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Inductance $H_2$ 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
Formulas
${10}^{-7}\pi \mu_{e} \frac{n_{ar} {d_{f}}^2}{L_{lay,ar} d_{ar}}sin\left(\phi_{ar}\right)sin\left(\gamma_{ar}\right)$
Related
$d_{ar}$
Mean diameter armour [mm]
$d_{f}$
Diameter armour wire [mm]
$e$
Constant $e$ [m/s$^2$]
$\gamma_{ar}$
Angular time delay [rad]
$H_{1}$
Inductance $H_1$ armour [H/m]
$H_{3}$
Inductance $H_3$ armour [H/m]
$L_{lay,ar}$
Length of lay armour [mm]
$\mu_{e}$
Longitudinal relative permeability steel wires
$n_{ar}$
Number of wires armour
$\phi_{ar}$
Angle between armour and cable axis [rad]
$\pi$
Archimedes' constant $\pi$
Used in
$B_{2}$
Loss coefficient $B_2$ armour [$\Omega$/m]