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lay losses

English translation: differences between cable (axial) length and helical length of wires in the screen

GLOSSARY ENTRY (DERIVED FROM QUESTION BELOW)
English term or phrase:lay losses
Selected answer:differences between cable (axial) length and helical length of wires in the screen
Entered by: Charles Davis

15:18 Apr 23, 2015
English language (monolingual) [PRO]
Tech/Engineering - Electronics / Elect Eng
English term or phrase: lay losses
This term - ''lay losses'' [of copper wires screen] is used in a specification for a high-voltage cable. More context can be viewed here: http://s12.postimg.org/r0zx5ytzh/lay_losses.jpg

What kind of losses are these?

Any help would be greatly appreciated.
Grzegorz Mysiński
Poland
Local time: 09:23
differences between cable (axial) length and helical length of wires in the screen
Explanation:
Amazing what you can find out on the Internet. I had no idea about this, but I think I've got it.

Screen, also known as shield, is a conductive layer wrapped around a cable core, forming a barrier to interference:

"Any barrier to the passage of interference - causing electrostatic or electromagnetic fields, formed by a conductive layer surrounding a cable core. It is usually fabricated from a metallic braid, foil or wire serving."
http://www.pmel.org/wire-cable-glossary.htm

If it's wire, it's coiled around the core in a helical (spiral) pattern.

"Lay", or "lay length", is:

"The distance along a cable occupied by one complete helix of a strand or conductor."
(Same source)

In other words, we're talking about strands of wire in a helical pattern.

Well, the lay loss is the difference between the length of the cable and the length of the helical strands: the differencie between the axial length and the helical length:

"axial length is the actual length of cable, so if you cut a 1 metre length from the drum and then dismantle it, unwind one of the cores and straighten it, you will find that the length of core is greater than 1 metre, this is the helical length. The difference between the helical length and the 1 metre axial length is the lay loss."
https://www.linkedin.com/groups/can-any-one-tell-me-4670274....

It's often expressed as a percentage:

"In one preferred embodiment, 24 fibers are wound helically With a 3—6% lay loss (i.e., in which the fibers are 3—6% longer than the cable) around a central strength member"
http://patentimages.storage.googleapis.com/pdfs/US6104846.pd...

You could think of it as the loss of length that results from winding a straight piece of wire into a helix.
Selected response from:

Charles Davis
Spain
Local time: 09:23
Grading comment
This is just great, thank you very much, Charles!
4 KudoZ points were awarded for this answer



SUMMARY OF ALL EXPLANATIONS PROVIDED
4 +2differences between cable (axial) length and helical length of wires in the screen
Charles Davis


Discussion entries: 1





  

Answers


6 hrs   confidence: Answerer confidence 4/5Answerer confidence 4/5 peer agreement (net): +2
differences between cable (axial) length and helical length of wires in the screen


Explanation:
Amazing what you can find out on the Internet. I had no idea about this, but I think I've got it.

Screen, also known as shield, is a conductive layer wrapped around a cable core, forming a barrier to interference:

"Any barrier to the passage of interference - causing electrostatic or electromagnetic fields, formed by a conductive layer surrounding a cable core. It is usually fabricated from a metallic braid, foil or wire serving."
http://www.pmel.org/wire-cable-glossary.htm

If it's wire, it's coiled around the core in a helical (spiral) pattern.

"Lay", or "lay length", is:

"The distance along a cable occupied by one complete helix of a strand or conductor."
(Same source)

In other words, we're talking about strands of wire in a helical pattern.

Well, the lay loss is the difference between the length of the cable and the length of the helical strands: the differencie between the axial length and the helical length:

"axial length is the actual length of cable, so if you cut a 1 metre length from the drum and then dismantle it, unwind one of the cores and straighten it, you will find that the length of core is greater than 1 metre, this is the helical length. The difference between the helical length and the 1 metre axial length is the lay loss."
https://www.linkedin.com/groups/can-any-one-tell-me-4670274....

It's often expressed as a percentage:

"In one preferred embodiment, 24 fibers are wound helically With a 3—6% lay loss (i.e., in which the fibers are 3—6% longer than the cable) around a central strength member"
http://patentimages.storage.googleapis.com/pdfs/US6104846.pd...

You could think of it as the loss of length that results from winding a straight piece of wire into a helix.


Charles Davis
Spain
Local time: 09:23
Native speaker of: English
PRO pts in category: 8
Grading comment
This is just great, thank you very much, Charles!

Peer comments on this answer (and responses from the answerer)
agree  Tushar Deep
10 hrs
  -> Thanks, Tushar!
agree  jccantrell: It IS amazing what you can find out.
16 hrs
  -> Thanks, JC! And it's really good fun (at least I find it so) :)
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