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]