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Ratio of losses affecting environment

Ratio of current-dependent losses in conductor, screen/sheath, armour and pipe to losses in conductor. Voltage-dependent losses (dielectric losses) are not included in this ratio.

The ratio corresponds to $1+\lambda_1+\lambda_2+\lambda_3+\lambda_4$.

Symbol
$q_4$
Formulae
$1+\lambda_1+\lambda_2+\lambda_3+\lambda_4$
Related
$\lambda_1$
Loss factor of shield (screen and sheath)
$\lambda_2$
Loss factor of armour
$\lambda_3$
Loss factor of steel pipes for pipe-type cables
$\lambda_4$
Loss factor of magnetic steel ducts
Used in
$Q_{B,d}$
Element B of two-part thermal circuit, duct [J/(m.K)]
$T_B$
Element B of equivalent thermal circuit [K.m/W]
$T_C$
Element C of equivalent thermal circuit [K.m/W]