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Journal of Electronics and Advanced Electrical Engineering, 2021
An algorithm is proposed in this paper for calculating the impulse earthing resistances of vertical earthing electrodes. The proposed algorithm employs the average potential method to derive the formula of the low current earthing resistance. Unlike the previous algorithm, the soil ionization effect under high impulse current is taken into account by ...
Yongzheng Zhang, Xiaoqing Zhang
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An algorithm is proposed in this paper for calculating the impulse earthing resistances of vertical earthing electrodes. The proposed algorithm employs the average potential method to derive the formula of the low current earthing resistance. Unlike the previous algorithm, the soil ionization effect under high impulse current is taken into account by ...
Yongzheng Zhang, Xiaoqing Zhang
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2011 7th Asia-Pacific International Conference on Lightning, 2011
The ability of a horizontal earth electrode in reducing earth potential rise is limited because, beyond a certain length known as the effective length, no further reduction is obtained. In this paper, field experiments and computer simulations of a horizontal earth electrode is presented.
A. Elmghairbi +4 more
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The ability of a horizontal earth electrode in reducing earth potential rise is limited because, beyond a certain length known as the effective length, no further reduction is obtained. In this paper, field experiments and computer simulations of a horizontal earth electrode is presented.
A. Elmghairbi +4 more
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Grounding/earthing electrode studies. 2
Proceedings of Industrial and Commercial Power Systems Conference, 2002The paper details the effort to determine the adequacy of various methods of grounding/earthing electrodes installed in the alkaline, highly mineralized soil of the Las Vegas, Nevada area The grounding electrode testing program outlined has been prepared to address a number of questions relating to grounding [earthing] electrodes and soil conditions in
R.S. Howard, D.W. Zipse
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Potential Distribution About an Electrode on the Surface of the Earth
Physics, 1933An analytical study is made of the potential distribution about an electrode on a stratified earth, from the point of view of developing special formulas appropriate for computation at small and large distances from the electrode. Power series in the distance for small distances and simple asymptotic expansions for large separations are derived first ...
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Earth resistance of various forms of electrodes
Proceedings of the Institution of Electrical Engineers, 1969In a recent paper, Datta et al. have shown that a very simple method for finding the earth resistance of driven-rod electrodes can be used on the assumption that the equipotentials round the electrode conform to the shape of the electrode itself. In this paper, the method has been extended to various forms of electrode usually employed in practice ...
V.P. Gupta, R.L. Garg
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Distribution of Impulse Current in Earth Grid Electrodes
2020 55th International Universities Power Engineering Conference (UPEC), 2020This paper reports the results of an experimental study to measure the current distribution in the horizontal branches of (i) a reduced-scale earth grid buried in real soil and (ii) the grid with bonded vertical rods at its corners. Low- magnitude lightning-type impulse currents were injected at the centre and at the corner of the grid.
Salah Mousa +3 more
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Resistance to earth of substation earth electrodes in uniform and two-layer soils
Electrical Engineering, 1997The resistance to earth of square and rectangular grid and combined grid-multiple rods earth electrodes buried in uniform and two-layer soils has been analyzed for a wide set of electrodes and soil parameters. Novel approximate expressions for earth resistance are deduced based upon the data obtained by exact computer modelling. These expressions and a
J. Nahman, V. Djordjević
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Proceedings of the Institution of Electrical Engineers, 1964
The method of measuring an earth-electrode resistance has been known for a number of years, but there are some aspects of the measurement which are not fully understood. In particular, there are difficulties which arise when the earth-electrode system is of large physical dimensions, e.g. that of a substation or power station.
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The method of measuring an earth-electrode resistance has been known for a number of years, but there are some aspects of the measurement which are not fully understood. In particular, there are difficulties which arise when the earth-electrode system is of large physical dimensions, e.g. that of a substation or power station.
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Nickel–rare earth electrodes for sodium borohydride electrooxidation
Electrochimica Acta, 2016Binary alloys of nickel (Ni) and dysprosium (Dy) or samarium (Sm) of different composition were prepared. Their electrocatalytic activity in respect to borohydride oxidation in alkaline medium was investigated by cyclic voltammetry, chronoamperometry and chronopotentiometry. It was correlated to their morphological and structural properties examined by
Santos, DMF +6 more
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Resistance of large earth-electrode systems
Proceedings of the Institution of Electrical Engineers, 1972In three earlier papers by the same author, methods have been suggested for the measurement of the resistance of large earth-electrode systems, which presents certain difficult problems. These methods are all based on certain assumptions, and it may be that, in practice, these assumptions are not fully justified, and so errors may occur. Again, each of
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