Results 251 to 260 of about 36,181 (276)

Measurements of grounding resistances for high impulse currents

IEE Proceedings - Generation, Transmission and Distribution, 1998
The paper presents field measurements of surge characteristics of a concrete pole, a buried single conductor and a grounding net for high-impulse currents with a maximum magnitude of 40 kA and with a wavefront duration of a few microseconds. The measured results show that the grounding resistances are greatly dependent on the applied currents and have ...
S. Sekioka, H. Hayashida, T. Hara, A. Ametani   +3 more
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A New Impulse Grounding Resistance Measuring Instrument

Applied Mechanics and Materials, 2010
This paper introduces a convolution calculation method first, and thus to design a portable shock resistance measuring instrument. With the MATLAB simulation of software and field measurements of the measurement instrument, obtain the satisfactory results, thus proving the usefulness of this method.
Wen Jin Dai, Kai Wang
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Wavelet-based Analysis of Impulse Grounding Resistance–Experimental Study of the “A”-type Grounding System

Electric Power Components and Systems, 2015
AbstractThis article presents the results of experimental investigation concerned with the “A”-type grounding system's impulse characteristics, which are utilized for grounding of high-voltage transmission line towers. The investigation results point to the presence of high-frequency components in voltage and current signals that are not caused by ...
Meludin Veledar, Samir Avdakovic, Zijad Bajramovic, Milan Savic, Koviljka Stankovic, Adnan Carsimamovic   +5 more
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Experimental Investigation of Impulse Resistance of Different Type Grounding Electrodes

2020 International Multi-Conference on Industrial Engineering and Modern Technologies (FarEastCon), 2020
When spreading large pulsed currents in the soil, the electrical properties of the soil, as well as the characteristics of grounding, may differ significantly from the values obtained when spreading a weak stationary current. This is due to the ionization of the soil near the electrode and the formation of spark channels, which leads to a noticeable ...
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Computing grounding resistance and impulse impedance of horizontal electrodes parallel or perpendicular to the interface of a vertically stratified soil using transmission line theory

Electric Power Systems Research, 2021
Abstract This work shows a procedure to compute the resistance and harmonic impedance of horizontal grounding electrodes buried in a vertically stratified soil. Such electrodes can be parallel or perpendicular to the interface of the vertically stratified soil. An additional resistive element is developed for such condition of soil. A procedure based
Raphael Batista, José Osvaldo Saldanha Paulino   +1 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.
Tao Wang 0044, Xianzhe Hu, Yangping Li, Qi Wang   +3 more
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Influence of Overhead Ground Wire Height and Impulse Ground Resistance on Lightning Protection Performance of Distribution Line

Advanced Materials Research, 2015
Since distribution lines have relatively weak insulation compared to power transmission lines, it is more liable to lightning damages. This paper reports a study of how overhead ground wire height and impulse ground resistance affect the lightning protection performance.
Yao Zhang Yu, Jun Kang Ni, Jun Yu Han, Bin Ren, Ao An Li, Chong Xin Liu   +5 more
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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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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 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
openaire   +1 more source