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Radius of sheath (inner)

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

Symbol
$r_{z2,sh}$
Unit
m
Formulae
$\left(\frac{d_{sh}}{2}-t_{sh}-\frac{\Delta d_{sh}}{2}\right) \frac{1}{1000}$
Related
$d_{sh}$
Mean diameter of sheath [mm]
$\Delta d_{sh}$
Depth of corrugation [mm]
$t_{sh}$
Thickness of the sheath [mm]
Used in
$\mathscr{z}_{3,sh}$
Impedance of sheath inner surface [$\Omega$/m]
$\mathscr{z}_{4,sh}$
Mutual impedance of sheath [$\Omega$/m]
$\mathscr{z}_{5,sh}$
Impedance of sheath outer surface [$\Omega$/m]
$\mathscr{z}_6$
Impedance of insulation between screen and sheath [$\Omega$/m]