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Component of inductance $H_2$ of armour

2nd component of inductance due to armour steel wires.
For steel tape armour, the length of lay $p_a$ is assumed to be equal to the mean diameter of the armour layer $d_{a}$.

Symbol
$H_2$
Unit
H/m
Formulae
${10}^{-7}\pi \mu_e \frac{n_{ar} {t_{ar}}^2}{L_{lay,ar} d_{ar}}sin\left(\phi_{ar}\right)sin\left(\tau_{ar}\right)$
Related
$d_{ar}$
Mean diameter of armour [mm]
$H_1$
Component of inductance $H_1$ of armour [H/m]
$H_3$
Component of inductance $H_3$ of armour [H/m]
$L_{lay,ar}$
Length of lay of armour [mm]
$\mu_e$
Longitudinal relative permeability
$n_{ar}$
Number of wires of armour
$\phi_{ar}$
Angle between armour and cable axis [rad]
$\pi$
Archimedes' constant $\pi$
$t_{ar}$
Thickness of armour [mm]
$\tau_{ar}$
Armour angle [rad]
Used in
$B_2$
Loss coefficient $B_2$ of armour [$\Omega$/m]