Cableizer
Log in

Impedance of insulation between shield and armour

Definition according to Cigré guide 531 chapter 4.2.1 ($z_6$)

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