Ratio of losses affecting the filler

Ratio of losses in conductor and screen/sheath to losses in conductor affecting the filler of multi-core cables.

Symbol
$q_{f}$
Formulae
$\lambda_{1} + 1$separate screen / separate sheaths (Type SS)
$\frac{\lambda_{1}}{2} + 1$separate screen / common sheath (Type SC)
$1$common screen / common sheath (Type CC)