Cableizer ®

Dielectric losses (phase)

Symbol
$W_{d}$
Unit
W/m
Formulas
$\omega C_{b} \left(1000\frac{U_{o}}{\sqrt{3}}\right)^2 \mathrm{tan} \delta_{i}$3-phase system with relative phase angle 120° or mono-phase
$\omega C_{b} \left(1000\frac{U_{o}}{2}\right)^2 \mathrm{tan} \delta_{i}$2-phase system with relative phase angle 180°
$0$DC system
Related
$C_{b}$
Capacitance insulation [F/m]
$\omega$
Angular frequency [rad/s]
$\mathrm{tan} \delta_{i}$
Loss factor insulation material
$U_{o}$
Operating voltage [kV]
Used in
$\Delta \theta_{c}$
Temperature rise conductor [K]
$\delta \theta_{c}$
Ohmic steady-state temperature rise [K]
$\Delta \theta_{d}$
Temperature rise dielectric losses [K]
$\Delta \theta_{dj}$
Temperature rise dielectric losses $\rightarrow$ cable surface [K]
$\Delta \theta_{i}$
Temperature difference insulation [K]
$g_{dry}$
Geometric constant of circle drying zone [p.u.]
$I_{c}$
Conductor current [A]
$\theta_{ar}$
Temperature armour [°C]
$\theta_{c,z}$
Temperature conductor z [°C]
$\theta_{di}$
Temperature duct inner surface [°C]
$\theta_{e}$
External temperature object [°C]
$\theta_{f}$
Temperature filler for multi-core cables type SS with sheath [°C]
$\theta_{i}$
Temperature of insulation [°C]
$\theta_{sc}$
Temperature screen [°C]
$\theta_{sh}$
Temperature sheath [°C]
$\theta_{sp}$
Temperature steel pipe [°C]
$W_{h}$
Heat generated by external object [W/m]
$W_{t}$
Total losses (phase) [W/m]