Cableizer ®

Loss factor shield, eddy currents

The loss factor of armour caused by eddy currents is calculated acc. to IEC 60287-1-1, clause 2.4.2.4, used for three-core cables with steel tape armour or reinforcement.

Symbol
$\lambda_{22}$
Formulas
$\frac{2.25{s_{c}}^2 \left(\frac{1}{1+\frac{d_{ar}}{\mu_{s} \delta_{ar}}}\right)^2 \delta_{ar}{\cdot}{10}^{-8}}{R_{c} d_{ar}} \left(\frac{f}{50}\right)^2$
Related
$d_{ar}$
Mean diameter armour [mm]
$\delta_{ar}$
Equivalent thickness of armour [mm]
$e$
Constant $e$ [m/s$^2$]
$f$
System frequency [Hz]
$\mu_{s}$
Relative permeability steel wires
$R_{c}$
Electrical resistance conductor [$\Omega$/m]
$s_{c}$
Separation of conductors in a system [mm]
Used in
$\lambda_{2}$
Loss factor armour