Abstract
This paper presents an analysis of soil frequency dependence
effect on input impedance of grounding system. It focuses on
vertical grounding electrodes buried in multilayer soil structure.
The proposed analytical formulae obtained from experimental
results is used to predict the frequency dependence impacts of
multilayer soil electrical parameters.To this aim, the precise
full-wave method based upon the method of moment (MoM) is
employed. The input impedance is calculated for different soil
conditions described by the top layer height and the electrical
parameters of soil for all layers. The contributions of this
paper are: 1) considering frequency dependent of multilayer
soil; 2) using the MoM-based approach, which is accurate
and less time consuming, to evaluate transient behavior of
grounding system. The effect of frequency dependence is
more demonstrated for input impedance of electrodes that are
buried in high resistivity soils in opposition with those buried
in low resistivity soils and especially when these systems
are subjected to high-frequency contents of lightning. These
findings demonstrate that the frequency content of the impulse
current, the soil electrical parameters and the grounding
electrode length are the main factors affecting the lightning
performance of grounding systems.
effect on input impedance of grounding system. It focuses on
vertical grounding electrodes buried in multilayer soil structure.
The proposed analytical formulae obtained from experimental
results is used to predict the frequency dependence impacts of
multilayer soil electrical parameters.To this aim, the precise
full-wave method based upon the method of moment (MoM) is
employed. The input impedance is calculated for different soil
conditions described by the top layer height and the electrical
parameters of soil for all layers. The contributions of this
paper are: 1) considering frequency dependent of multilayer
soil; 2) using the MoM-based approach, which is accurate
and less time consuming, to evaluate transient behavior of
grounding system. The effect of frequency dependence is
more demonstrated for input impedance of electrodes that are
buried in high resistivity soils in opposition with those buried
in low resistivity soils and especially when these systems
are subjected to high-frequency contents of lightning. These
findings demonstrate that the frequency content of the impulse
current, the soil electrical parameters and the grounding
electrode length are the main factors affecting the lightning
performance of grounding systems.
| Original language | English |
|---|---|
| Publication date | 2020 |
| Number of pages | 8 |
| Publication status | Published - 2020 |
| Event | Proceedings of the 16th IET International Conference on AC and DC Power Transmission (ACDC 2020): ACDC 2020 - China, China Duration: 2 Jul 2020 → 4 Jul 2020 Conference number: 7 |
Conference
| Conference | Proceedings of the 16th IET International Conference on AC and DC Power Transmission (ACDC 2020) |
|---|---|
| Number | 7 |
| Location | China |
| Country/Territory | China |
| Period | 02/07/2020 → 04/07/2020 |
Keywords
- Frequency dependence
- Method of moment
- Multi-layered soil
- Grounding system
- Input impedance