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Impedance of jacket

Definition according to Cigré guide 531 chapter 4.2.1

Symbol
$\mathscr{z}_{56}$
Unit
$\Omega$/m
Formulae
$\frac{j \omega \mu_0}{2\pi} \ln\left(\frac{r_{z6}}{r_{z5}}\right)$
Related
$\mu_0$
Vacuum permeability [H/m]
$\omega$
Angular frequency [rad/s]
$\pi$
Archimedes' constant $\pi$
$r_{z5}$
Radius of armour (outer) [m]
$r_{z6}$
Radius of outer jacket [m]
Used in
$\mathscr{z}_{os}$
Impedance of outersheath [$\Omega$/m]