Publication
This paper revisits the topic of induced voltages and currents in underground cables, building on recent advancements in both cable coupling and soil modeling. The induced current in an underground cable is computed by solving the field-to-buried cable coupling equations in the frequency domain using Green’s functions. The results obtained reinforce the importance of including the ground admittance in addressing transient problems in underground cables, especially in poor conducting soils. Comparative analysis reveals that combining Sunde's ground-return impedance formulation with Vance's approximation for computing the ground-return admittance aligns closely with results obtained using the more complete formulation of Xue et al., offering a simplified yet accurate method for calculating induced currents and voltages in buried cables. Also, it is demonstrated that the frequency dependence of soil’s electrical parameters significantly im-pacts the induced current in the cable, leading to a decrease in its amplitude, notably in poor conducting soils. The findings of this study underline the importance of a detailed ground-return parameter computation and the inclusion of soil param-eter frequency dependence for the accurate assessment of induced effects in underground cables.