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Mutual impedance between phase conductor and metal screen with earth return

Definition according to Cigré guide 531 chapter 4.2.3.6

The mutual reactance between the phase conductor and the metal sheath is equal to the sheath reactance $X_s$ when the conductor is concentric within the sheath.

Symbol
$Z_m$
Unit
$\Omega$/m
Formulae
$R_E+j X_s$
Related
$R_E$
Equivalent resistance of earth return path [$\Omega$/m]
$X_s$
Self reactance of screen/sheath [$\Omega$/m]
Used in
$Z_d$
Positive sequence impedance [$\Omega$/m]
$Z_h$
Zero-sequence impedance [$\Omega$/m]