Cableizer ®

Electrical thickness of insulation material

Symbol
$\delta_{i}$
Unit
m
Formulas
$\frac{\frac{\alpha_{i} \Delta \theta_{i}}{\ln\left(\frac{r_{osc}}{r_{isc}}\right)}+\frac{\gamma_{i} U_{o}}{r_{osc}-r_{isc}}}{1+\frac{\gamma_{i} U_{o}}{r_{osc}-r_{isc}}}$
Related
$\alpha_{i}$
Temperature coefficient of conductivity insulation material [1/K]
$\Delta \theta_{i}$
Temperature difference insulation [K]
$\gamma_{i}$
Electrical field coefficient insulation material [mm/kV]
$r_{isc}$
Radius above the inner semi-conducting layer [mm]
$r_{osc}$
Radius over capacitive insulation layers [mm]
$U_{o}$
Operating voltage [kV]
Used in
$\Delta w_{d}$
Increment of volumetric density of dielectric losses in HVDC cables [W/m$^3$]
$E_{Fi}$
Electrical field strength [kV/mm]
$\lambda_{i}$
Parameter $\lambda$ for linear density of dielectric losses
$w_{d}$
Volumetric density of dielectric losses [W/m$^3$]