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Impedance insulation shield—armour

Definition according to Cigre TB 531 chap. 4.2.1 ($z_6$)

Symbol
$\mathscr{z}_{34}$
Unit
$\Omega$/m
Formulas
$\frac{j \omega \mu_0}{2\pi} \ln\left(\frac{r_{z4}}{r_{z3}}\right)$
Related
$\mu_0$
Vacuum permeability [H/m]
$\omega$
Angular frequency [rad/s]
$\pi$
Archimedes' constant $\pi$
$r_{z3}$
Radius shield (outer) [m]
$r_{z4}$
Radius armour (inner) [m]
Used in
$\mathscr{z}_{os}$
Impedance outersheath [$\Omega$/m]