Medium Voltage Power Cables Catalogue - AEC Online
Medium Voltage Power Cables Catalogue - AEC Online
Medium Voltage Power Cables Catalogue - AEC Online
Create successful ePaper yourself
Turn your PDF publications into a flip-book with our unique Google optimized e-Paper software.
Rated Temp.<br />
Minimum tensile strength<br />
Minimum elongation at break<br />
Relative permittivity ( Dielectric constant )<br />
Thermal resistivity<br />
Specific gravity<br />
Dielectric power factor at max. conductor temperature (tan δ)<br />
Heat deformation at 150 ºC<br />
Solvent resistance<br />
Splicing & termination<br />
Environmental stress cracking<br />
- Normal<br />
- Emergency<br />
- Short circuit<br />
90 °C<br />
130 °C<br />
250 °C<br />
12.5 N / mm 2<br />
200 %<br />
2.5<br />
3.5 °C.m / W<br />
0.93 g / cm 3<br />
40 x 10 -4<br />
Good<br />
Good<br />
Easy<br />
Good<br />
Processing of XLPE Insulation<br />
Cross-linked polyethylene via organic peroxide has emerged as the dominant process technology employed throughout<br />
the world for medium voltage cables. The choice of the cross-link additives and the stabilizer has a significant influence<br />
on the short and long term performance of medium voltage cables as well as the extrusion characteristics of the insulation<br />
compounds.<br />
Cross-linked polyethylene is obtained through a first order reaction of high molecular polyethylene with the thermally<br />
driven hemolytic cleavage of the peroxide bond (Fig. 1).<br />
ROOR 2 RO<br />
PH + RO P + ROH<br />
2 P P-P<br />
Where<br />
ROOR : Peroxide<br />
RO : Alkoxy radical<br />
P : Polymer<br />
P : Polymer radical<br />
Fig. 1: Peroxide Cross-linking Reaction Sequence in Polyethylene
Change language