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Saul, Why do you think steam blows are performed on a steam turbine-generator plant?

Aptx4869, Explain how the unit transitions from Simple Cycle to Combined Cycle modes. Does it have an exhaust bypass stack, with a damper or diverter that has to change position to re-direct the exhaust flow from the bypass stack to the HRSG? Is this happening before or after you are changing...

Thanks VERY MUCH for the feedback! It's great to see that a six year-old thread can be helpful!!!

gilariver Jack, So, I think I may understand the problem--I apologize for not spotting it sooner. In your original post you said you put BJ1, BJ2 & BJ3 IN--and that <b>is</b> for C_C_MAI15, C_C_MAI16 & C_C_MAI17. However, C_C_MAI15 is 'Signal 1' on the TCCB. The TCCB has 22 additional mA...

Aaristokrat, The least expensive type of flame detection system used in most gas turbines is done using an ultra-violet (UV) sensor. The sensor is charged to a high voltage (sometimes as high as 335 VDC) and when it sees flame the sensor shorts itself to produce a saw-tooth output (pulse...

skbarc, You must have load to load-test the gas turbine-generator set. The gas turbine provides torque to the generator which converts the torque to amperes--which must be "doing something", even if that's just generating heat in a load bank. The gas turbine can produce a LOT of torque--but...

Thanks VERY MUCH for the detailed feedback! It's so important for others who read these threads now--and in the future--to know what was done and how the problem was ultimately resolved. I believe there are several companies, including some divisions of GE, that are using...

transporter84, My best guess is L43FL_PRSET, because that logic signal, when it goes to a logic "1", causes the Fuel Selection Command State block to select liquid fuel and initiates the transfer to liquid fuel. It takes precedence over the other enabled PRSET inputs, because of the order of...

It should be on the "back" of the vertical inlet duct, just above the Turbine Compartment roof. Or, it could be on either side of the vertical inlet duct just above the slanted portion that narrows down to the bellmohuth (the axial compressor inlet). Or it could be on the vertical inlet...

I'm sorry for the delay in responding. I was recently shamed when I tried to explain how some function worked on a unit which was built and configured by GE in Belfort, France, and learned they have completely changed how that particular worked--after decades (literally) of no problems...

I want to add one more clarification. On a working three-coil servo-valve if the polarity of current being applied to one coil is wrong then the valve will still move and allow flow (of fuel or air). The error between the reference and the indicated (actual) will be a little larger, and the...

NOx is a product of the combustion of hydrocarbon-based fuels. NOx is an atmospheric pollutant. > why is it important to eliminate to the barest minimum NOx > in a gas turbine? To reduce air pollution. For a really good discussion of NOx and its effects on the air we breathe and the rain...

Thanks for the feedback! I'm a terrible proof-reader of my own writing, and there are a couple/three errors in my writing which I hope didn't cause a great deal of confusion. Servo current polarity and "smoothness" of travel are NOT related. The device will move if a single coil is receiving...

gilariver Jack, A "standard" Mark V did not include the TCCB--but when it was available as an option. I presume you are configuring the input from the <C> (or <B>) TCCB target (button) of the I/O Configurator. Are there other I/O connected to that card that are working? (Sorry; I haven't...

skbarc, Thanks for the feedback! "Feedback is the most important contribution!"(c) here at control.com. I am happy to have been of help.

fudge, From the notes in the photos you sent, it appears the code (which is a different version of "primary frequency response" than I've seen before--so, that makes it three known versions of PFR (Primary Frequency Response) that exist that I know of) will work when Pre-Selected Load Control...

Jack, I suspect everything is working correctly--BUT, the DIAGC.DAT file does not match the card/PROM revisions for the Mark V which is why it's not working on the DIAGC display. Have you tried the Demand Display? Have you run MK5MAKE.BAT and then re-booted the HMI (or, restarted TCI)...

Ilechie Chiedozie, Everyone detests the answer, but that doesn't make it any less correct: It's different for every site--because of factors like elevation, type of inlet air filter, ambient contaminants (dust from nearby dirt roads (if any), dust from nearby industrial plants such as cement...

BCD, Are the generators connected to the same bus? Does each generator have its own step-up transformer before the common bus? When did the problem start? After some planned (or unplanned) outage? After a lightning strike? Is the grid frequency stable when these problems are occurring...

skbarc, >Great! So I understand that considering running DG of 1MVA >as a FIXED REFERENCE and trying to regulate V & f of a BIG >10 MVA GTG to synchronize it with DG, is not really a matter >of concern as far as I do not put both of these generators >in Isoch mode simultaneously. Is my...