A
A 9FA gas turbine generator recommended shutdown because of high vibration on the coupling and collector end bearings just after sync. and loading the turbine.
-Unit returned from CI inspection, offline water washed and dried well before startup.
-During startup from turning gear mode to FSNL the situation was normal all readings are perfect.
-Generator CB closed, preselected load activated and 30 MW targeted.
-Seismic and proximeter vib. sensors on the generator started to read increasing values corresponding to MW.
-Reaching 150 MW seismic on the collector end (BB8) reads 7.5 mm/s and (BB9) reads 15.75 mm/s and proximeter on 91Y and 101Y reads 0.28 exceeding the high limit (0.25) and alarm generated on the HMI.
-All reading are normal except those vib. sensors increased only after loading the CTG and not before.
-All vib. sensors are checked and calibrated and bad sensors replaced before this startup.
-we shutdown the unit before it trips.
if anyone has an explanation for this situation please explain it with us.
thanks for reading
A.Sayed
-Unit returned from CI inspection, offline water washed and dried well before startup.
-During startup from turning gear mode to FSNL the situation was normal all readings are perfect.
-Generator CB closed, preselected load activated and 30 MW targeted.
-Seismic and proximeter vib. sensors on the generator started to read increasing values corresponding to MW.
-Reaching 150 MW seismic on the collector end (BB8) reads 7.5 mm/s and (BB9) reads 15.75 mm/s and proximeter on 91Y and 101Y reads 0.28 exceeding the high limit (0.25) and alarm generated on the HMI.
-All reading are normal except those vib. sensors increased only after loading the CTG and not before.
-All vib. sensors are checked and calibrated and bad sensors replaced before this startup.
-we shutdown the unit before it trips.
if anyone has an explanation for this situation please explain it with us.
thanks for reading
A.Sayed