Cableizer ®

Temperature rise dielectric losses $\rightarrow$ cable surface

$\Delta\theta_dj$ is a factor having the dimensions of temperature difference, accounts for dielectric losses. It is not used in our calculations but used in CIGRE TB 880.

Symbol
$\Delta \theta_{dj}$
Unit
K
Formulas
$W_{d} \left(\left(\frac{1}{1+\lambda_{1}+\lambda_{2}}-\frac{1}{2}\right) T_{1}-\frac{n_{ph} \lambda_{2} T_{2}}{1+\lambda_{1}+\lambda_{2}}\right)$
Related
$\lambda_{1}$
Loss factor shield (screen/sheath)
$\lambda_{2}$
Loss factor armour
$n_{ph}$
Number of phases in a cable
$T_{1}$
Thermal resistance conductor—sheath [K.m/W]
$T_{2}$
Thermal resistance armour bedding [K.m/W]
$W_{d}$
Dielectric losses (phase) [W/m]