Cableizer ®

Self reactance screen/sheath

Definition according to IEEE 575-2014 chapter E.1.4.3.1. (without) and CIGRE TB 531 chapter 4.2.3.8 (with earth return).

Symbol
$X_{s}$
Unit
$\Omega$/m
Formulas
$\omega \frac{\mu_{0}}{2\pi} \ln\left(\frac{1}{r_{s}}\right)$without earth return
$\omega \frac{\mu_{0}}{2\pi} \ln\left(\frac{D_{E}}{r_{s}}\right)$with earth return
Related
$D_{E}$
Equivalent depth of earth return path [m]
$\mu_{0}$
Vacuum permeability [H/m]
$\omega$
Angular frequency [rad/s]
$\pi$
Archimedes' constant $\pi$
$r_{s}$
Mean radius shield [m]
Used in
$RF$
Reduction factor
$Z_{m}$
Mutual impedance between phase conductor and metal screen with earth return [$\Omega$/m]
$Z_{s}$
Self impedance of metal screen with earth return [$\Omega$/m]