Gentlepeople... to more adequately explain the phenomenon known as "Armature Reaction in Synchronous Generators" I intend to issue a "white paper!"

It will include both the magnetic and electrical relationships. However, previous "text only" dialog has led to further confusion and misinformation, as well as a disbelief in some of the jargon and descriptive wording. As I said in an earlier post, "It's like trying to describe a 'ratchet' without using your hands." And if you were raised in an Italian family, it's virtually impossible to describe something without using "hand-speak!"

Therefore, the 'paper' will contain pertinent diagrams and formulae that are difficult to produce in this forum. So, anyone interested in the full-blown version should forward an e-mail address. Of course, the 'text-only' version will be sent to the List!

Regards, Phil Corso, PE {Boca Raton, FL, USA} [[email protected]] ([email protected])

 

The disbelief remark was only in reference to "aiding the rotor field" being used to describe what happens during underexcited operation. Underexcited operation is a very common term, used in most parts of the world. But, this author has never encountered the "aiding the rotor field" description being used to describe the armature reaction which occurs when the field flux is reduced. It's just kind of an odd description.... Hopefully your paper will address this term, in particular. Put this author on the list, please!

This author is considering moving to another forum which does accept drawings and sketches and has user information (avatars). Anyone know of a good one?

Viva Italia!

markvguy

 

In reply to markvguy and with regards to sharing drawings and sketches, embedding arbitrary images directly into a forum such as this would have a number of problems. It would be a security problem (viruses embedded in images), it would cause problems for people on dial-up modems (taking a long time to download images), and arbitrary images can also cause formatting and display problems for web pages (some unkind people do this deliberately to web forums that allow images).

The way most forums deal with this is to allow links to outside image hosts. There are a number of free image hosts which exist specifically for this. One such host is "Tinypic" http://tinypic.com (there are others as well). There is no cost and no registration. You simply upload the image to their web site, and they give you a unique URL which points to it. You then paste that URL into your e-mail or web forum reply. Anyone interested in the image can
use their web browser to view it, or they can download it.

I've created an example at "http://i12.tinypic.com/29fxzs7.png". Paste this into a web browser address bar, and you will see the example.

As for other forums, I'm not aware of any that have the same depth and breadth of technical knowledge that is found here. I find that this forum seems to offer a more professional level of discussion than can be found elsewhere.

To give you an example, if you use Google to search for "mark V turbine" the top two results are from GE Power, and the next two are from this list. With any suffciently narrowly defined automation subject, you'll find similar
results.

 

Mr. Griffin,

Thanks for the tip! I'm sure it will get a lot of use now that us novice PC users know of it. Your points about security and download times are very prescient.

It's taken a couple of years to get to this point, where control.com listings comes up right after GE's listing. In general, the breadth of knowledge here and the quality of information is very good--better than most! This author has considered himself very lucky to have found this site and to be a part of helping to answer people's questions and (attempt to) solve their Speedtronic turbine control-related problems. It's been satisfying to watch the number of related posts grow over the past three years.

However, when it comes to the Speedtronic turbine control stuff, there aren't many other people responding. It was hoped that after a few months others would begin to add their knowledge and experience to the responses to the posts, but it's still not happening very much after nearly three years.

It would also be nice if we could get a topic area for Speedtronic/heavy duty gas turbine operation and trouble-shooting. The posts are all over the spectrum of topic areas, making searching and responding (without waiting for the automation mail list messages) time-consuming.

The above is misdirected (the conversation should be with the control.com editors and moderators). This author has just learned that there are some improvements in the works--no details, but some of the concerns may be addressed.

Again, thanks very much for the tip about third-party/outside image hosts! It's great food for thought.!.!.!

Are you signing up for Mr. Corso's paper (which is the original topic of this thread...)?

Your tip about the image hosting sites is very much appreciated, Mr. Griffin.

markvguy

 

In reply to markvguy - As far as the number of people responding on Speedtronic turbine control topics is concerned, I think if you look at any subject you will find that a limited number of people provide the majority of the useful responses. We try to share information to what degree we can, but the reality is that for many subjects there are really only a few people on this list (or anywhere else in the world) who have something useful to say. The nice thing about this list however, is that there are people who really do know what they are talking about.

I try to limit my own responses to where I think I have something useful to contribute. I read all the postings however, as it often gives me the opportunity to learn something new.

As far as topics are concerned, given the number of turbine control postings that are occuring now this list could indeed use a new topic to contain them. Perhaps the topic could cover energy utility subjects such as gas and steam turbines, boilers, power generation, substations, transmission lines, pipeline compressors, and other related control items. I suspect that the majority of the postings in this proposed topic would be related to Speedtronic turbine control, but discussion tends to flow into these other areas as well (including such things as armature reaction in generators).

As far as Mr. Corso's paper is concerned, perhaps the list moderators would agree to host it in the "PLC Archive" (which appears to be otherwise more or less moribund at this point). As long as we are talking about minor changes to the list, it could be renamed to "Document and Program Archive". A suggestion for rules for submitting documents would be that they must be submitted by the author or by someone who otherwise holds copyright, or are published under a license which permits free distribution (e.g. Creative Commons or other similar licenses), and that they are relevant to recent discussion.

 

I've finally completed the white paper promised some eons ago. The "text-only" version has proven to be quite long, so it will not be posted here after all. If anyone wants the full, unabridged version, just contact me!

Regards, Phil Corso, PE {Boca Raton, FL, USA} [[email protected]] ([email protected])