水轮机115%额定转速过速保护误动解决方案

Solution for Over-speed Protection Misoperation Under 115% Rated Speed in Hydraulic Generator

详细介绍了水电机组采用115%额定转速(nr)过速信号加主配压阀位置接点判断115%nr过速保护容易产生误动的原因。阐述了传统常规的主配压阀拒动的处理方式,讨论了机组115%nr过速保护控制解决方案,同时提出了一种新的115%nr过速保护逻辑控制策略:在115%nr上升沿期间加主配压阀拒动信号来启动115%nr过速保护,并指出了该方案的特点。

The over-speed protection misoperation under 115% rated speed in hydraulic turbine generator is introduced.The reason for the above problem is analyzed.Traditional tripping approach about the main pressure valve is described.The unit over-speed protection control solutions under 115% rated speed are discussed.Meanwhile,a new kind of over-speed protection logic control strategy is put forward： using the rising edge of 115% rated speed with valves position to judge the mis operation of speed governor＇s main control valve.At present,the method has been applied in the Shanxi Power Plant with good results.And the disoperation of the protection and optimization of the system structure has been solved.