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Thermal resistance of insulation

Symbol
$T_i$
Unit
K.m/W
Formulae
$\frac{\rho_i}{2\pi} \ln\left(\frac{D_i}{d_c}\right)$IEC 60287
$T_{ct}+T_{cs}+T_{ins}+T_{is}$Cigre TB 880
Related
$d_c$
External diameter of conductor [mm]
$D_i$
Diameter over insulation including insulation screen [mm]
$\pi$
Archimedes' constant $\pi$
$\rho_i$
Thermal resistivity of insulation [K.m/W]
$T_{cs}$
Thermal resistance of conductor shield [K.m/W]
$T_{ct}$
Thermal resistance of conductor tape [K.m/W]
$T_{ins}$
Thermal resistance of insulation [K.m/W]
$T_{is}$
Thermal resistance of insulation screen [K.m/W]