零功率切机保护在大型火电厂的应用

叙述了零功率切机保护的应用情况,作为最近发展的发电机保护新品种,在当前新建大型火力发电厂汽轮发电机组保护中得到了广泛的应用,它的作用是当电厂送出线路全部事故跳闸或开关同时偷跳,或者发变组出口断路器偷跳,使机组的有功突甩至0时,立即动作将汽轮发电机组跳闸,其设置的目的是防止汽轮机超速及安全停机。

Application of Zero-power Tripping Protection for Large Thermal Power Plant

Zero-power tripping protection is widely used in the newly built large-scale thermal-power plant as a new latest developing means of generator protection.Its main function is to trip the steam turbine if all the line breaks opened when protection works or malfunction,or the main transformer break opened because of malfunction,so as that the load of the generator drop to zero suddenly. Its purpose is to avoid the steam turbine over speed and to shut down safely.