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Substitution coefficient $\beta_1$ for eddy-currents

Symbol
$\beta_1$
Formulae
$\sqrt{\frac{4\pi \omega}{{10}^7\rho_{sh}}}$Cables
$\sqrt{\frac{4\pi \omega}{{10}^7\rho_{encl}}}$PAC/GIL
Related
$\omega$
Angular frequency [rad/s]
$\pi$
Archimedes' constant $\pi$
$\rho_{encl}$
Specific electrical resistivity of enclosure material [$\Omega$.m]
$\rho_{sh}$
Specific electrical resistivity of sheath material [$\Omega$.m]
Used in
$g_s$
Substitution coefficient $g_s$ for eddy-currents
$\lambda_{12}$
Loss factor of shield by eddy currents