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Radius of screen (outer)

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

Symbol
$r_{z3,sc}$
Unit
m
Formulae
$\left(\frac{d_{sc}}{2}+t_{sc}\right) \frac{1}{1000}$
Related
$d_{sc}$
Mean diameter of screen [mm]
$t_{sc}$
Thickness of the screen [mm]
Used in
$\mathscr{z}_{3,sc}$
Impedance of screen inner surface [$\Omega$/m]
$\mathscr{z}_{4,sc}$
Mutual impedance of screen [$\Omega$/m]
$\mathscr{z}_{5,sc}$
Impedance of screen outer surface [$\Omega$/m]
$\mathscr{z}_6$
Impedance of insulation between screen and sheath [$\Omega$/m]