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This 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.
Marcos Rubinstein, Hamidreza Karami, Rafael Silva Alipio
Pierluigi Bruzzone, Kamil Sedlák, Federica Demattè, Chiara Frittitta
Farhad Rachidi-Haeri, Rafael Silva Alipio