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Radius of armour (inner)

Definition according to Cigré guide 531 chapter 4.2.1

Symbol
$r_{z4}$
Unit
m
Formulae
$\frac{\frac{D_{ab}}{2}}{1000}$
Related
$D_{ab}$
Diameter over armour bedding [mm]
Used in
$\mathscr{z}_{34}$
Impedance of insulation between shield and armour [$\Omega$/m]
$\mathscr{z}_g$
Impedance of earth return in ground [$\Omega$/m]
$\mathscr{z}_{pin}$
Impedance of armour inner surface [$\Omega$/m]
$\mathscr{z}_{pmut}$
Mutual impedance of armour [$\Omega$/m]
$\mathscr{z}_{pout}$
Impedance of armour outer surface [$\Omega$/m]