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Henry, Flattery will get you almost anywhere with some people. This is a subject that is near and dear to my heart, but I won't take it on over the Internet in a forum like this. I think many people could benefit from the exercise, but there are just too many intangibles and too many...

Chandru, The speed of the prime mover driving a synchronous generator is locked into what's called "synchronous speed"--the speed that is proportional to the frequency of the AC in the generator stator windings. If the torque being provided to the generator rotor is exactly equal to the...

Exactly what one would expect to see. The overspeed detected by <Z> drops out the ETRs, and the LEDs indicate a mismatch with <X> and <Y>--which is just what the Diagnostic Alarms indicated. Any time you see LEDs blinking out of synchronism with others of the same type, that indicates the...

It would be necessary to have quite a bit more information than you have provided, and this kind of project should really be done by a professional who has access to some detailed information about your plant and how the AFC works and/or can be made to work. The short answer is: It's probably...

Desi, <b>When did this problem start?</b> Other threads have mentioned that these kinds of problems usually occur when Pre-Vote Data Displays or Logic Forcing Displays are left open for long periods of time. Is that happening on this machine? <b>Do you use <I>s or GE Mark V HMIs?</b>...

Veenak, Thanks for the feedback!

Desi, We're really glad you found this site. It has a very good 'Search' feature; the search term entry field is located at the far right of the Menu bar at the top of every control.com page. Try using the Search term: "QST DPM" with the double quotation marks enveloping the...

Chandru, Try this link: http://services.eng.uts.edu.au/cempe/subjects_JGZ/eet/eet_ch6.pdf (Remove any spaces inserted by the forum software.) There is NO difference between an electric machine used as a motor or one used as a generator--except the "direction" of torque and current...

sardar9, The topic of the CPD-biased exhaust temperature control slope has been covered many many times on control.com, some with "drawings". Use the 'Search' feature at the far right side of the Menu bar at the top of every control.com page. The thing to remember when looking at the...

To expand on Roy's answer, many field devices called "calibrators" have the ability to "source" or "simulate" 4-20 mA signals. These calibrators are usually very similar to many multi-function digital voltmeters. If one of these calibrators is put into "source" mode, it will provide the 24 VDC...

LTW, What have you done to try to troubleshoot the problem? What were the results of your efforts? The Combustion Trouble alarm is telling you that a higher-than-allowable exhaust temperature spread (one of several different conditions) exists. Unfortunately, it only gives cognizant...

RP, Thanks for the feedback!

Daniel Chamorro, You are most welcome for any help I may have provided. I congratulate you for being pro-active in your understanding of basic power plant fundamentals. Best of luck! We're always here if you have more questions. We don't always have all the answers, but we have a lot of them.

The reason the ETRn (Emergency Trip Relay) voting mismatch Diag. Alarms are being annunciated is because <T> has detected an HP (turbine shaft speed) over-speed--L12H_P. You can use Pre-Vote Data Display to view TNH_OS to see if the speed signal input to <T> is stable or is low or...

sardar9, This is just to clarify your post. For units with conventional combustors (such as yours) and the ability to select IGV Exhaust Temperature Control (sometimes simply called IGV Temperature Control) ON and OFF, when it's selected OFF and the unit is loaded from initial breaker...

pawan, When do <b>you</b> believe it should be possible to enable Temperature Matching? Before generator breaker closure? The typical value of TNR when synchronization is started is 100.3%, and that's so that there is a positive watts flow when the generator breaker is closed. For a...

Daniel Chamorro, The Isochronous Speed Control mode of the governor of the turbine control system(s) at your plant will do the necessary adjustment of fuel or steam flows to the turbine to make sure that frequency remains at rated when operating in Island mode. No PMS or Load Shedding...

Daniel Chamorro, Don't be offended for not understanding someone's explanation--especially mine. And, your English is fine. If I seem frustrated, it's because we have this running battle here on control.com about whether or not AC generators (alternators) run at different speeds after...

OOPS!!! >--Reactive power is a function of the >excitation being applied to the prime >mover of the generator. <pre><b>***!!!NOT!!!***</b></pre> Excitation is <b>NOT</b> applied to a generator prime mover (I need to be more careful with 'Copy and Paste'!). Excitation is applied to the...

Daniel, You might want to check out this thread: http://www.control.com/thread/1348990642 It's kind of related.... Also, sometimes the software control.com uses inserts unintended spaces in URLs, so remove any spaces if it does.... Also, use the 'Search' feature of control.com; a...