Impact of Frequency-Dependent Soil on Transient Ground Potential Rise of Counterpoise Electrodes

Author(s)

de Araujo, Anderson R. J. ; da Silva, Wagner C. ; Pissolato Filho, Jose ; Tsuzuki, MDG ; Pessoa, MAD

• Document type: Journal article
• Source: 2021 14TH IEEE INTERNATIONAL CONFERENCE ON INDUSTRY APPLICATIONS (INDUSCON); v. N/A, p. 2-pg., 2021-01-01.

Abstract

Tower-footing grounding impedance has a fundamental impact on the generated overvoltages in power system when a transmission tower is hit by lightning. In order to compute accurately the tower-footing grounding impedance, the frequency dependence of soil electrical parameters (resistivity rho(g) and relative permittivity epsilon(r)) must be considered in the simulations. In this paper, a comparative analysis on the transient Ground Potential Rise (GPR) generated by a lightning subsequent return stroke buried into the frequency-independent (FI) and frequency-dependent (FD) soils is carried out. Results show a significant reduction in the voltage peaks of the generated GPR waveforms when a FD soil model is assumed for the simulations. (AU)

• FAPESP's process: 19/01396-1 - Modelling conventional and tall transmission towers directly in time domain for electromagnetic transient analysis
• Grantee: Anderson Ricardo Justo de Araújo
• Support Opportunities: Scholarships in Brazil - Post-Doctoral