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Mean diameter of armour

Symbol
$d_{ar}$
Unit
mm
Formulae
$D_{ab}+t_{a,1}+t_{a,2}$
Related
$D_{ab}$
Diameter over armour bedding [mm]
$t_{a,1}$
Thickness of 1st armour [mm]
$t_{a,2}$
Thickness of 2nd armour [mm]
Used in
$A_{ar}$
Cross-sectional area of armour [mm$^2$]
$d_e$
Equivalent diameter of screen/sheath and armour [mm]
$\delta_{ar}$
Equivalent thickness of armour [mm]
$F_{ar}$
Factor $F_{ar}$ for armour losses
$F_{lay,ar}$
Effective length per unit lay length of armour
$GMD$
Geometric mean distance between phases of the same system [m]
$H_1$
Component of inductance $H_1$ of armour [H/m]
$H_2$
Component of inductance $H_2$ of armour [H/m]
$H_3$
Component of inductance $H_3$ of armour [H/m]
$\lambda_2$
Loss factor of armour
$\lambda_{21}$
Loss factor of armour by circulating currents
$\lambda_{22}$
Loss factor of armour by eddy currents
$\phi_{ar}$
Angle between armour and cable axis [rad]
$X_{ar}$
Self reactance of armour [$\Omega$/m]