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Substitution coefficient $\Delta_1$ for eddy-currents

Symbol
$\Delta_1$
Formulae
$\left(1.14{m_0}^{2.45}+0.33\right) \left(\frac{d_e}{2s_c}\right)^{0.92m_0+1.66}$trefoil arrangement and non-flat formations
$4.7{m_0}^{0.7} \left(\frac{d_e}{2s_c}\right)^{0.16m_0+2}$flat formation, other outer phase (leading 3/T/W)
$0.86{m_0}^{3.08} \left(\frac{d_e}{2s_c}\right)^{1.4m_0+0.7}$flat formation, middle phase (1/R/U)
$\frac{-0.74\left(m_0+2\right) \sqrt{m_0}}{2+\left(m_0-0.3\right)^2} \left(\frac{d_e}{2s_c}\right)^{m_0+1}$flat formation, outer phase with greater loss (lagging 2/S/V)
Related
$d_e$
Equivalent diameter of screen/sheath and armour [mm]
$m_0$
Substitution coefficient $m_0$ for eddy-currents [Hz.m/$\Omega$]
$s_c$
Separation of conductors in a system [mm]
Used in
$\lambda_{12}$
Loss factor of shield by eddy currents