Cableizer ®

Thermal resistance sheath jacket

Thermal resistance of the jacket around each core of three-core subsea cables. The thermal resistance of the sheath jacket is considered per phase, same as the thermal resistance of the insulation.

Symbol
$T_{shj}$
Unit
K.m/W
Formulas
$\frac{\rho_{shj}}{2\pi} \ln\left(\frac{D_{shj}}{D_{sh}-\left(H_{sh}+\Delta H\right)}\right)$per core
$F_{lay,3c} T_{shj}$CIGRE TB 880 Guidance Point 44, compensated for the lay length
Related
$D_{sh}$
Diameter over sheath [mm]
$D_{shj}$
Diameter over sheath jacket [mm]
$\Delta H$
Correction depth of corrugation [mm]
$F_{lay,3c}$
Effective length per unit lay length twisted conductors
$H_{sh}$
Depth of corrugation [mm]
$\pi$
Archimedes' constant $\pi$
$\rho_{shj}$
Thermal resistivity sheath jacket material [K.m/W]
Used in
$R_{c2}$
Thermal resistance part 2 [K.m/W]
$R_{c3}$
Thermal resistance part 3 [K.m/W]