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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
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]