一起330 MW汽轮机组异常跳闸原因分析及ETS系统改进

摘要

Through the analysis on the abnormal trip process of a 330-MW turbine unit,the principle of the logic protection card (LPC) based emergency trip system (ETS) system is clarified,and the design defect of the inconsistency between the protection and the first-out is identified.In the absence of SOE records,through the first-out illusion,the data in trip process are analyzed.Combined with a series of EH oil system investigation and comparison test,the real reason of the ETS system action is explained reasonably.Meanwhile,detailed measures to improve the reliability of the ETS system are proposed from the aspects of design principles,protection failure prevention and important measurement improvement.%通过一起330 MW汽轮机组异常跳闸过程分析,阐明基于汽轮机逻辑保护卡(LPC卡)实现的危急遮断系统(ETS)原理,发现其存在保护与首出不一致的设计隐患.在无事件顺序记录(SOE)状况下,透过首出假象,分析跳闸过程数据,结合一系列EH油系统排查、比对试验,合理解释了ETS系统动作的真实原因,同时从设计原则、防止拒动、完善重要测点等方面,提出了改进ETS系统可靠性的具体措施.