发电机脱网汽轮机打闸而厂用电未及时切换事故研究

Study on the Accident of Generator off Grid and Turbine Tripping Without Timely Switching of Auxiliary Power

通过分析某电厂一起安控切机后,发电机脱网、汽轮机跳闸而厂用电快切装置未及时切换,造成6 kV厂用电压严重降低且持续时间长的事故,提出改进措施,以确保机组安全稳定停运,进而分析事故原因并提出预防措施。

China’s power industry is in a period of rapid development.Various high-voltage electrical equipment can be seen in many different fields,which shows its wide range of application in China.By analyzing that after a safety control shutdown in a power plant,the generator was disconnected and the steam turbine tripped,while the auxiliary power fast switching device was not switched in time,resulting in a serious reduction of 6 kV auxiliary voltage and long duration,this paper puts forward improvement measures to ensure the safe and stable shutdown of the unit,and then analyzes the causes of the accident and future preventive measures.