Medium Voltage Power Cables Catalogue - AEC Online
Medium Voltage Power Cables Catalogue - AEC Online
Medium Voltage Power Cables Catalogue - AEC Online
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Annex G: Materials Properties<br />
Metals Used For <strong>Cables</strong><br />
Table G.1<br />
Electrical Properties<br />
Metal<br />
Relative Conductivity<br />
Copper 100<br />
Electrical Resistivity at<br />
20 °C Ω.m(10 -8 )<br />
Temperature Coefficient<br />
of Resistance per °C<br />
Copper (Annealed)<br />
100<br />
1.7241<br />
0.00393<br />
Copper (Hard drawn)<br />
97<br />
1.7770<br />
0.00393<br />
Tinned Copper<br />
95-97<br />
1.741- 1.814<br />
0.00393<br />
Aluminum<br />
61<br />
2.8264<br />
0.00403<br />
Lead<br />
8<br />
21.40<br />
0.00400<br />
Physical Properties<br />
Property Unit Copper Aluminum Lead<br />
Density at 20 °C<br />
Coeff. of thermal expansion<br />
Kg/m 3<br />
°C x 10 -6<br />
8890.0<br />
17.0<br />
2703.0<br />
23.0<br />
11340.0<br />
29.0<br />
Melting point<br />
°C<br />
1083.0<br />
659.0<br />
327.0<br />
Thermal conductivity<br />
W/Cm.°C<br />
3.8<br />
2.4<br />
0.34<br />
Insulation Materials Used For <strong>Cables</strong><br />
Table G.2<br />
Properties XLPE EPR<br />
Nominal<br />
Rated Temp.<br />
Emergency<br />
Short Circuit<br />
Mechanical Strength Min. Tensile Strength (N/mm 2 )<br />
Min. Elongation %<br />
Heat deformation at 150 °C<br />
Relative permittivity<br />
Specific gravity g/cm3<br />
Solvent resistance<br />
Volume Resistivity at max.<br />
conductor temperature in Ω.cm<br />
normal operation<br />
Splicing & termination<br />
Environmental stress cracking<br />
90<br />
130<br />
250<br />
12.5<br />
200<br />
Good<br />
2.5<br />
0.93<br />
Good<br />
10 12<br />
Easy<br />
Good<br />
90<br />
130<br />
250<br />
4.2<br />
200<br />
Excellent<br />
3.0<br />
1.4<br />
Poor<br />
10 12<br />
Easy<br />
Poor
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