Catenary 2

[Danilo917]

Hi Engineers,

any suggestion on what formula to use to create a catenary given the sag and span of conductors?

Cheers!

 

[wareagle]

http://www.google.com/search?source...-8&rlz=1T4GGLL_en&q=conductor+sag+calculation

 

[alehman]

See thread238-8018

Alan
“The engineer's first problem in any design situation is to discover what the problem really is.” Unk.

 

[desertfox]

Hi Danil017

Try this link:-

http://www.slideruleera.net/USSWireRopeEngrHandBook.zip

Its from another member on this site


desertfox

 

[Danilo917]

Thanks for your replies..I find it really so useful..ill ask more question about your posts in a short while..thanks again.

 

[Danilo917]

Hi Engineers,

Another question/request,i wonder if the simple catenary can be designed using MSExcel given the sag and span for level and un-level condition?

thanks

 

[alehman]

I'm sure it can. You need to account for the physical properties of the particular conductor material, such as stress/strain characteristics, thermal expansion and creep.

This is an excellent reference.

http://www.southwire.com/transmission/OCM.htm

If you are designing a line, you would probably be better to hire someone with experience in this area, as there is a lot to know.

Alan
“The engineer's first problem in any design situation is to discover what the problem really is.” Unk.

 

[jghrist]

You can use Excel for simple catenaries without stress/strain characteristics, thermal expansion, and creep if you are only interested in one loading/temperature condition.

You need these conductor characteristics if you need to find the sag-tension at a different loading/temperature condition. For instance, you might want to calculate the stringing sag and tension at 60°F to get a sag at 120° final with wind. For this, an Excel spreadsheet may not be feasible because the calcuations are pretty complex, especially for a composite conductor like ACSR.

 

[alehman]

If your time is worth anything, it might be more economical to buy something like this:

http://www.sag10.com

Alan
“The engineer's first problem in any design situation is to discover what the problem really is.” Unk.