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
$q_{\mathrm{4}}$
Formulae
$\lambda_{\mathrm{1}} + \lambda_{\mathrm{2}} + \lambda_{\mathrm{3}} + 1$
Related
$\lambda_{\mathrm{1}}$
$\lambda_{\mathrm{2}}$
$\lambda_{\mathrm{3}}$
Used in
$Q_{\mathrm{B_{\mathrm{d}}}}$