Inductance of phase 1

Symbol
$L_1$
Unit
H/m
Formulae
$\frac{\mu_0}{2\pi} \left(\ln\left(\frac{\sqrt{a_{12} a_{31}}}{GMR}\right)+1j \sqrt{3} \ln\left(\frac{a_{12}}{a_{31}}\right)\right)$three-phase system, individual
$\frac{\mu_0}{2\pi} \ln\left(\frac{a_{12}}{GMR}\right)$three-phase system, trefoil
$\frac{\mu_0}{2\pi} \left(\ln\left(\frac{\sqrt{2} a_{12}}{GMR}\right)-1j \sqrt{3} \ln\left(\sqrt{2}\right)\right)$three-phase system, flat equal distance
$\frac{\mu_0}{2\pi} \ln\left(\frac{a_m}{GMR}\right)$multi-core cable
Used in