Cableizer ®

Thermal resistance armour bedding 1

Cable with double layer armour applying CIGRE TB 880 Guidance Point 15

Symbol
$T_{ab,1}$
Unit
K.m/W
Formulas
$\frac{\rho_{ab,1}}{2\pi} \ln\left(\frac{D_{ab,1}}{F_x D_{shj}}\right)$multi-core cables type SS
$\frac{\rho_{ab,1}}{2\pi} \ln\left(\frac{D_{ab,1}}{D_{shj}-\left(H_{sh}+\Delta H\right)}\right)$otherwise
Related
$D_{ab,1}$
Diameter over armour bedding 1 [mm]
$D_{shj}$
Diameter over sheath jacket [mm]
$\Delta H$
Correction depth of corrugation [mm]
$F_x$
Geometrical distance factor for multi-core cables
$H_{sh}$
Depth of corrugation [mm]
$\pi$
Archimedes' constant $\pi$
$\rho_{ab,1}$
Thermal resistivity armour bedding 1 [K.m/W]
Used in
$T_{ab}$
Thermal resistance armour bedding [K.m/W]