Internal thermal resistance for current losses

Symbol
$T_{int}$
Unit
K.m/W
Formulae
$\frac{T_{1}}{n_{c}} + T_{2} \left(\lambda_{1} + 1\right) + T_{3} \left(\lambda_{1} + \lambda_{2} + 1\right)$AC cables
$\frac{T_{1}}{n_{c}} + T_{2} + T_{3}$DC cables up to 5 kV, not concentric
$\frac{T_{1}}{n_{c}} + T_{prot} \left(\lambda_{1} + 1\right)$GIL
$\frac{T_{1}}{n_{c}} + T_{2} \left(\lambda_{1} + 1\right)$Cables subsea
$0.388888888888889 T_{1}$Three-core cables in riser (Hartlein & Black)
Used in
$\Delta \theta_{c}$