De Conti, AlbertoDuarte, NaiaraAlipio, RafaelLeal, Osis E. S.2023-05-082023-05-082023-05-082023-03-2310.1016/j.epsr.2023.109299https://infoscience.epfl.ch/handle/20.500.14299/197404WOS:000961517700001This paper proposes small-argument approximations for two closed-form equations that were recently derived for the calculation of the ground-return impedance and admittance of underground cables. The proposed expressions are shown to be accurate up to 1 MHz for a typical cable configuration and frequency-dependent ground parameters. Their accuracy is also demonstrated in the calculation of transients on underground cables taking as reference results obtained with more general formulations.Engineering, Electrical & ElectronicEngineeringelectromagnetic transientsanalytical expressionsground-return admittanceground-return impedanceunderground cableselectrical parameterstransienttext::journal::journal article::research article