Search results

Farhan, No; 309EGuy is not confusing this coupling jacking with jacking oil (bearing lift oil); he realizes the two are very distinct things. He's just curious why it was necessary to use a jack on the coupling to help the turbine break away from zero speed--and why the torque from the...

Simon, Great philosophical question, and I'm going to try to answer each of your points. > 1.Price: Servicing turbine equipment is a lot like car maintenance. If your car’s repairs are covered under a > warranty, you let the dealer do the work. But if you’re not on a warranty, it doesn’t...

Neo, I believe L14HT will be a logic "1" when the shaft speed is above 8.4% speed (5100 * 0.084 = 428 RPM), and it will be a logic "0" when the shaft speed is below 3.2% speed (5100 * 0.032 = 163 RPM). [These numbers are approximate since I don't know what the Load Gear Box rating is, but...

Bhavin/BJM, If you're certain that the boiler can supply sufficient steam to maintain the isolated load, then do you know if the control system switches to Isochronous speed control mode automatically when the grid tie breaker opens? That would explain why the speed is dropping (frequency...

Dear MJ, The <b>PRIMARY</b> difference between the two HMIs is that the Mark VIe ToolboxST files that are used for configuration and troubleshooting are stored on CRM1_SVR, and are (or usually are) accessed by ToolboxST when it's opened on GT1_SVR. That's the <b>PRIMARY</b> difference between...

Ah, the seldom-used and little-known practice of load shading. You'll probably have better luck searching for "load shedding." And using double quotation marks ("load shedding"). There should be good World Wide Web references on that search term, or maybe "load shedding scheme." Hope...

Erwin, 1) Yes. Load is equivalent to fuel flow-rate (for internal combustion engines; steam for steam engines; wind for wind turbines; water for hydro turbines; etc.). More energy flowing into a prime mover (turbine, engine) driving a synchronous generator means more load that can be supplied...

Neo, Whoa! What about L14HT at your site?!?!?! How is L14HT used at your site? What are the values of TNK14HT1 and TNK14HT2?

Neo, Is the unit experiencing problems during start-up? High exhaust temperatures? High exhaust temperature spreads? Slow acceleration? Loss of flame trips? I believe we are dealing with a GE-design Frame 6B heavy duty gas turbine, with an electric motor starter and a "fixed" torque...

Steve Roche, Great news! Thanks for the feedback!

CuriousOne, Effectively--except it doesn't allow for changing the load setpoint very easily. Detuning is really not an option for allowing load sharing, but I've seen it done with reasonable results on a couple of occasions--but the system frequency wasn't very stable. Not very stable and...

Neo, I think it's best to think of it in this way: When the unit is not on speed control (specifically, droop speed control) at or near rated speed during starting (so when it's accelerating after firing and warm-up) that FSR is driven by FSRACC--until the unit reaches rated speed, at which...

Erwin, It is possible to synchronize two or more generator-sets in isochronous mode without load sharing <i><b>if the governors are detuned to allow simultaneous operation.</b></i> HOWEVER, when this is done the frequency is not stable and it's very difficult to control which generator-set...

TexasPower, I know there are formulas for determining residual magnetism of a rotating magnetic field but I can't tell you where to find them--except in some text or reference book. I suppose if one knew the residual magnetism one could use the generator V-curves to estimate terminal voltage...

Ali, Mark VI systems are no longer provided by GE; Mark VIe systems are now the standard. This means that the turbine control systems at your site have been in service for some time, and it would seem this problem has just recently started (or that it has not persisted since commissioning--we...

> thanks a million..nice contribution.. Happy you were satisfied! Wish we understood why two others weren't....

One more answer: You did not say how much you say this MV auxiliary bus-bar voltage change. 10V? 100V 1000V? What was the pf of the generator at the time of this incident? What was the reactive current value (MVars)? What was the load (MW)? Some sites are more able to have an effect on...

Neo, It would probably be better if you asked off-topic questions like this in new, separate threads. And, we are kind of getting off-topic with the discussion in this thread already (When will 88CR start?), and that's kind of the issue with the L4 threads--they got really off-track...

Sadiq, If I understand the question correctly, the efficiency of the gas turbine will not have an effect on the performance of the refrigeration cycle--except that if the gas turbine heat rate decreases (dirty axial compressor; dirty inlet air filters; degraded hot gas path components) it...

Daneezy, First of all, there are many "flavours" of DLN--and while some of them are very different they all share a common feature versus most conventional combustors (diffusion flame combustors): multiple fuel nozzles. One of the most important contributors to the formation of NOx is the...