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XLPE buried cable laying methods

Release time:2016-09-09 11:30 hit:


Mechanical considerations
Apart from the electrical and thermal aspects of the cable design, it is necessary to consider the mechanical and thermomechanical stresses to which the cable system will be subjected during installation and service.
 
Stresses due to winding andbending
An elementary comparison can be made between a cable and a beam.
When the cable is bent, the neutral fibre becomes the cable axis and the stretched fibre is elongated according to the following formula:
& = De / Dp
& : elongation
where De is the outside diameter of the cable and Dp is the bending diameter.
 
The compressed wire is subjected to the same deformation but with the opposite sign.
It is customary to express the cable deformation limit by a minimum ratio between the bending or winding diameter and the outside diameter of the cable. This ratio is reciprocal to the maximum permitted deformation Emax.
XLPE buried cable laying methodsXLPE buried cable laying methods


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