Experimental Investigation of Transient Grounding Resistance Characteristics on a Spokewise Grounding Electrode

2007 ◽  
Author(s):  
Chen Jiaqing ◽  
Zhou Bihua ◽  
He Hongbing ◽  
Meng Xin ◽  
Huang Xiaofang
Keyword(s):  
Experimental Investigation ◽  
Grounding Resistance ◽  
Grounding Electrode

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.

scholarly journals A new grounding model for complex soil environments

2019 ◽  
Vol 118 ◽  
pp. 03001
Author(s):  
Chong Pan ◽  
Dong Zhao ◽  
Xuesong Tu ◽  
Shuqin Wang ◽  
Tie Liu ◽  
...  
Keyword(s):  
Surface Potential ◽  
Transmission Lines ◽  
Normal Operation ◽  
Long Distance ◽  
Grounding System ◽  
Grounding Resistance ◽  
Resistance Surface ◽  
Resistance Reduction ◽  
The Common ◽  
Grounding Electrode

The purpose of arranging the grounding electrode is to discharge large currents, such as fault current and ensure the transmission line operate safely. In the grounding system of Chinese transmission network, the common grounding electrodes are horizontal installation and vertical installation. But two installation methods usually have the disadvantages, which are long distance installation and large depth burying, and they are restricted susceptible to uncertain factors such as pipelines, roads and geology, which leads the grounding resistance increasing and affect the normal operation of transmission lines. In order to solve the problem, this paper presents a new grounding model for complex soil environments and analysis from grounding resistance, surface potential and current distribution. The results show that the helix grounding electrode has good resistance reduction performance in complex soil environment, which effectively improves the surface potential distribution and the distribution of the spill current.

scholarly journals Helix grounding electrode with good grounding performance

2019 ◽  
Vol 277 ◽  
pp. 03007 ◽  
Author(s):  
Zhanlong Zhang ◽  
Yihua Dan ◽  
Daojun Mei ◽  
Jing Zou ◽  
Peiyu Jiang
Keyword(s):  
Surface Potential ◽  
Surface Current ◽  
Current Density Distribution ◽  
Electrical Equipment ◽  
Installation Space ◽  
Stable Operation ◽  
Surface Current Density ◽  
Grounding Resistance ◽  
Step Voltage ◽  
Grounding Electrode

Grounding electrode is used for discharging current and ensure the safe and stable operation of electrical equipment. Grounding performance of grounding electrode will degradation with limited installation space. This paper proposes helix grounding electrode and builds theoretically and simulating model on the helix grounding electrode. Analyzing grounding surface potential and step voltage distribution, grounding resistance and surface current density distribution. Results show helix grounding electrode can reduce grounding resistance, improve grounding surface potential distribution and the discharging current distribution.

scholarly journals Analysis of the effect of explosion grounding electrode on grounding resistance reduction

2019 ◽  
Vol 2019 (16) ◽  
pp. 3251-3254
Author(s):  
Yongli Wang ◽  
Sen Wang ◽  
Jian Zhang ◽  
Zhizhong Li ◽  
Li Xu
Keyword(s):  
Grounding Resistance ◽  
Resistance Reduction ◽  
Grounding Electrode

scholarly journals Novel Grounding Electrode Model with Axial Construction Space Consideration

Energies ◽  
2019 ◽  
Vol 12 (24) ◽  
pp. 4765
Author(s):  
Yihua Dan ◽  
Zhanlong Zhang ◽  
Yiqiao Li ◽  
Jun Deng ◽  
Jing Zou
Keyword(s):  
Structural Parameters ◽  
Electrical Potential ◽  
Calculation Model ◽  
Maintenance Cost ◽  
Grounding Resistance ◽  
Additional Resistance ◽  
Grounding Electrode ◽  
Touch Voltage ◽  
Operation And Maintenance Cost ◽  
Electrical Apparatus

Grounding electrodes are used to ensure safe operation of electrical apparatus. The limited axial construction space for grounding electrodes is a significant constraining factor. Grounding performance will attenuate rapidly under the influence of the reduced length of horizontal or vertical grounding electrodes. However, if additional resistance-reducing measures are adopted, the operation and maintenance cost of grounding electrodes will considerably increase. To solve above problem, this study proposed a novel grounding model that uses a helical grounding electrode to improve grounding performance within limited axial construction space. Firstly, a calculation model of finite element methods (FEM) is built based on the concept of increasing the contact area between the grounding electrodes and the soil. Grounding performance parameters of helical grounding electrodes, grounding resistance, electrical potential rise (EPR) distribution and maximum touch voltage, are analyzed. At the same time, structural parameters and buried depth for the helical grounding electrodes are studied and the optimal design criteria for the parameters are given. Results show that the helical grounding electrode exhibits better grounding performance in a limited axial construction area.

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