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Impedance internal of cable

Definition according to Cigré guide 531 chapter 4.2.1

Symbol
$\mathscr{z}_{int}$
Unit
$\Omega$/m
Formulae
$\mathscr{z}_1+\mathscr{z}_2+\mathscr{z}_3$
Related
$\mathscr{z}_1$
Impedance of conductor outer surface [$\Omega$/m]
$\mathscr{z}_2$
Impedance of insulation between conductor and screen [$\Omega$/m]
$\mathscr{z}_3$
Impedance of shield inner surface [$\Omega$/m]
Used in
$\gamma_{prop}$
Cable propagation constant
$Z_{ch}$
Surge impedance [$\Omega$]