Problem of the turbine speed dropping to zero and then rising again after tripping
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Why does the turbine in the unit trip, its speed drop to zero, then rise slightly before dropping back to zero again?
The specific details on site weren’t explained in detail; could it be that the machine started rotating briefly when steam was released to relieve pressure after it stopped, and then stopped again once the pressure was relieved?
There is a high possibility of reversal; check the check valves in the process piping