I first posted this under Acoustics 1

[izax1]

I first posted this under Acoustics/Vibration Engineering, but this forum might be more appropriate.

I need to know what kind of mechanical loading (I would assume shock load) is produced when a 22kV circuit is shorted. Experience from real life says that a wall some distance away (approx 0.5 m) is destroyed (part of the wall blown away).

Can anyone point me to where I can find information??

I am a mechanical engineer, so any explanations of what happens from an electrical point needs to be fed by teaspoons, I'm afraid. If I can get an expression of the shock load (magnitude, form, duration) I will apply that to the wall to determine plate thiskness and support design.

Thanks a lot!

 

[walker1]

I'm neither a power engineer nor working with Acoustics/Vibration myself, but we have a few people doing Acoustics/Vibration Engineering here.

I take you have a certain amount of power in your 22 kV feed ?
(I would not expect mA would blow down a wall unless maybe of paper

The spark from a major short circuit can, however, produce quite a large shock wave. (Think about lightning and thunder)
Something to do with expanding, super heated air/plasma.

I would guess the amount of power available could give a better estimate of the damage to expect.

 

[busbar]

A classical paper on the matter is Pressures Developed by Arcs, Ralph H. Lee, Transactions on Industry Applications, vol. 1A-23, No 4, July/August 1987 from IEEE.org

 

[izax1]

Thanks for info. The article from Busbar was just what I was looking for.

Thanks

 

[chuckhydro]

Thread 238-6424 has some very interesting discussion of the energy dissipated from a short circuit including the TNT equivalent energy.

 

[jbartos]

Suggestion: Transactions on Industry and Applications Vol. 1A-23 should read IA-23, just in case it is searched for in databases.

 

[jbartos]

Suggestion: Visit

http://www.squared.com/us/products/...0b2d415785256d6e004d3689/$FILE/0613BR0302.pdf

for: various aspects pertaining to arcing, safety, standards, technology, etc.

 

[busbar]

Thank you for the correction, jbartos. I also failed to mention that the subject paper is available as a free online pdf from one of the IEEE societies.

http://www.ieee-pcic.org/archive/arcs.pdf

 

[izax1]

Thanks a lot for info. I have already downloaded the article by Lee, and found some very interesting info on thread 238-6424.

 

[jbartos]

Suggestion: Visit

http://search.netscape.com/ns/boomf...ph+H.+Lee%22&clickedItemURN=http%3A%2F%2F

http://www.ieee-pcic.org%2FBase%2Fa...url=http://www.ieee-pcic.org/Base/archive.htm

for the Busbar posting recommended paper
(under 1987 click on "Pressures developed by arcs&quot