I'm facing high spread temperature trip in HITACHI H-25 gas turbine at startup (3000-3500 rmp).
All conditions seems normal such as T/Cs and GCVs. There was a fluctuation in spread at 10 MW load. We've checked all nozzles and calibrated all GCVs. But after firing there is abnormal increase in FFD, and finally it trips in around 3000 rmp in acceleration mode.
I'll appreciate it if anyone could help.
This is a VERY frequently asked question on control.com.
Try this thread, and the one mentioned in the response:
I'm not familiar with the mnemonic FFD. Can you explain it, please?