Cableizer
Log in

Impedance of insulation between screen and sheath

Definition according to Cigré guide 531 chapter 4.2.2.5 for composite screen and sheath

Symbol
$\mathscr{z}_6$
Unit
$\Omega$/m
Formulae
$\frac{j \omega \mu_0}{2\pi} \ln\left(\frac{r_{z2,sh}}{r_{z3,sc}}\right)$
Related
$\mu_0$
Vacuum permeability [H/m]
$\omega$
Angular frequency [rad/s]
$\pi$
Archimedes' constant $\pi$
$r_{z2,sh}$
Radius of sheath (inner) [m]
$r_{z3,sc}$
Radius of screen (outer) [m]
Used in
$\mathscr{z}_3$
Impedance of shield inner surface [$\Omega$/m]
$\mathscr{z}_4$
Mutual impedance of shield [$\Omega$/m]
$\mathscr{z}_5$
Impedance of shield outer surface [$\Omega$/m]