Cableizer ®

Equivalent diameter of screen/sheath and armour

Equivalent diameter between screen/sheath and armour. It becomes the equivalent diameter between screen and sheath when no armour is present.

Symbol
$d_{e}$
Unit
mm
Formulas
$\sqrt{\frac{{d_{s}}^2+{d_{ar}}^2}{2}}$single-core cable or cable with common sheath
$\frac{d_{s}}{2}+\frac{d_{ar}}{2}$cable with separate sheaths or separate screen and no sheath
$d_{s}$no armour
$d_{ar}$armour but no screen and no sheath
$d_{s}$CIGRE TB 880 Guidance Point 26
Related
$d_{ar}$
Mean diameter armour [mm]
$d_{s}$
Equivalent diameter of screen and sheath [mm]
Used in
$\Delta_{1}$
Substitution coefficient $\Delta_1$ for eddy-currents
$\Delta_{2}$
Substitution coefficient $\Delta_2$ for eddy-currents
$\lambda_{0}$
Substitution coefficient $\lambda_0$ for eddy-currents
$\lambda_{12}$
Loss factor shield, eddy currents
$X_{S1}$
Reactance section 1 [$\Omega$/m]
$X_{S2}$
Reactance section 2 [$\Omega$/m]
$X_{S3}$
Reactance section 3 [$\Omega$/m]