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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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Lightning: earthing electrodes harmonic response
11th International Symposium on High-Voltage Engineering (ISH 99), 1999The grounding behavior (resistive, capacitive, inductive) to a lightning discharge is related to the electrodes' geometrical dimensions, shapes and the soil characteristics (resistivity /spl rho/, permittivity /spl epsi/, permeability /spl mu/). The border between the capacitive and inductive behaviors corresponds to a frequency value (critical ...
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Quantifying the lightning transient performance of an earth electrode
IEEE AFRICON. 6th Africon Conference in Africa,, 2003The key question addressed in this paper is: for comparative purposes, what is a meaningful measure of the relative performance of an earth electrode under lightning transient conditions? Several methods of quantifying the transient performance are introduced and evaluated using time-domain transient analysis of equivalent circuits.
K.I. Nixon, I.R. Jandrell
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The current-loading capacity of earth electrodes
Journal of the Institution of Electrical Engineers, 1935The limits of current-loading capacity of earth electrodes are considered under the three types of conditions which may occur in practice, namely long-duration loading, which occurs where the earth current is insufficiently large to interrupt the supply; short-duration overloading, which occurs when the protective gear operates in the usual way; and ...
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FDTD Transient Analysis of Ring Earth Electrode
Proceedings of the 41st International Universities Power Engineering Conference, 2006The installation of wind turbine has enjoyed explosive growth worldwide; however, problems regarding interconnectivity to grids have arisen. It has also been pointed out that wind power generation facilities are exposed to lightning damage due to their configurations, and so different protective measures from those needed for conventional generators ...
Yasuda Yoh, Ueda Toshiaki
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