Computation of ground potential rise and grounding impedance of simple arrangement of electrodes buried in frequency-dependent stratified soil
| Autor: | Bamdad Salarieh, Sérgio Kurokawa, Jose Pissolato Filho, Claudiner Mendes de Seixas, Jaimis S. L. Colqui, Behzad Kordi, Anderson Ricardo Justo de Araújo |
|---|---|
| Přispěvatelé: | Universidade Estadual de Campinas (UNICAMP), Universidade Estadual Paulista (UNESP), Federal Institute of São Paulo-IFSP, University of Manitoba |
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Grounding impedance
Stratified soil Materials science 020209 energy 020208 electrical & electronic engineering Energy Engineering and Power Technology Relative permittivity 02 engineering and technology Mechanics Electromagnetic transients Dissipation Fault (power engineering) Earthing system Lightning Electrical resistivity and conductivity 0202 electrical engineering electronic engineering information engineering Equivalent circuit Transient (oscillation) Electrical and Electronic Engineering Frequency-dependent soil |
| Zdroj: | Scopus Repositório Institucional da UNESP Universidade Estadual Paulista (UNESP) instacron:UNESP |
| Popis: | Made available in DSpace on 2022-05-01T04:26:38Z (GMT). No. of bitstreams: 0 Previous issue date: 2021-09-01 Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) Grounding electrodes are used to provide a low-impedance dissipation path for the excess lightning or fault currents. Several studies have been dedicated to the computation of the grounding impedance of different electrode arrangements considering either the frequency dependence of soil parameters (resistivity ρ and relative permittivity εr) or the multi-layer nature of soil. This paper aims at the calculation of the grounding impedance and the ground potential rise (GPR) of simple electrode arrangements (vertical and cross electrodes) due to the injection of first and subsequent lightning currents in various configurations of soil, considering a frequency-dependent stratified soil. A frequency-domain full-wave electromagnetic solver based on the Method of Moment (MoM) that employs a stratified medium Green's function is used to compute the grounding impedance in a frequency range of 100Hz to 10MHz. The transient GPRs are computed using the equivalent circuit of the grounding system, obtained through the application of the Vector Fitting (VF) technique and recursive convolution method. The simulation results show that considering the frequency dependence of the soil parameters has no effect on the low-frequency grounding impedance up to ≈10kHz. However, the frequency dependence of soil parameters leads to a considerable variation of the grounding impedance at higher frequencies especially for soils of higher resistivity. Furthermore, it is shown that considering the layers of soil has a more significant impact on the GPR of the vertical electrode than that of the cross electrode. University of Campinas São Paulo State University Federal Institute of São Paulo-IFSP University of Manitoba São Paulo State University FAPESP: 2019/01396-1 |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|