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student, >Where speed sensors mounted to measure speed of gas turbine >and steam turbine? Why? Turbine manufacturers locate them in different places for different reasons. Most commonly, the speed sensors are mounted "above" a toothed wheel (made by machining either the shaft or a "disc"...

niazbibiyana, People will start talking (as people will do) if you keep using 'Dear' also. My colleagues call me CSA. (That's one of the nicer things they call me.)

Rezaq, Every synchronous generator is supplied with what's commonly referred to as its Reactive Capability Curve, or its Capability Cureve. This diagram, which is pretty much unique for every machine, depicts VArs on one axis and Watts on the axis, and shows the limits of the ability of the...

niazbibiyana, Thanks for the feedback! (And, please stop calling me 'Sir.' I work for a living just like most everyone else on this forum.)

niazbibiyana, Thanks for the information on the limit switches. And, without being able to see the application code running in the Mark VIe of the turbine at your site it's impossible for us to say exactly how the unit at your site is controlled and protected. I will say that if the Mark...

niazbibiyana, Differential pressure transducers (transmitters) are frequently used as part of flow-monitoring equipment (by measuring differential pressure across an orifice (or orifices, in the case of fuel nozzles). Without purge air flowing in the gas fuel manifolds/nozzles when there...

grajesh, This question is related to the performance of heavy duty gas turbines--a topic which has been covered MANY times before on control.com (and we know you're a very constant reader of most of the heavy duty gas turbine-related posts on control.com). Machine conditions (internal...

josephpc91, There's probably a passable description of most of these in the operations & service manuals provided with the unit. Do you have access to the operations & service manuals provided with the unit? If you have experience with other GE-design heavy duty gas turbines then some of...

niazbibiyana, Thanks for the feedback; glad to be of help. But, as you can read, you still have a lot of work to do at site to fully understand how things work at your site. And, it would be most helpful if you could tell us what version (Mark V; Mark VI; Mark Ve) of Speedtronic turbine...

niazbibiyana, It would also be helpful to know what each of the four limit switches on VA13-2 do (in other words, what position they are to indicate)? Perhaps the sequencing/application code in the Speedtronic turbine control panel adjusts the milliamp output to 65GP-E1P to make the valve...

niazbibiyana, > But, kindly inform me in D5 purge line the last valve "VA13-2" > has some control function to control the opening percentage > of that VA13-2 valve? but in PM4 purge line, the last valve > "VA13-6" does not have this type of control. Do you know, > why? if you know, please...

niazbibiyana and Vincent05, A lot of the answers to these questions can be obtained by going out to the areas where the devices are located and following tubing/piping lines and, in some cases, applying what one finds to what one knows about hazardous areas and enclosures, AND referring to...

There have been several statements made in this thread, that, while not entirely correct, are confusing and do not apply to all gas turbines--particularly all GE-design heavy duty gas turbines. For every action there is an equal and opposite reaction--that much we can all agree on, right...

This isn't a number that GE generally shares, or publishes. I have seen some generator rotor inertia values shown on generator data sheets, but I've not seen the turbine (and axial compressor) rotor inertia values on any documentation. Many years a gentleman by the name of William (Bill)...

hasith, control.com has a very fast 'Help' feature cleverly hidden at the far right of the Menu bar at the top of every desktop webpage. The syntax isn't like most Internet search engines; use the Search 'Help' for details. Using "pkzip" in the control.com Search box (with the double...

Boosterkitty, Thank YOU for taking the time to answer all of the questions; that's quite a rarity and it's much appreciated. Okay; so the vectormeter is some kind of dynamic reactive capability curve that helps operators not to exceed the rating of the machine. I presume (hope) that there...

boosterkitty, What is the manufacturer/model number of your exciter regulator (AVR)? What's a vectormeter? (Power factor meter? VAr meter? Dynamic reactive capability curve on an HMI display?) What kind of prime mover is driving the generator (steam turbine; gas turbine; hydro turbine...

CuriousOne, Typically the over- and under-frequency relays are set to actuate before the Droop limits are reached. And, using 4%, the Droop limit as a function of frequency (at 50 Hz) would be +/- 2.0 Hz. But that's not always the case. But, Droop speed control is about how much the...

>SRPO9002, After all the proofreading there was still a mistake in the second sentence of the third paragraph; it should have read: Frequency increases on a system (large or small) when the load on the system *IS LESS THAN* the amount of generation currently on the system.

SRPO9002, Sorry; after re-reading this thread several times, I'm still not able to understand. When frequency INCREASES Droop speed control acts to lower the load of the unit it is active on by closing the control valve. I believe you said when the frequency INCREASES the action of the...