由一起发电机失磁事故谈失磁和逆功率保护的设置  

Discussion about loss-of-field and reverse-power protection configuration from the generator loss-of-field fault

作　　者：刘伟良[1] 陈宏[1] 刘宇[1] 张亮峰[1] 

机构地区：[1]湖南省电力公司试验研究院,湖南长沙410007

出　　处：《电力系统保护与控制》2009年第23期164-166,169,共4页Power System Protection and Control

摘　　要：分析了某发电厂一起发电机失磁事故保护不正确动作的原因是由于程序逆功率和失磁保护设置不当。对其中涉及到的几个方面的问题展开探讨,就程序逆功率和失磁保护的定值整定不合理问题提出建议,强调了失磁保护减出力出口的必要性,分析和校核了失磁保护的系统低电压的闭锁判据的灵敏度,提出了失磁保护合理的动作逻辑。The reason about generator loss-of-field fault is analyzed. The unreasonable settings of the programmed reverse-power and loss-of-field protection led to incorrect actions. Several aspects about the protections are discussed including the suitable methods of protection settings, emphasizing importance of the reducing power, and checking sensitivity of system voltage blocking. Thus a suitable method is proposed about action logic of loss-of-field protection.

关 键 词：失磁保护 逆功率保护 动作逻辑 整定 

分 类 号：TM31[电气工程—电机]