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Hi, Why is it necessary to change speed during loaded operation? Are you able to change turbine speed when 52G is closed and Pre-Select Load is not in operation? If the answer is yes, how do you change speed during loaded operation? How large is the grid (load) the unit is operating in...

Synchronization (manual or automatic) involves several things. Two of the most important are closing the breaker when the incoming and running sine waves are very closely "synchronized" and minimizing the voltage differential between the incoming and running sine waves. When the synchroscope...

I may have forgotten to include the link to the thread with the GE Controls Connect information: http://www.control.com/thread/1326644263#1326725980

I have to make an admission, also. I completely misread your post being about a liquid fuel splitter valve. That's a rather unique application, and I also note that you said the application was a Frame 9 unit, and that you didn't specify whether it was a Frame 9<b>E</b> or a Frame 9<b>F</b>...

When did you first notice this differential? Why is it perceived to be a problem? What other issues/symptoms/conditions are you trying to resolve by calibrating LFBV LVDT feedback? It's presumed when you say "...constant feedback difference..." you mean a differential between the actual...

rastafier, 1) If you follow the path of Hydraulic Supply through VH3-1 when 20TV-1 is de-energized, you will soon find that IGVs are being driven to the closed position by the Hydraulic Supply pressure (flow). Flow through the servo-valve is blocked, but high pressure Hydraulic Supply is...

Namatimangan08, You have given us a lot of pause and have made many of reflect on our understandings and experiences. You are welcome to your understanding and interpretation and you are even free to speak what you believe to be true (freedom of speech is an awesome thing!). Others are...

So, Bruce Durdle, are you saying that during loading of a machine that it's frequency will increase (say to 50.5 Hz) for a brief period of time (how long, please--just an estimation is all that's required) and that the generator being loaded is actually out of sync with the other generators with...

F=(P*N)/120 There might be angular differences between machines, but significant frequency differences? No. Not even 0.1 Hz for any appreciable period of time (more than milliseconds). As suggested by others, acceleration differences will result in momentary (millisecond) frequency...

Ravi, I'm not judging any system. I'm simply trying to point out that 50 Hz in some parts of the world is not 50 Hz. And, I have been told many times the system is a 50 Hz system, but in reality the frequency is almost never 50 Hz, it almost always runs at something more or less--and I don't...

Thank you, very much, Bruce Durdle. I was so hoping you would weigh in on this topic (I almost asked you specifically for your experience in an earlier post!). > So yes you will see changes in speed across the system - but no the system as > a whole will not lose synchronism. And that...

Sunil Kumar wrote: > But there will not be any difference between frequency and voltage > when the machine sychronised with the grid. (except in transient condition). > This is my opinion and experience. Thank you, Sunil Kumar. This is <b>exactly</b> the same as my experience...

Namatingan08, > Perhaps we have to look from "How things could go wrong with parallel > generators under synchonism [sic] first" before looking for a simple steady state operations. There are so many things wrong with your posts on this thread, and that's without taking into consideration...

Namatimangan08, Realizing that you probably work in a certain Asian sub-continental region of the world famous for lack of frequency control and poor grid frequency regulation you may indeed see more unusual circumstances than many readers here. Actually, that might be changing as this site...

Namatimangan08, You wrote: > To provide direct answer to your question, I would say most medium to big > grids have little problem to deal with frequency deviation between two parallel > generator up to 30rpm for a 3000rpm system. How long can "...most medium to big grids..." deal...

Suhail, How are you relating liquid fuel pressure to back-flow through the gas fuel nozzles and manifold? This must be a pretty old machine, even with a Mark VI, because most dual-fuel GE-design heavy duty gas turbines built since the mid-1980's were equipped with gas fuel nozzle purge...

> With due respect, CSA has small problem to understand the argument along this line. Okay, Namatimangan08, so exactly how much does the speed differ between synchronous generators connected in parallel to each other and supplying a common load? Please be precise. 1 RPM; 10 RPM; a...

Hello! SCLEDATA.DAT is the file used by IDOS to display the engineering units and values of data on the <I>. It will either be equal to ENGLISH.SCA, METRIC.SCA, HARDWARE.SCA, or CUSTOM.SCA. Usually there is a selection on the Main Menu to switch between English and Metric display...

Well, well, well. I decided to drop in and visit my Ye Olde Haunt, and I find this gem of a reply. The <b>ONLY</b> file that needs to be changed to change alarm text is ALARM.DAT. ALARM.LST is generated from ALARM.DAT by running ALARM_L.EXE. LONGNAME.DAT is used by the Control Sequence...