Cableizer ®

Equivalent mutual impedance between cables with earth return

Definition according to CIGRE TB 531 chap. 4.2.3.8

Symbol
$Z_{x}$
Unit
$\Omega$/m
Formulas
$R_{E}+j X_{ap}$general case
$\frac{2Z_{c}+Z_{L}}{3}$flat formation, without transposition
Related
$R_{E}$
Equivalent resistance of earth return path [$\Omega$/m]
$X_{ap}$
Equivalent mutual reactance between conductors [$\Omega$/m]
$Z_{c}$
Mutual inductance between middle and outer cables in flat formation with earth return [$\Omega$/m]
$Z_{L}$
Mutual inductance between outer cables in flat formation with earth return [$\Omega$/m]
Used in
$Z_{d}$
Positive sequence impedance [$\Omega$/m]
$Z_{h}$
Zero-sequence impedance [$\Omega$/m]