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Jolek, I want to add information about the ignitors being unable to ignite flame in the Primary combustion zone during a Premix-to-Lean-Lean combustion mode transfer. The high-energy ignitors do not work indefinitely; they will eventually need to be replaced, and when they are replaced the new...

Jolek, I understand "...All trips come from the latest...." to mean that all the trips which are occurring when the unit is being unloaded and during the Premix Steady-State to Lean-Lean combustion mode transfer are the direct result of the logic added to the Mark V associated with the...

I agree with waltrobinson's suggestion that the turbine- and/or generator shaft may not be coupled to the Accessory Gear Box output shaft. EITHER the hydraulic ratchet pump output pressure and flow-rate are really high or there isn't much inertia being turned. Or, as was suggested, the L.O...

The sensors are measuring the relative humidity of the air entering the axial compressor--not just the ambient humidity. If the evaporative coolers are increasing the humidity of the air entering the axial compressor, placing the relative humidity sensor in front of the evaporative coolers will...

Thank you for the feedback!

No matter the method used, the data has to be verifiable. I may be painfully treatisizing the importance of gathering verifiable data, but it's still important--nay, critical--nonetheless. Here's a good resource I found: http://www.chacanada.com/chacanada/assets/File/GTPerf_0900.pdf Here's...

H.J Kim, I think I kind of mis-spoke about IGV operation in DLN-I part load operation. The IGVs aren't really used to maximize exhaust temperature--they are held closed to minimize the air flow into/through the unit at part load, which in turn maximizes the exhaust temperature (up to the...

Thanks for the video; it's very helpful. In the video, the right half of the jaw clutch is the one that moves (slides back and forth)--so it is the half that is driven by the starting means and the hydraulic ratchet. I don't see the starting means side retracting; what I see is after the...

MRabby, Again, no response to the question of how the brush temperatures are being measured.... Specifically, has the site been tracking brush temperatures for any period of time, other than just since the recent outage, or just before the recent outage. The generator OEM is the best resource...

dsj, Okay; while this doesn't seem to be a complete list of Diagnostic Alarms--it is a start. Based on the partial page of Diagnostic Alarms provided, it looks like <S> processor believes the unit should be tripped, and so it's only the two-out-of-three hardware voting relays (physical...

gowther, Actually, the in/out directions of compartment ventilation air have changed multiple times over the time GE has been designing heavy duty gas turbines--for many reasons. The Load Compartment is a hot place to begin with, and so it is felt it is best to pressurize it with outside air...

MRabby, You conspicuously did NOT tell us what troubleshooting has been done at site regarding this "problem" and what the results of the troubleshooting were. There are usually RTDs (Resistance Temperature Devices) mounted in the collector housing, monitoring the temperature of the air...

Is the unit reaching rated speed and producing power? Is it taking too long to reach rated speed and produce power? Or, is it taking less time than usual to reach rated speed and produce power? When did this problem start? After a maintenance outage? What is the hydraulic supply pressure doing...

---CONTINUATION--- After that, if it is determined the performance is less than it should be and less than acceptable, then a group of people need to decide how to proceed. This means someone--a group or committee, likely--has to sit down and discuss how to proceed. If it's decided that some...

Lusco, You are in a very difficult predicament; you are a graduate engineer, so you are expected to have many, if not all of the, answers and methods to solve just about any problem. BUT, you (probably) have little practical experience (which is difficult to obtain in university for a field...

MRabby, The brushes "transmit" (conduct) the current--supplied by the excitation system (the "AVR")--to the generator rotor windings by their contact with the slip rings. If the current is unstable, then it's likely the output of the excitation system is unstable. More current means more...

There is black start and there is dead-bus breaker closure. Often the two are necessary to re-energize some line or portion of the grid, but one can be used without the other. I would ask if there is some difference in the dead-bus breaker closure logic that is responsible for this difference...

There are mechanical field engineers, and there are controls field engineers. Which are you? And, this is primarily a controls-related site. The control systems include mechanical devices, and operate mechanical devices. When appropriate, we answer mechanically-related questions, but we don't...

One more thing. I do not respond to PMs or DMs (Private Messages, or Direct Messages). I feel, and believe, very strongly that the biggest benefit of forums like this one, and in particular this one, is that MANY people can be helped with the response(s) to a single question because many people...

Rajesh Elangovan, We are glad you found control.com. We try to keep new questions in new threads; this latest question really doesn't have anything to do with the subject of this thread where you have posted the question (and your previous one). Please open a new thread (not difficult; but not...