I am an electrician in the Gas Turbine electrical station. Our station has Hitachi h25 gas turbine, and we have faced a problem with FFD of turbine.
When outside temperature does decrease, FFD indicator of turbine increases from 99 to 100 and our turbine goes to partial load from base load at 32 MW. Further decreasing of outside temperature our turbine doesn't gain load (power). if stopping turbine and running again turbine goes to base load, but after 10 or 20 days we have the same process. I mean turbine goes to partial load from base load.