Component of inductance $H_1$ of armour

1st 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
$H_1$
Unit
H/m
Formulae
${10}^{-7}\pi \mu_e \frac{n_{ar} {t_{ar}}^2}{p_{ar} d_{ar}}sin\left(\phi_{ar}\right)cos\left(\tau_{ar}\right)$
Used in