Third component of inductance due to first layer armour steel wires. For non-touching wires, $H_3$ is zero.

Symbol
$H_{\mathrm{3}}$
Unit
H/m
Formulae
$\frac{d_{\mathrm{f_{\mathrm{1}}}}}{d_{\mathrm{a_{\mathrm{1}}}}} \left(4.0 \cdot 10^{-7} \mu_{\mathrm{t}} \cos^{2}{\left (\beta_{\mathrm{a_{\mathrm{1}}}} \right )} - 4.0 \cdot 10^{-7}\right)$
Related
$\beta_{\mathrm{a_{\mathrm{1}}}}$
$d_{\mathrm{a_{\mathrm{1}}}}$
$d_{\mathrm{f_{\mathrm{1}}}}$
$H_{\mathrm{3_{\mathrm{2}}}}$
Used in
$B_{\mathrm{1_{\mathrm{1}}}}$