桥巩水电站发电机三次谐波3W定子保护及改造

Third harmonic 3W generator stator earthing protection of Qiaogong Hydropower Station

针对桥巩水电站三次谐波3W定子接地保护在机组空载状态下无法实现保护功能的问题,提出了通过在保护回路的接线中增加发电机出口开关的位置接点,使接地保护更加准确、可靠。

Qiaogong Hydropower Station had ever seen the third harmonic 3W generator stator earthing protection fails to work under no-load condition. In view of this problem, additional position contacts of generator terminal switchgear are designed in the protection circuit, so as to acquire more correct and reliable protection.