Transient Analysis of Grounding Electrodes in Multilayer Soils Using Method of Moments

Grounding electrodes are expected to provide a low-impedance path for faults and lightning transient currents and protect the safety of electrical equipment and nearby people against dangerous induced potentials. In this context, a precise model of the grounding electrodes is needed to represent a c...

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Bibliographic Details
Published in:Revista IEEE América Latina 2022-02, Vol.20 (2), p.269-275
Main Authors: de Araujo, Anderson Ricardo Justo, Colqui, Jaimis Sajid Leon, Azevedo, Walter Luiz Manzi de, Kurokawa, Sergio, Filho, Jose Pissolato, Kordi, Behzad
Format: Article
Language:English
Subjects:
Computational modeling
Electric equipment
Electrical grounding
Electrical resistivity
Electrodes
Electromagnetic transients
Frequency ranges
Grounding
grounding electrodes
Impedance
Lightning
Method of moments
Multilayers
Numerical methods
Return strokes (lightning)
Software
Soil
Soil layers
Soils
Transient analysis
Transient current
Waveforms
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Summary:Grounding electrodes are expected to provide a low-impedance path for faults and lightning transient currents and protect the safety of electrical equipment and nearby people against dangerous induced potentials. In this context, a precise model of the grounding electrodes is needed to represent a certain electrode arrangement buried in stratified soil. This paper computes the grounding impedances of different grounding systems buried in three different soil configurations (homogeneous, 2-layer and 3-layer soil) modeled by its frequency-dependent electrical parameters. A simulation model using a commercial full-wave electromagnetic software FEKO to compute the grounding impedances is presented. Method of Moments(MoM), a frequency-domain numerical method, is employed to compute the grounding impedance in a frequency range of100 Hz to 5 MHz. Next, the developed ground potential rise(GPR) generated by two types of lightning currents (first and subsequent return strokes) injected into these grounding systems is computed. Time-domain GPR of each grounding system is also determined using the Vector Fitting (VF) technique combined with the ATP-software. Results show that GPR waveform is reduced when frequency-dependent soils are employed. This reduction is more pronounced in homogeneous and in 2-layersoils of high and moderated resistivity whereas the 3-layer soil has a minor impact due to the lower soil resistivity
ISSN:1548-0992
1548-0992
DOI:10.1109/TLA.2022.9661466