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Electrical thickness of insulation material

Symbol
$\delta_i$
Unit
m
Formulae
$\frac{\frac{\alpha_i \Delta \theta_i}{\ln\left(\frac{r_{osc}}{r_{isc}}\right)}+\frac{\gamma_i U_o}{r_{osc}-r_{isc}}}{1+\frac{\gamma_i U_o}{r_{osc}-r_{isc}}}$
Related
$\alpha_i$
Temperature coefficient of conductivity of insulation material [1/K]
$\Delta \theta_i$
Temperature difference across insulation [K]
$\gamma_i$
Electrical field coefficient of 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$^3$]
$E_i$
Electrical field strength [kV/mm]
$\lambda_i$
Parameter $\lambda$ for linear density of dielectric losses
$w_d$
Volumetric density of dielectric losses [W/m$^3$]