注入式定子接地保护在大型水电机组上的应用分析  

Application and Analysis of Injection-type Stator Earth Fault Protection for Large Hydroelectric Unit

作　　者：凌洪政 韩海彦 陈佳胜[2] 张琦雪[2] 

机构地区：[1]龙滩水电开发有限公司,广西天峨547300 [2]南京南瑞继保电气有限公司,江苏南京211106

出　　处：《红水河》2009年第4期80-83,共4页Hongshui River

摘　　要：介绍龙滩水电站注入式定子接地保护方案的构成,分析了保护原理及特点,阐述了注入式定子接地保护的几项关键技术以及在工程实际应用中应注意的注意事项,综合考虑发电机中性点接地变实际参数对接地电阻计算的影响,结合在700 MW水电机组上实际模拟单相接地的试验数据,验证了方案的有效性和可靠性。The scheme of injection-type stator earth fault protection for Longtan Hydropower Station is introduced. Scrne key techniques involved are elaborated, and some precautions in its application to engineering pmctiee are provided. Aceording to the single-phase stator earthing experiment on some large hydraulic generators in China, the SEF （Stator Earth Fault） protection using injected low frequency signals is proved to be useful and practical.

关 键 词：注入式定子接地保护 安全电流限制 阻抗精确补偿 龙滩水电站 

分 类 号：TM772[电气工程—电力系统及自动化]