Loss factor of shield (screen and sheath)

The power loss in the sheath or screen ($\lambda_1$) consists of losses caused by circulating currents ($\lambda_{11}$) and eddy currents ($\lambda_{12}$), thus $\lambda_1=\lambda_{11}+\lambda_{12}$.

Special cases are:

Symbol
$\lambda_1$
Formulae
$\lambda_{11}+\lambda_{12}$General case
$\frac{R_e}{R_c}$single-core concentric cable
$\frac{R_{encl}}{R_c}$single-core concentric PAC/GIL