Cableizer ®

Impedance sheath inner surface

Definition according to CIGRE TB 531 chap. 4.2.2.5 composite screen and sheath ($z_7$)

Symbol
$\mathcal{Z}_{3,sh}$
Unit
$\Omega$/m
Formulas
$\frac{m_{z,sh} \rho_{sh}}{2\pi r_{z2,sh}} \operatorname{coth}\left(m_{z,sh} \left(r_{z3,sh}-r_{z2,sh}\right)\right)-\frac{\rho_{sh}}{2\pi r_{z2,sh} \left(r_{z2,sh}+r_{z3,sh}\right)}$
Related
$m_{z,sh}$
Parameter m sheath
$\pi$
Archimedes' constant $\pi$
$r_{z2,sh}$
Radius sheath (inner) [m]
$r_{z3,sh}$
Radius sheath (outer) [m]
$\rho_{sh}$
Specific electrical resistivity sheath material [$\Omega$.m]
Used in
$\mathcal{Z}_3$
Impedance shield inner surface [$\Omega$/m]
$\mathcal{Z}_4$
Mutual impedance shield [$\Omega$/m]
$\mathcal{Z}_5$
Impedance shield outer surface [$\Omega$/m]