protection′s logic and setting,is was preliminarily determined that the action of protection was correct.Further inspection found that the fault cause was the phase-to-ground short circuit of the PT secondary circuit caused by reverse installation of PT secondary terminal.

关 键 词：定子接地 端子 PT二次回路 

分 类 号：TM623.7[电气工程—电力系统及自动化]