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 $1+\lambda_1+\lambda_2+\lambda_3$.

Symbol
$q_{4}$
Formulae
$\lambda_{1} + \lambda_{2} + \lambda_{3} + 1$