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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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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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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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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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Impedance characteristics of grounding electrodes on earth surface
2010 30th International Conference on Lightning Protection (ICLP), 2010Abstract This paper deals with the comparison of impedance characteristics of grounding electrodes on earth surface and those that are buried underground. The impedance characteristics are investigated analytically, experimentally and numerically.
Akihiro Ametani +3 more
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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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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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Study on Sharing Earth Electrode of UHVDC
2006 International Conference on Power System Technology, 2006This paper analyzes the different operation modes of the UHVDC system sharing earth electrode from the aspect of power system stable operation. Two UHVDC system rectifiers and inverters sharing earth electrode were studied respectively by electromagnetic transient analysis software EMTP-RV based on the main parameters of Xiang jiaba to Nan hui ...
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Materials for electrodes based on rare earth manganites
Solid State Ionics, 1994Abstract For application in high temperature fuel cells and oxygen sensors, alkaline earth doped lanthanoide manganites have been studied systematically with regard to preparation conditions, structures, electrical conductivities and thermal expansion coefficients, respectively.
P SHUK, L TICHONOVA, U GUTH
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Earth-electrode systems for large electric stations
Proceedings of the IEE Part A: Power Engineering, 1957Interconnected systems have increased considerably in recent years, and the large possible earth-fault currents resulting require further thought being given to earth system design, especially in areas of high soil resistivity. The paper discusses the special practical problems of the design, construction and testing of earth electrode systems for ...
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