Impedance of insulation between conductor and screen

Definition according to Cigré guide 531 chapter 4.2.1

Symbol

$\mathscr{z}_2$

Unit

$\Omega$/m

Formulae

$\frac{j \omega \mu_0}{2\pi} \ln\left(\frac{r_{z2}}{r_{z1}}\right)$

Related

$\mu_0$

Vacuum permeability [H/m]

$\omega$

Angular frequency [rad/s]

$\pi$

Archimedes' constant $\pi$

$r_{z1}$

Radius of conductor [m]

$r_{z2}$

Radius of shield (inner) [m]

Used in

$\mathscr{z}_{cc}$

Impedance of conductor [$\Omega$/m]

$\mathscr{z}_{int}$

Impedance internal of cable [$\Omega$/m]