Autor(es)

de Azevedo, Walter Luiz Manzi ; D'Annibale, Jose Luciano Aslan ; de Araujo, Anderson Ricardo Justo ; Pissolato Filho, Jose

• Tipo de documento: Artigo Científico
• Fonte: Electric Power Systems Research; v. 254, p. 14-pg., 2026-05-01.

Resumo

This paper provides a comprehensive analysis of the impact of corrosion effect on metallic conductors using a coated oxide layer on horizontal grounding electrodes with a focus on harmonic grounding impedance and resulting Ground Potential Rise (GPR) waveforms developed for a lightning current. Employing the full-wave electromagnetic software FEKO, based on the numerical method of Moments (MoM), simulations were conducted for electrodes ranging from 10 m to 100 m in length, buried in a soil of 100 S2 m, coated with oxide layer thicknesses of 1.0, 2.5, and 5.0 mm, and oxide resistivity of 900 S2 m. The results demonstrate that corrosion significantly alters both frequency-and time-domain responses, leading to higher low-frequency resistance and elevated GPR peaks, particularly for shorter electrodes with thicker oxide layers. The impulse impedance decreases with increasing electrode length and increases with oxide layer thickness. These results demonstrate the necessity of accurately modeling corroded conductors in grounding system analyses. Additionally, the validated full-wave simulation topology can be employed to obtain the harmonic impedance, which can be incorporated into Electromagnetic Transient (EMT)-type programs, thereby improving the reliability of lightning performance assessments in power systems. (AU)

• Processo FAPESP: 21/11258-5 - Centro de Pesquisa em Engenharia para a Mobilidade Aérea do Futuro (CPE-MAF)
• Beneficiário: Domingos Alves Rade
• Modalidade de apoio: Auxílio à Pesquisa - Programa Centros de Pesquisa Aplicada
• Processo FAPESP: 19/01396-1 - Representação de torres convencionais e elevadas de linhas de transmissão diretamente no domínio do tempo para análises de transitórios eletromagnéticos
• Beneficiário: Anderson Ricardo Justo de Araújo
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado