Transient performance of horizontal grounding electrode under soil ionization effect

2017 ◽  
Author(s):  
S. Yassin ◽  
Adel Z. El Dein
Keyword(s):  
Transient Performance ◽  
Ionization Effect ◽  
Grounding Electrode ◽  
Soil Ionization

Transient lightning response to grounding grids buried in horizontal multilayered earth model considering time domain quasi-static complex image method and soil ionization effect

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Zhong-Xin Li ◽  
Peng Li ◽  
Ke-Chao Wang
Keyword(s):  
Impulse Response ◽  
Current Distribution ◽  
Time Domain ◽  
Earth Model ◽  
Content Type ◽  
Lightning Current ◽  
Ionization Effect ◽  
Lightning Impulse ◽  
Grounding Grids ◽  
Soil Ionization

Purpose The purpose of this paper is to propose a fast, accurate and efficient algorithm for assessment of transient behavior of grounding grids buried in horizontal multilayered earth model considering soil ionization effect. Design/methodology/approach The purpose of this paper is to develop a numerical simulation method to calculate the lightning impulse response of the grounding grid buried in a horizontal multilayered earth model. The mathematical model about the hybrid method based on PI basic function belonging to time domain is proposed in the paper; the mode can precisely calculate the lightning current distribution and lightning impulse response to grounding grids buried in horizontal multilayered soil model considering soil ionization effect. To increase computing efficiency, quasi-static complex image method (QSCIM) and its time-domain Green’s function closed form are introduced in the model. Findings The hybrid model is rather stable, with the respect to the number of elements used and with excellent convergence rate. In addition, because this mathematical model belongs to the time domain algorithm, it is very powerful for the simulation of soil ionization caused by high amplitude lightning current. Research limitations/implications To increase computing efficiency, QSCIM and its time domain Green's function closed form are introduced in the model. Practical implications The mathematical model about the hybrid method based on PI basic function can precisely calculate the lightning current distribution and lightning impulse response to grounding grids buried in horizontal multilayered soil model considering the soil ionization effect. Social implications Considering the soil ionization effect, the simulation calculation of lightning impulse response of substation grounding grid buried in the actual horizontal multilayered earth can effectively support the scientific and efficient design of lightning protection performance of substation grounding grid. Originality/value The hybrid model in time domain is originally developed by the authors and used to precisely calculate the lightning current distribution and lightning impulse response to grounding grids buried in horizontal multilayered soil model considering soil ionization effect. It is simple and very efficient and can easily be extended to arbitrary grounding configurations.

The Effect of Grounding Electrode Parameters on Soil Ionization and Transient Grounding Resistance Using Electromagnetic Field Approach

2014 ◽  
Vol 554 ◽  
pp. 628-632 ◽  
Author(s):  
Mehrdad Mokhatri ◽  
Zulkurnain Abdul-Malek
Keyword(s):  
Electromagnetic Field ◽  
Electric Field ◽  
Field Intensity ◽  
Electric Field Intensity ◽  
Electrode System ◽  
Grounding Resistance ◽  
Field Approach ◽  
Electrode Resistance ◽  
Grounding Electrode ◽  
Soil Ionization

The soil ionization phenomenon occurs during the dispersion of lightning current into the earth. This phenomenon causes the grounding electrode resistance to be effectively reduced. The extension of the soil ionization depends on the current amplitude along the electrode and the resultant electric field intensity surrounding the electrode. The electrical and physical parameters of the grounding electrode system are found as factors that affect the electric field intensity. In this study the electromagnetic field approach and the soil breakdown theory are taken into account to investigate the effect of the mentioned factors on soil ionization and grounding resistance. Changing the parameters of the grounding electrode system affect the electric field distribution around the electrode. Based on the conditions the grounding electrode resistance was reduced between 12% to 75% by considering the soil ionization effect.

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