Results 251 to 260 of about 36,031 (286)

Calculation of Impulse Grounding Resistance of Extended Grounding Electrode

2013
In order to calculate the impulse grounding resistance of extended grounding electrode accurately, this paper introduces a method for computing the impulse grounding resistance based on the spark discharge characteristic of the earth, using a nonlinear differential circuit model. The relation curves of impulse grounding resistance with the current peak
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Impulse coefficient for square grounding grids in low resistivity soils: Influence of injection electrode

Journal of Electrostatics, 2014
Abstract Impulse coefficient is calculated, for the first time, by considering the response of the current injection electrode connected to ground grids for lightning subsequent return strokes. It is observed that the impulse coefficient can be substantially amplified specially for low resistivity soils (e.g.
Rodrigo M.S. de Oliveira, Jonathas F.M. Modesto, Marcos Rodrigo V. Maia, Daiyuki Maia Fujiyoshi, Adroaldo Raizer   +4 more
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A methodology for determining the maximum touch voltage in the grounding grids considering the impulse resistance

2016 19th International Symposium on Electrical Apparatus and Technologies (SIELA), 2016
The flow of the lightning current through the grounding grids of electrical substations produces impulse processes in the soil. The authors have developed a simulation model of the grounding, considering the wave processes. To expand the model, determination of the maximum possible touch voltage in these processes have to be done.
Yordanova, Marinela, Vasileva, Margreta, Dimitrova, Rositsa, Ivanova, Milena   +3 more
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Modeling Research on Time-Varying Impulse Resistance of Grounding Grid

2018
The behavior of grounding systems excited by high-current show great differs from that at low-frequency and low-current. Simulation of high-current draining to earth require accurate modeling of tower grounding system. The current model cannot meet this requirement.
Wang Tao, Hu Xianzhe, Li Yangping, Wang Qi   +3 more
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An original setup to measure grounding resistances using fast impulse currents and very short leads

Electric Power Systems Research, 2019
Abstract This paper presents a method for measuring grounding resistances, which is based on the use of fast impulse current and short leads on the auxiliary measurement circuits. Usually, the conductor length of the voltage and current circuits used in grounding resistance measurements may be quite long depending on the grounding characteristics ...
A.B. Lima, C.E.F. Caetano, J.O.S. Paulino, W.C. Boaventura, I.J.S. Lopes, C.F. Barbosa   +5 more
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Impulse characteristics of grounding systems of transmission-line towers in the regions with high soil resistivity

POWERCON '98. 1998 International Conference on Power System Technology. Proceedings (Cat. No.98EX151), 2002
The lightning protection effects of power transmission lines are related to the impulse characteristics of grounding systems of transmission-line towers. The influences of several main factors on impulse grounding properties are systematically analyzed by simulation experiments according to the simulation theory in this study.
null He Jinliang, null Zeng Rong, null Chen Shuiming, null Li Siyun, null Wu Weihan   +4 more
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Development of weatherproof mobile impulse voltage generator and its application to experiments on nonlinearity of grounding resistance

Electrical Engineering in Japan, 1996
AbstractThis paper describes a newly developed impulse voltage generator (IG). It has the following features: (1) The IG consists of three components (a 1.6 MV unit, a 1.4‐MV unit and a base box); this facilitates mounting on 10‐ton trucks, therefore making it easier to move to a test field.
Atsuo Morimoto, Hiroshi Hayashida, Shozo Sekioka, Masahiko Isokawa, Tatsuya Hiyama, Hitoshi Mori   +5 more
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A simplified method for calculating the impulse resistance of vertical grounding rods

2002 IEEE Region 10 Conference on Computers, Communications, Control and Power Engineering. TENCOM '02. Proceedings., 2003
A simplified method is proposed for calculating the impulse resistance of vertical grounding rods. The analytic formula is first derived to determine the low current resistance and then the calculation procedure is developed to estimate the impulse resistance.
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Deviation Analysis of Impulse Grounding Resistance Based on Impulse Coefficient

2023 International Conference on Power Energy Systems and Applications (ICoPESA), 2023
Hongtao Ren, Ying Zhang
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Crest ground resistance of a HV tower: practical measurement with a portable impulse generator of a few amps

2000 IEEE ESMO - 2000 IEEE 9th International Conference on Transmission and Distribution Construction, Operation and Live-Line Maintenance Proceedings. ESMO 2000 Proceedings. Global ESMO 2000. The Power is in Your Hands (Cat. No.00CH37183), 2002
Lightning strikes may cause a rise in transmission tower potential which could produce a tower-to-phase flashover. This paper presents a computer-modeled technique applied to study this phenomena. 120 kV and 315 kV power lines have been modeled. Transmission tower potential is presented.
R. Lanoie, J. Fortin
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