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otised, Thanks for the information! I don't believe GE will provide the DUAL Redundant configuration on a DLN-equipped heavy duty gas turbine, and I don't know if they will provide it on an aero-derivative gas turbine, particularly one with DLE. But I do know they provide it on steam...

Isulamu, Good question, and, again--there's not much written on the subject by GE.... Hopefully Demigrog will correct me where I'm wrong, and fill in the blanks I may create. It's my understanding that DUAL redundant Mark VIe systems are somewhat "unusual" when it comes to control in that...

Rotimi88, There's a couple more things which might help with your understanding. First, synchronization. It's a BIG deal!!! By, that I mean, the process is very critical and very important, and it involves getting the magnetic poles basically in line with each other (for all three...

waltrobinson, You/The site seem to be discounting the possibility that the problem could be related to wiring and grounding. If you would fully describe the new signal which was added to the TCCB card, where the signal was terminated in the Mark V, how it is powered (by the Mark V or by some...

Rotimi88, Essentially the people you have been talking to are correct. Once one synchronous generator and its prime mover are providing power to the plant when a second one is synchronized to it they will both operate at the same frequency. That word--synchronized--is a very powerful word...

joe45678, Thank you very much for the feedback--and good on you for following through on this with the servo- and turbine manufacturers. It would be great if you would share with us the turbine manufacturer and the model of turbine, as well as the servo manufacturer. It seems both have...

The most common causes of flickering flame indications, and/or loss of flame trips during firing/warm-up/acceleration and/or failures to ignite when starting on gas fuel are: --changes in the caloric content of the gas fuel (new supply/field) --improperly calibrated gas fuel control valve...

joe45678, >I don't think we had any relevant diagnostic alarms >present. I will check on that. Diagnostic Alarms are not nuisances (some may be, but they can be resolved in every case), and can help point to an issue with a card or input/output "channel." People overlook and ignore...

joe45678, What Diagnostic Alarms are being annunciated by the Mark V? >Valve command when stroked/Position Feedback >-25/.43 >-5/.43 >-1/.8 >0/1.45 > >This is the same thing that we saw when attempting to start >up; only the valve command goes from -25 to 0. <i>Based on the...

briq, Thanks for the feedback!

Loopy, >I have some rotameters on site.... Would you tell us the manufacturer and model number of the rotameters?

In any synchronous generator (more correctly called an alternator) regardless of the type of prime mover (steam turbine, or gas turbine, or reciprocating engine, or hydro turbine, etc.) when excitation is increased more DC current/voltage is applied to the rotating field conductors, and when...

briq, Only GE could say with 100% certainty if the G4A could replace a G5A. I was only providing details about the process of replacing an SDCC card in the hope that something might help with your problem. The last thing I might suggest is to carefully ensure the ribbon cable that connects...

briq, Sometimes cards have slightly different hardware ("Berg") jumpers, but in general all the jumpers on the new card should match the positions on the old card (that is, put the jumpers on the new card in the same positions as you found them on the old card). Next, because the EEPROM on...

There is no other way to verify wheelspace temperatures on GE-design heavy duty gas turbines. When did the problem occur--after a maintenance outage? What were the wheelspace temperatures in the weeks prior to the trip? Were they High? Were they increasing? How fast were they increasing...

All of the functions of the <P> core are covered in the Mark V Applications Manual, GEH-6195. Yes, it does emergency overspeed (ALWAYS--even if the unit has a mechanical overspeed bolt, the emergency overspeed is ALWAYS functioning), flame detection, synchronization functions (it accepts the...

Rotimi88, There are multiple combustion cans and fuel nozzles on a GE-design heavy duty gas turbine. And, the same amount of liquid fuel must flow to each combustor's fuel nozzle. The liquid fuel flow divider does that--it separates the single stream of liquid fuel exiting the liquid fuel...

.csv files are '"Comma-Separated Value" files. Most spreadsheet applications/programs (such as MicroSoft Excel) can import .csv files. Once imported, they can then be graphed. .csv files are ASCII text files, with the data in columns separated by commas. And, line is a row--just like in...

SAK, >I have seen the responses of Droop machines. With the >disturbance in grid, the load on the machines >increases/decreases in milliseconds. I mean they take/give >up 10-15 MW in miliseconds (in our machines, obviously for >bigger machines and grids this would be even greater)...

Rotimi88, No; I meant full load (rated prime mover output--when the machine is in a new and clean condition, and ambient conditions are at machine rating, and the fuel is per specification) and the unit is synchronized to a stable grid operating. When TNR (for GE-design heavy duty gas...