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Temperature of filler for multi-core cables type SS with sheath

With crossing heat sources, a temperature rise of $\Delta\theta_{0x}$ applies at the hottest point.

Symbol
$\theta_f$
Unit
°C
Formulae
$\theta_c-T_1 \left(W_c+\frac{W_d}{2}\right)+n_{ph} T_2 \left(W_c \left(1+\lambda_1\right)+W_d\right)$
Related
$\Delta \theta_{0x}$
Temperature rise by crossing heat sources [K]
$\lambda_1$
Loss factor of shield (screen and sheath)
$n_{ph}$
Number of phases in a cable
$T_1$
Thermal resistance between one conductor and sheath [K.m/W]
$T_2$
Thermal resistance of armour bedding [K.m/W]
$\theta_c$
Temperature of conductor [°C]
$W_c$
Conductor losses [W/m]
$W_d$
Dielectric losses [W/m]