Cableizer ®

Thermal resistance jacket

Symbol
$T_j$
Unit
K.m/W
Formulas
$\frac{\rho_j}{2\pi} \ln\left(\frac{D_j}{D_j-2\left(t_j+t_{jj}\right)}\right)$IEC 60287-2-1
$\frac{\rho_j}{2\pi} \ln\left(\frac{D_j-2t_{jj}}{D_j-2\left(t_j+t_{jj}\right)}\right)$CIGRE TB 880 Guidance Point 15
Related
$D_j$
Diameter over jacket [mm]
$\pi$
Archimedes' constant $\pi$
$\rho_j$
Thermal resistivity jacket material [K.m/W]
$t_j$
Thickness jacket [mm]
$t_{jj}$
Thickness of additional layer over jacket [mm]
Used in
$R_{c3}$
Thermal resistance part 3 [K.m/W]
$R_{c4}$
Thermal resistance part 4 [K.m/W]
$T_3$
Thermal resistance jacket [K.m/W]