Cableizer ®

Thermal resistance, total

Total thermal resistance per conductor.

Symbol
$T_{r}$
Unit
K.m/W
Formulas
$T_{1}+n_{c} \left(T_{2}+T_{3}\right)+n_{cc} \left(T_{4i}+T_{4ii}+v_{4} T_{4\mu}\right)$cable
$T_{1}+n_{c} T_{prot}+n_{cc} \left(T_{4i}+T_{4ii}+v_{4} T_{4\mu}\right)$PAC/GIL
$T_{hs}+T_{4iii}$heat source
$T_{fo}+T_{4iii}$fiber optic cable
Related
$n_{c}$
Number of conductors cable
$n_{cc}$
Number of conductors combined
$T_{1}$
Thermal resistance conductor—sheath [K.m/W]
$T_{2}$
Thermal resistance armour bedding [K.m/W]
$T_{3}$
Thermal resistance jacket [K.m/W]
$T_{4i}$
Thermal resistance medium in the duct [K.m/W]
$T_{4ii}$
Thermal resistance duct wall [K.m/W]
$T_{4iii}$
Thermal resistance ambient [K.m/W]
$T_{4\mu}$
Thermal resistance ambient [K.m/W]
$T_{fo}$
Thermal resistance FOC [K.m/W]
$T_{hs}$
Thermal resistance heat source [K.m/W]
$T_{prot}$
Thermal resistance protective cover [K.m/W]
$v_{4}$
Ratio thermal resistivity dry/moist soil
Used in
$\gamma_{X}$
Attenuation factor for crossing [1/m]