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Dielectric losses

Symbol
$W_d$
Unit
W/m
Formulae
$\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 of insulation [F/m]
$\omega$
Angular frequency [rad/s]
$\mathrm{tan} \delta_i$
Loss factor of insulation
$U_o$
Operating voltage [kV]
Used in
$\Delta \theta_c$
Temperature rise of conductor [K]
$\delta \theta_c$
Ohmic steady-state temperature rise [K]
$\Delta \theta_d$
Temperature rise by dielectric losses [K]
$\Delta \theta_i$
Temperature difference across insulation [K]
$g_{dry}$
Geometric constant of circle with dried-out soil [p.u.]
$I_c$
Conductor current [A]
$\theta_{ar}$
Temperature of armour [°C]
$\theta_{c,z}$
Conductor temperature at z [°C]
$\theta_{di}$
Temperature of duct inner wall [°C]
$\theta_e$
External temperature of the object [°C]
$\theta_f$
Temperature of filler for multi-core cables type SS with sheath [°C]
$\theta_i$
Temperature of insulation [°C]
$\theta_s$
Temperature of screen/sheath [°C]
$\theta_{sc}$
Temperature of screen [°C]
$\theta_{sh}$
Temperature of sheath [°C]
$\theta_{sp}$
Temperature of steel pipe [°C]
$W_h$
Heat generated by external object [W/m]
$W_t$
Total losses per phase [W/m]