Results 221 to 230 of about 2,695 (261)
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Mutual Impedances of Grounded Circuits
Bell System Technical Journal, 1922Formulas are derived for the direct-current mutual resistance and inductance between circuits grounded at the surface of the earth. For circuits composed of straight filaments, the mutual inductance is reduced to known Neumann integrals which involve only comparatively simple expressions for the case of horizontal, coplanar conductors above, below or ...
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Mutual impedance of grounded wires
Electrical Engineering, 1931A formula is given for the mutual impedance between two insulated wires of negligible diameter lying on the surface of the earth and grounded at their end-points.
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Fundamental Considerations and Impluse Impedance of Grounding Grids
IEEE Transactions on Power Apparatus and Systems, 1981The impulse impedance of a grounding grid must be known for determining its performance while discharging impulse currents to ground if problems concerning lightning protection and transients under ground faults are to be accurately analysed. This paper out-lines the basic concepts required for this study, analyses the equivalent circuit ,21]of a ...
R. Verma, D. Mukhedkar
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High Frequency Characteristics of Impedances to Ground And Field Distributions of Ground Electrodes
IEEE Transactions on Power Apparatus and Systems, 1981High frequency characteristics of impedances to ground and field distributions of ground electrodes are calculated by the current simulation method together with the method of images. Numerical calculations concerning some typical electrodes are shown.
T. Takashima, T. Nakae, R. Ishibashi
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COMPEL: The International Journal for Computation and Mathematics in Electrical and Electronic Engineering, 2013
Purpose – The purpose of this paper is to propose a fast, accurate and efficient algorithm for assessment of input impedance and consequently the evaluation of transient impedance of the grounding electrode. Design/methodology/approach – The mathematical model is ...
Poljak, Dragan, Čavka, Damir
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Purpose – The purpose of this paper is to propose a fast, accurate and efficient algorithm for assessment of input impedance and consequently the evaluation of transient impedance of the grounding electrode. Design/methodology/approach – The mathematical model is ...
Poljak, Dragan, Čavka, Damir
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Evaluation of the Accuracy of Grounding Impedance Measurement of Grounding Grid
Journal of the Korean Institute of Illuminating and Electrical Installation Engineers, 2009Recently, the common grounding systems are adapted in most large structures. Since the ground resistance is insufficient to evaluate the performance of grounding systems, it is needed to measure grounding impedance. Even though the methods of measuring grounding impedance of large grounding systems are presented in IEEE standard 81.2, but they have not
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NOTE ON THE IMPEDANCE OF A GROUNDED WIRE
Geophysical Prospecting, 1960AbstractThe self‐inductance of a straight grounded wire lying on the surface of the earth is computed from a (slightly corrected) formula given by A. Wolf and compared to approximate formulae.
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Experimental Study of Transient Ground Impedances
IEEE Power Engineering Review, 1981This paper presents the results of an experimental investigation of the transient behavior of ground impedances. The results obtained were used to derive equivalent circuits. An analog model was constructed and satisfactory agreement with the theoretical analysis obtained.
R. Kosztaluk, M. Loboda, D. Mukhedkar
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Transient impedance of GIS grounding grid
IEEE Transactions on Power Delivery, 1995The transient impedance of a grounding grid for a commercial 550 kV gas-insulated substation (GIS) was measured on site using steep front currents with rise time from 100 ns to 2 /spl mu/s. From the measured results, it was found that the transient impedance of the measured grid for those currents is simulated by a series circuit with an inductance 1 ...
S. Karaki +6 more
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Aspects of direct deduction of ground impedance
The Journal of the Acoustical Society of America, 2007ANSI S1.18 1998 offers a method for determining ground impedance by fitting data to templates of the magnitude of level difference obtained using a point source and two vertically separated microphones with specified geometries according the ‘‘acoustical-softness’’ of the ground.
Keith Attenborough +3 more
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