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Hi every one,
After greeting we have 3 units GEframe9FA in ower plant GT1,2,3. GT1 and GT2 always tripping by protection loss of flame at bas load.
i analyze the trends and trip logs for both units i found every thing ok for PM4,PM1and SRV all reference and feed back values for all gas control valves are ok up to the time of trip all the flame scanners suddenly give low intensity and unit tripped. i checked also in trip log all servo currents are ok. we try to clean Hydraulic filters for control v/vs an and also clean the trip relay for SRV and start the units it is synchronize. but after some times it is tripped again by same reason. next time i changed four flame scanners but again tripped by same reason. can any one help me what is the reason of this loss of flame? and i also regarded during startup one alarm came "Turbine can't accelerate at part speed". this come from firing speed up to 1600 rpm and unit shutdown due to this alarm. i bypass this alarm up to synch speed. any one can tell me what is the reason of this alarm?
Thanks every one,
After greeting we have 3 units GEframe9FA in ower plant GT1,2,3. GT1 and GT2 always tripping by protection loss of flame at bas load.
i analyze the trends and trip logs for both units i found every thing ok for PM4,PM1and SRV all reference and feed back values for all gas control valves are ok up to the time of trip all the flame scanners suddenly give low intensity and unit tripped. i checked also in trip log all servo currents are ok. we try to clean Hydraulic filters for control v/vs an and also clean the trip relay for SRV and start the units it is synchronize. but after some times it is tripped again by same reason. next time i changed four flame scanners but again tripped by same reason. can any one help me what is the reason of this loss of flame? and i also regarded during startup one alarm came "Turbine can't accelerate at part speed". this come from firing speed up to 1600 rpm and unit shutdown due to this alarm. i bypass this alarm up to synch speed. any one can tell me what is the reason of this alarm?
Thanks every one,