Geometric mean radius of the ground conductor

Definition according to IEEE 575-2014 Annex E.1.3.3

This corresponds to parameter GMR_p in Energies 2022, 15-05010 used to calculate E_p

Symbol
$r_g$
Unit
m
Formulae
$\frac{0.75\frac{d_{ecc}}{2}}{1000}$