ProcessBook Trend of turbine speed showed hunting (oscillation) where non occurred.

Discussion created by sachin7779 on Sep 27, 2012
Latest reply on Oct 1, 2012 by mariamp
Recently got a PI trend of turbine speed at one of the sites. This is coasting down of the turbine and in actual, there was no hunting in the process or speed.


Site said that this was due to power failure of the interface PC, but it still it is not understood why hunting in PI trend occured. DCS trend of the same parameter was not having any hunting.

Can anyone suggest what could be the reason?