Gas Turbine hunting MS 5001

D

Thread Starter

Djafer

Hello CSA,

We have two gas turbine (Frame-5, 25MW) MARK V HMI at our plant TG-3 (ISO mode) and TG-2 (Droop Mode). From last days when a particular motors (06 Mwatts) at our plant starts TG-3 pick 06 MW. But the frequency was hunting between (48 to 50 Hz).

We have changed mode of TG1 in ishoo and TG3 in Droop, the frequency became stable (50Hz).

Please help me
 
It is pretty clear that there is some problem with the governor/fuel control on the Iso machine that is hunting. Again, we really need more information on the machine, maintenance history, type of fuel, etc. If you can, please also send details when the machine is hunting, FSR, Load, Servo currents, etc.

If you need a quick fix and can get the machine offline, it would be worth preparing to change the fuel servovalve(s).
 
Thank you for your answer.

Please find bellow the reponses of your questions:

- Maintenance History: We have changed TCEA and TCTG cards.

- Type of fuel: Gas

- FSR : 36.67 to 37.04

- DWATT: 13.5 to 14.4

- FARG: -1.39 to -0.86

-FAG: -0.65 to -1.40

Regards
 
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