Self impedance of earth continuity conductor

Definition according to Cigré guide 531 chapter 4.2.3.9

Symbol

$Z_{ct}$

Unit

$\Omega$/m

Formulae

$R_E+R_{ct}+j \omega \frac{\mu_0}{2\pi} \ln\left(\frac{D_E}{r_g}\right)$

Related

$D_E$

Equivalent depth of earth return path [m]

$\mu_0$

Vacuum permeability [H/m]

$\omega$

Angular frequency [rad/s]

$\pi$

Archimedes' constant $\pi$

$R_{ct}$

Resistance of earth continuity conductor [$\Omega$/m]

$R_E$

Equivalent resistance of earth return path [$\Omega$/m]

$r_g$

Geometric mean radius of the ground conductor [m]

Used in

$Z_h$

Zero-sequence impedance [$\Omega$/m]