Greetings
Our Gas turbine (7 Fa Dln2.6 Mark VI) trips on high exhaust temperature spread after selecting IGV Temp Matching (transferring from SC into CC).
After selecting Matching ON, spreads #1, 2, and 3 start increasing fast. After selecting Matching OFF, spread return to normal levels.
There are also some other alarms at the same time like:
1. Combustion Trouble
2. Correcting TNR Drift on IGV Temp Match
3. TNR outside IGV Temp Match range trip TM
This problem happened after changing the IBH Control valve due to mechanical issue (Stuck). After the change, I&C calibrated the feedback. Also I&C tuned the CTIM sensor.
We reported the issue to GE, and first they recommended I&C to calibrate IGV, SRV, Pm1, pm2, pm3, pm4.
This calibration didn't solve the problem. After that GE recommended to change some constant values (sorry I am not what they were).
All the constant values were changed according to GE recommendation but still the problem has not been resolved. Any idea please?
Our Gas turbine (7 Fa Dln2.6 Mark VI) trips on high exhaust temperature spread after selecting IGV Temp Matching (transferring from SC into CC).
After selecting Matching ON, spreads #1, 2, and 3 start increasing fast. After selecting Matching OFF, spread return to normal levels.
There are also some other alarms at the same time like:
1. Combustion Trouble
2. Correcting TNR Drift on IGV Temp Match
3. TNR outside IGV Temp Match range trip TM
This problem happened after changing the IBH Control valve due to mechanical issue (Stuck). After the change, I&C calibrated the feedback. Also I&C tuned the CTIM sensor.
We reported the issue to GE, and first they recommended I&C to calibrate IGV, SRV, Pm1, pm2, pm3, pm4.
This calibration didn't solve the problem. After that GE recommended to change some constant values (sorry I am not what they were).
All the constant values were changed according to GE recommendation but still the problem has not been resolved. Any idea please?