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Electrical resistance shield/armour

Equivalent electrical resistance of screen$||$sheath and armour in parallel at operating temperature.

Symbol
$R_e$
Unit
$\Omega$/m
Formulas
$R_s$without armour IEC 60287
$R_{sh}$without armour, Cigre TB 880 GP 31
$\frac{R_s R_{ar}}{R_s+R_{ar}}$with armour, IEC 60287
$\frac{R_{sh} R_{ar}}{R_{sh}+R_{ar}}$with armour, Cigre TB 880 GP 31
Related
$R_{ar}$
Electrical resistance armour [$\Omega$/m]
$R_s$
Electrical resistance shield [$\Omega$/m]
$R_{sh}$
Electrical resistance sheath [$\Omega$/m]
Used in
$\lambda_1$
Loss factor shield (screen/sheath)
$\lambda_{11}$
Loss factor shield, circulating currents
$\lambda_{12}$
Loss factor shield, eddy currents
$\lambda_2$
Loss factor armour
$m_0$
Substitution coefficient $m_0$ for eddy-currents [Hz.m/$\Omega$]
$M_e$
Substitution coefficient $M_e$ to calculate factor $F_e$
$N_e$
Substitution coefficient $N_e$ to calculate factor $F_e$
$W_{sar}$
Total loss in shield and magnetic armour (phase) [W/m]
$\xi_X$
Parameter $\xi$ calculation of loss factor