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Catenary
2

Catenary

Catenary

(OP)
Hi Engineers,

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

Cheers!

RE: Catenary

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

RE: Catenary

(OP)
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

RE: Catenary

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.

RE: Catenary

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.
  

RE: Catenary

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.

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