发电机逆功率导致汽轮机跳闸的原因分析及处理

Analysis on reasons of steam turbine trip caused by generator reverse power and treatment

某发电厂机组汽轮机数字电液控制系统发电机并网信号消失,汽轮机数字电液控制系统目标值无法正常设定,在转速控制方式下逐渐关小汽轮机调速汽门,导致发电机逆功率保护动作,造成了机组与系统解列的事故。通过分析此次停机的原因,提出了避免发生类似事故的措施。

In the unit of a power plant,the grid connecting signal of DEH system for the generator had disappeared.The target value of the DEH system could not set normally.Under the speed control mode,the opening of the turbine speed governing valve had been decreased gradually;and this had caused the generator reverse power protection to trip,and a splitting accident of the generator from the system had occurred.The reasons of this outage accident were analyzed,and the measures for prevention of similar accidents were put forward.