挂闸电磁阀卡涩对220MW汽轮机组运行安全影响的分析和防范措施

ANALYSIS AND SOLUTIONS AGAINST THE IMPACT OF ELECTROMAGNETIC VALVE STICKING ON OPERATION OF 220 MW STEAM TURBINE UNIT

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。

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