LFP-901保护在电厂正常并网时误动的分析  

Analysis of LFP-901 Protection Malfunction in Normal Integration of Power Plant into Grid

作　　者：肖平[1] 

机构地区：[1]宜宾电业局,四川宜宾644002

出　　处：《华北电力技术》2012年第3期52-56,共5页North China Electric Power

摘　　要：220 kV线路保护拒动和误动对区域电网影响都很大。本例从保护原理、二次回路、高频通道等方面,深入分析了一220 kV线路按南瑞继保LFP-901、902双重化配置的两侧开关保护,在电厂侧开关同期并网时,仅主网侧的LFP-901误动,而两侧其他三套保护均未动作的原因,阐明在闭锁式高频保护中,高频通道、远方起信回路、TWJ开入对保护正确动作所起的重要作用。220 kV transmission line protection＇s non-action and malfunction have a great impact on the regional grid. In this case, starting from the protection principle, the secondary circuit and high-frequency channels, etc. , it analyzed the cause that a 220 kV transmission line with NR relay protection LFP-901,902, the double configuration switch protection on both sides,when the breaker on power plant incorporates in same time into grid,only LFP-901 on the main grid side malfunctioned, while other 3 sets of protection on both side were not acting. It expounded in the latch-type high-frequency protection,the high-frequency channel,the signal circuit started by remote device and TWJ open into the protection played an important role for the correct action of protection.

关 键 词：高频保护 闭锁式 高频通道 工频变化量 收发信 TWJ 

分 类 号：TM774[电气工程—电力系统及自动化]