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Geometric mean distance between earth continuity conductor and the cables of the same system

Definition according to Cigré guide 531 chapter 4.2.3.9

Symbol
$GMD_t$
Unit
m
Formulae
$\left(a_{1t} a_{2t} a_{3t}\right)^{\frac{1}{3}} \frac{1}{1000}$Flat formation with transposed cables and parallel earth continuity conductor
$0.7GMD$Flat formation with transposed earth continuity conductor
Related
$a_{1t}$
Distance between phase 1 + earth continuity conductor [mm]
$a_{2t}$
Distance between phase 2 + earth continuity conductor [mm]
$a_{3t}$
Distance between phase 3 + earth continuity conductor [mm]
$GMD$
Geometric mean distance between phases of the same system [m]
Used in
$Z_{mt}$
Equivalent mutual impedance between earth continuity conductor and any cable [$\Omega$/m]