Self reactance of armour

Symbol
$X_{ar}$
Unit
$\Omega$/m
Formulae
$\omega \frac{\mu_0}{2\pi} \ln\left(\frac{2s_c}{d_{ar}}\right)$default cable without transposition
$\omega \frac{\mu_0}{2\pi} \ln\left(\frac{2a_m}{d_{ar}}\right)$default cable with regular transposition
$\omega \frac{\mu_0}{2\pi} \ln\left(\frac{2L_{earth}}{d_{ar}}\right)$1 cable with earth return