Mutual reactance between conductors i + j

Definition according to Cigre TB 531 chap. 4.2.3.7

Symbol
$X_{ij}$
Unit
$\Omega$/m
Formulas
$\omega \frac{\mu_0}{2\pi} \ln\left(\frac{D_E}{S_{ab}}\right)$phase 1 — phase 2
$\omega \frac{\mu_0}{2\pi} \ln\left(\frac{D_E}{S_{bc}}\right)$phase 2 — phase 3
$\omega \frac{\mu_0}{2\pi} \ln\left(\frac{D_E}{S_{ac}}\right)$phase 3 — phase 1