Results 211 to 220 of about 2,695 (261)

A Method for Reducing Grounding Impedance

Electrical Engineering in Japan, 2013
SummaryThis paper investigates grounding impedance reduction with various shapes of grounding electrodes in comparison with a conventional vertical rod based on field measurements and FDTD simulations. It is found that a vertical rectangular conducting plate is effective for reducing the transient and steady‐state impedance to less than half that of ...
Yuta Fujita, Hiroshi Morii, Takashi Kubo
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Neutral Currents And Ground Impedances

12th WVU International Mining Electrotechnology Conference, 2005
It has been observed that the amount of ground system impedance has an effect on the neutral current magnitude of a system which operates with harmonics present; these effects are addressed in this paper. The study under discussion includes the development of a model which can be used to effectively simulate the response of a distribution system to ...
D.R. Adams, A. Feliachi, W.L. Cooley
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Calculating the impedance of a grounding system

IEEE Transactions on Magnetics, 1996
Following up previous research concerning low frequency electromagnetic emission from a grounding system [Nekhoul et al., 1995], the authors suggest a methodology which allows a complete electromagnetic study by finite element method (FEM) of a grounding system in the significant frequential spectrum of a stroke of lightning or a short circuit (f/spl ...
B. Nekhoul, P. Labie, F.X. Zgainski, G. Meunier, F. Morillon, S. Bourg   +5 more
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The impedance of a grounded wire

Geophysics, 1942
Abstract The impedance of an insulated wire stretched along the surface of the earth, regarded as a homogeneous conductor, is a function of frequency and of the conductivity of the earth. Formulas are given for the inductance and the resistance of such a wire which are applicable under conditions met with in geophysical prospecting.
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Arcing Grounds and Effect of Neutral Grounding Impedance

Transactions of the American Institute of Electrical Engineers, 1930
This paper was written to review and extend the theory of overvoltages due to arcing grounds because of the increasing tendency to use impedances between the neutral point and the ground, thereby losing the advantage of the solidly grounded neutral. The ``third class conductor'' theory of Steinmetz is touched upon very briefly and is considered as not ...
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Transient impedance of grounding rods

11th International Symposium on High-Voltage Engineering (ISH 99), 1999
The aim of this paper is the correlation of the transient impedance and its parameters with the stationary resistance of simple grounding systems. Impulse current tests of the standard form 8/20 /spl mu/s were performed on several types of equilateral triangles and single driven rods of different lengths.
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Characteristics of Grounding Impedances of Carbon Compound Grounding Electrodes

Journal of the Korean Institute of Illuminating and Electrical Installation Engineers, 2011
This paper presents characteristics of frequency-dependent grounding impedance and transient grounding impedance for the carbon compound grounding electrode used in the installation of computerized electronic equipment and lightning protection system.
Kang-Soo Lee, Bok-Hee Lee
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Study on characteristics of grounding impedance of large grounding grid

2017 IEEE International Conference on Environment and Electrical Engineering and 2017 IEEE Industrial and Commercial Power Systems Europe (EEEIC / I&CPS Europe), 2017
As the large grounding grid occupies large area, the potential difference on the grounding grid is obvious, and the proportion of inductive components in the grounding impedance is larger. Then the design and the operation of the grounding grid are different from the small grounding grid. The paper studies the characteristics of resistive component and
Zhizhong Li, Sen Wang, Feng Guo, Bo Zhang   +3 more
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Analysis of the Ground Impedance of Ground Grids Combined with the Carbon Ground Electrodes

Journal of the Korean Institute of Illuminating and Electrical Installation Engineers, 2013
This paper deals with the frequency-dependent ground impedance of ground grids combined with the carbon ground electrodes. Ground grids are generally valid for multipurpose grounding systems as well as lightning protection systems. The carbon ground electrodes may be supplementarily used to reduce the high frequency ground impedance and to improve the ...
Bok-Hee Lee, Sang-Hyun Um, You-Ha Kim, Kang-Soo Lee, Byung-Wook Jeon, Jong-Hyuk Choi   +5 more
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Grounding for surge-protective devices ground resistance versus ground impedance

2006 IEEE Power Engineering Society General Meeting, 2006
The aim of this paper is to address the often loosely used terms of impedance and resistance as related to grounding, and to educate the reader as to the significant difference between these two terms when contemplating the behavior of grounding systems impressed with transient impulse currents.
A.J. Surtees, F.D. Martzloff, A. Rousseau   +2 more
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