Cableizer ®

Cross-sectional area screen

For round and flat wires, the cross-sectional area of the screen is increased by an elongation factor.

Pipe-type cables are often manufactured with tapes that are 22.225 mm (0.825'') in width and are lapped 3.175 mm (0.125'') as described in CIGRE TB 880.

Symbol
$A_{sc}$
Unit
mm$^2$
Formulas
$\left(\frac{t_{sc}}{2}\right)^2 \pi n_{scw} \left(1+\frac{\nu_{sc}}{100}\right)$round wires
$t_{sc} w_{sc} n_{scw} \left(1+\frac{\nu_{sc}}{100}\right)$flat wires
$\left(\left(\frac{D_{sc}}{2}\right)^2-\left(\frac{D_{scb}}{2}\right)^2\right) \pi$tape
$n_{scw} t_{sc} w_{sc}$pipe-type cable tape CIGRE TB 880 Sample case 3
Related
$D_{sc}$
Diameter over screen [mm]
$D_{scb}$
Diameter over screen bedding [mm]
$n_{scw}$
Number of wires screen
$\nu_{sc}$
Elongation screen [$\%$]
$\pi$
Archimedes' constant $\pi$
$t_{sc}$
Thickness screen [mm]
$w_{sc}$
Width flat screen wires [mm]
Used in
$m_{sc}$
Mass metallic screen [kg/m]
$Q_{sc}$
Thermal capacitance screen [J/(m.K)]
$R_{sc}$
Electrical resistance screen [$\Omega$/m]
$\rho_s$
Specific electrical resistivity shield (screen/sheath) [$\Omega$.m]