【摘要】 介绍了2起220MW汽轮机挂闸电磁阀卡涩所造成的故障。提出了判断挂闸电磁阀卡涩的征象:(1)高限卡涩时危急遮断器大滑阀上的警报油压保持工作值,挂闸电磁阀能够带电,但无法实现挂闸,手动顶压电磁阀铁芯无位移,机头打闸时危急遮断器大滑阀下的附加保安油压也相应发生变化;(2)低位卡涩时危急遮断器大滑阀上的警戒油压过低甚至为零,手动顶压电磁阀铁芯无位移,运行机组就地无法打闸跳机。分析了挂闸电磁阀卡涩对机组运行的影响,并提出了防范挂闸电磁阀卡涩的措施。更多还原

【Abstract】 Presented in this paper are two operation failures caused by the sticking of electromagnetic valves in a steam turbine unit with a capacity of 220MW.Analysis was made to the impact of valve sticking on safe operation of the turbine unit.And some solutions were put forward to prevent such failures.更多还原