RCS-901G高频方向保护拒动原因分析  

Analysis of a Non-operation Fault of the RCS-901G High Frequency Directional Protection

作　　者：余平 姚国明 YU Ping;YAO Guoming(Hubei Qingjiang Geheyan Hydropower Plant, Changyang 443503, China)

机构地区：[1]清江隔河岩水力发电厂,湖北长阳443503

出　　处：《水电与新能源》2020年第6期50-51,共2页Hydropower and New Energy

摘　　要：清江隔河岩水力发电厂500 kV清葛线配置了两套保护,CSC-103B型光纤差动保护和RCS-901G型高频方向保护。但在2018年7月22日发生单相接地故障时,RCS-901G并未启动。经试验分析已知,故障发生时RCS-901G的本站侧因机组未发电为弱电源侧,保护装置采集到的故障电流小,保护启动元件不能动作,而弱馈功能也没投,保护元件不能通过弱馈功能启动。In Qingjiang Geheyan Hydropower Plant,two sets of protections,the CSC-103B optical fiber differential protection and the RCS-901G high frequency directional protection,are equipped in the Qing-Ge line.In July 22,2018,the RCS-901G protection did not act when a single-phase grounding fault occurred.In-situ test and analysis show that when the grounding fault occurred,the station side of the RCS-901G protection was the low voltage side as the unit was not running.The protection activation element cannot act because the fault current collected by the protection equipment is too small.Also,the protection element cannot be activated as the weak-infeed function did not act.

关 键 词：光纤纵联差动保护 高频保护 弱馈功能 弱馈保护 

分 类 号：TM7734[电气工程—电力系统及自动化]