Fault Calculations Using the MVA Method 2

[umrpwr]

I would like to start a new thread and get some feedback and information on a topic that was previously discussed in this forum. The topic was on fault calculations using what is known as the MVA method.

Apparently there was paper written by Moon H Yuen, but unfortunately after searching I have been unable to locate a copy of this paper. Does anyone know where I might be able to get a copy of this paper? I already have the book "Short Circuit Calculations The Easy Way" by J.R. Seiver and John Paschal, but would like to read the original paper.

Secondly I have read the thread and comments from the original post, but would like to get some further feedback from others. What are the limitations of this method in particular in comparison to using the P.U. method. How much deviation is there in calculation of fault values and are there any pitfalls in particular? Does this method just provide a good cursory check of fault values or are the values good enough to perform coordination and protective relaying studies? I would welcome any comments since I think most can appreciate how tedious performing faults studies by hand can be particularly using the P.U. method. I am just suspect of any book that claims to be quote "The Easy Way" and have something new and profound. That is why I would like to see a copy of the Moon H Yuen paper. Especially since there is no mention of this paper or citation of it anywhere in the book. Perhaps it is more a case of what is old is new again.

Thank you in advance for your comments and feedback.

 

[jbartos]

Suggestion: If the paper was published by IEEE, they might be a way to obtain more information about the paper and its copy from:

http://www.ieee.org

I also post a link to the previous thread to avoid any repetitions in this thread:

http://www.eng-tips.com/viewthread.cfm?spid=238&newpid=238&sqid=45636

 

[umrpwr]

Hi Jbartos,

I appreciate the suggestion. I did do a search of IEEE for the Moon H Yuen paper and was not able to locate it. The on-line database is not archived as far back as when that was written so I have not been able to locate it there. I have also not had any success doing an on-line search either.

 

[jbartos]

Suggestion: It may be necessary to contact the IEEE over the telephone and ask them to provide the information about that paper. They have so-called "Cumulative Index" of published papers that lists Authors and Titles of published Papers. I checked the cumulative index of Power Apparatus and Systems 1975-1984. There is no record of Moon H Yuen. The paper might have been published prior to 1975 or in a different periodical.

 

[jghrist]

A Google search finds:

"Moon H. Yuen was a biotech engineer for Bechtel Corporation for 27 years. Realizing he will never be promoted from his mid-level management position, he formed his own company, YEI Engineers Inc."

Also:

YEI Engineers, Inc.
Contact: Sonia Siu
Address: 7700 Edgewater Dr #828
Oakland, CA 94621
Phone: (510) 383-1050

Don't know if it's the same Moon H. Yuen or if YEI is his company, but it's a start.

 

[GJJ]

Short Circuit ABC - Learn it in an Hour, Use It Anywhere, Memorize No Formula (Paper TOD-73-132) was approved by the Petroleum and Chemical Industry Committee of the IEEE Industry Application Society for presentation at the 1973 Petroleum and Chemical Industry Conference, Houston, Texas, September 17-19. Manuscript was released for publication October 01, 1973.

If you give IEEE the above information, they should be able to locate a copy of the paper for you.

 

[busbar]

Moon H Yuen's “MVA Method” paper may have been published in Transactions on Industry Applications, which is listed as published since 1965.

He was located in the East Bay area, so the Oakland address may be of his successor.

“Yuen M. H.” is listed in the author index at IEEEX online, but only on three more recent [1988-1990] conference/journal papers. The subject paper may predate the online author database.

 

[GJJ]

IEEE Transactions on Industry Applications, Vol. IA-10, No.2, March/ April 1974

Short Circuit ABC - Learn It in an Hour, Use It Anywhere, Memorize No Formula

Moon H. Yuen, Senior Member, IEEE

 

[umrpwr]

GJJ

Thank you for the information and tracking that down. That will greatly help in locating a copy of the article.

Thanks,

umrpwr

 

[jbartos]

Suggestion: The discussed method is also published in:
Alvin H. Knable "Electrical Power Systems Engineering Problems and Solutions," McGraw-Hill Book Company, 1967
Section 8-1 Two Ways to Calculate Symmetrical Short Circuits, on pages 227-230
There is a nomograph given in Figure 8-2 Momograph for Combining Short-Circuit kVA in Series.
This publication precedes the Yuen paper by about 7 years.
Unfortunately, there are no references where this method came from. It appears to be lacking any proof. There may be some restrictions to its validity and accuracy. I do not think that the current software is using it since they have to calculate unsymmetrical faults. This method appears to be suitable for symmetrical faults.

 

[advidana]

Per-unit has been around a long time. It use to be percentage and kva was used instead of MVA. Element of Power Sytems Analysis 2nd edition by Stevenson 1962 is a good copy to read for per unit example, if you are find it. His latest edition dropped the examples. It's a simple system once you get the hang of it. It's like power of tens to get thru calculating different transformer voltage ratio systems. I now to use the computer to do these calcs.
A.D.Vidana

 

[mykh]

Check

http://www.arcadvisor.com

Short circuit online calculator presented on the wesite is based on MVA method for solving industrial power system short circuits described in the Moon H Yuen paper, but makes the adjustments for variable X/R ratios. The contribution from each motor, generator and the utility source is vectorally added at every point where they intersect. This provides an extremely accurate analysis of the maximum short circuit MVA any node can be subject to. Contact the web-site developer. I'm sure he'll be glad to provide you with copy of the original paper