Cableizer ®

Electrical resistance armour

Electrical resistance of armour at operating temperature.

Symbol
$R_{ar}$
Unit
$\Omega$/m
Formulas
${10}^6\frac{\rho_{ar}}{A_{ar}}$at 20°C, IEC 60287-1-1
${10}^6\frac{f_{ar} \rho_{ar}}{A_{ar}}$at 20°C, IEC 60287-1-1, CIGRE TB 880 Guidance Point 34
$F_{lay,ar} R_{ar}$CIGRE TB 880 Guidance Point 32, at 20°C
$R_{ar} \left(1+\alpha_{ar} \left(\theta_{ar}-20\right)\right)$at operating temperature DC
Related
$A_{ar}$
Cross-sectional area armour [mm$^2$]
$\alpha_{ar}$
Temperature coefficient armour material [1/K]
$f_{ar}$
Factor between AC and DC resistance armour [$\Omega$/m]
$F_{lay,ar}$
Effective length per unit lay length armour
$\rho_{ar}$
Specific electrical resistivity armour material [$\Omega$.m]
$\theta_{ar}$
Temperature armour [°C]
Used in
$I_{ar}$
Induced circulating current armour [A]
$\lambda_2$
Loss factor armour
$\lambda_{21}$
Loss factor armour, circulating currents
$R_e$
Electrical resistance shield/armour [$\Omega$/m]