一起汽轮发电机定子100%接地报警的分析与处理

Analysis and Treatment of a Turbogenerator Stator 100%Grounding Alarm

某发电企业一台300 MW汽轮发电机的三次谐波定子接地保护动作报警,通过分析比较发变组保护A、B柜及故障录波装置相关数据,发现并纠正了电压回路的不正确接线,排除了该发电机发生定子单相接地的可能性,避免了一次非计划停运,实现了发变组保护A、B柜电压回路的独立。

The third harmonic stator ground protection action alarm of a 300 MW steam turbine generator in a power generation enterprise is given.By analyzing and comparing the data of generator transformer unit protection A and B cabinets and fault recorder,the possibility of single-phase stator grounding of the generator is eliminated,and an unplanned outage is avoided.During the inspection,the incorrect wiring of voltage circuit is found and corrected,and the voltage of generator transformer unit protection cabinet A and B is realized The loop is independent.