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Equivalent diameter of screen and sheath

Equivalent diameter between screen and sheath.

Symbol
$d_s$
Unit
mm
Formulae
$\sqrt{\frac{{d_{sc}}^2+{d_{sh}}^2}{2}}$single-core cable or sheath and screen both being separate or common
$\sqrt{\frac{\left(F_x d_{sc}\right)^2+{d_{sh}}^2}{2}}$cable with separate screen and common sheath
$d_{sc}$screen but no sheath
$d_{sh}$sheath but no screen or Cigre TB 880 GP 31
$D_{encl}-t_{encl}$PAC/GIL
Related
$D_{encl}$
Outer diameter of enclosure [m]
$d_{sc}$
Mean diameter of screen [mm]
$d_{sh}$
Mean diameter of sheath [mm]
$F_x$
Geometrical distance factor for multi-core cables
$t_{encl}$
Thickness of enclosure [m]
Used in
$d$
Geometric mean shield diameter [m]
$d_e$
Equivalent diameter of screen/sheath and armour [mm]
$GMD$
Geometric mean distance between phases of the same system [m]
$H_s$
Sheath conductance [H/m]
$r_s$
Mean radius of shield [m]
$X_e$
Self reactance of screen/sheath [$\Omega$/m]