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Parameter m armour

Definition according to Cigre TB 531 chap. 4.2.1

Symbol
$m_{z,ar}$
Formulas
$\sqrt{\frac{\omega \mu_0}{\rho_{ar}}}$armour
$\sqrt{\frac{j Romega \mu_0}{\rho_{sp}}}$steel pipe
Related
$\mu_0$
Vacuum permeability [H/m]
$\omega$
Angular frequency [rad/s]
$\rho_{ar}$
Specific electrical resistivity armour material [$\Omega$.m]
$\rho_{sp}$
Specific electrical resistivity steel pipe material [$\Omega$.m]
Used in
$\mathscr{z}_{pin}$
Impedance armour inner surface [$\Omega$/m]
$\mathscr{z}_{pmut}$
Mutual impedance armour [$\Omega$/m]
$\mathscr{z}_{pout}$
Impedance armour outer surface [$\Omega$/m]