De Conti, AlbertoDuarte, NaiaraAlipio, Rafael2023-08-282023-08-282023-08-282023-08-0110.1109/TPWRD.2023.3264614https://infoscience.epfl.ch/handle/20.500.14299/200150WOS:001038260400057This paper proposes closed-form expressions for the calculation of the ground-return impedance and admittance of underground cables. The proposed expressions are shown to reproduce the integral equations of Xue with great accuracy for a wide range of ground resistivities and frequencies. An error analysis, a comparison with closed-form expressions available in the literature, and time-domain simulations demonstrate the performance of the proposed equations, which avoid the calculation of improper integrals and present an accurate performance for typical cable arrangements.Engineering, Electrical & ElectronicEngineeringunderground cablestransmission line theoryground-return impedanceground-return admittancewave-propagationtransient analysisapproximationplanewiresmodeltext::journal::journal article::research article