Modelagem através do método das diferenças finitas no domínio do tempo (FDTP) de solos dispersivos utilizando aproximações de Padé validada com experimentos em campo

Abstract

The Amazonian soil of Belém is modeled as a dispersive material, of which the electrical conductivity is dependent on the frequency. For this aim, we use the Padé's approxima-tion in frequency domain, which is applied to Ampère's law. Special update equations for electric field in time domain are obtained by applying time averaging and the in-verse Fourier transform. The results obtained by numerical simulations performed with the FDTD method are compared to transient responses measured in field. Lightning-patterned pulses are injected in classical grounding systems. Excellent agreement is ob-served, which validates the developed numerical method.