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Thermal capacitance conductor transient (IEC 60853)

The capacitance of the equivalent conductor for multi-core cables is equal to the sum of the capacitances of the conductors plus the capacitance of that portion of the insulation which is enclosed within the perimeter of the equivalent conductor.

Symbol
$Q_{c,t}$
Unit
J/(m.K)
Formulas
$Q_c$cables, round conductors
$Q_c+\frac{\sigma_i n_c d_c t_{i1}}{{10}^6}$multi-core cables, sector-shaped conductors
Related
$d_c$
External diameter conductor [mm]
$n_c$
Number of conductors cable
$Q_c$
Thermal capacitance conductor [J/(m.K)]
$\sigma_i$
Volumetric heat capacity insulation material [J/(K.m$^3$)]
$t_{i1}$
Thickness of insulation between conductors [mm]
Used in
$Q_A$
Thermal capacitance A transient thermal circuit [J/(m.K)]
$Q_{tot}$
Thermal capacitance, transient [J/(m.K)]