Results 221 to 230 of about 9,424 (256)

Grounding Grids Transient Simulation

IEEE Transactions on Power Delivery, 2005
A transient grounding grid numerical model is developed. The results are compared with measurements done by other authors. The agreement between the simulations and measured data are completed with the comparison with theoretical results and concepts. Several cases with different soil parameters and grid geometry are presented.
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A Practical Approach for Determining the Ground Resistance of Grounding Grids

IEEE Transactions on Power Delivery, 2006
This paper starts from the premise that ground resistance is independent of earth-fault current and presents a new method for calculating the ground resistance of grounding grids using the finite-element method. The results obtained using the method proposed are compared with results measured experimentally and results published by other authors.
null Guemes-Alonso, F.E. Hernando-Fernandez, F. Rodriguez-Bona, J.M. Ruiz-Moll   +3 more
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Interconnections criteria of grounding grids in global grounding systems

2018 IEEE/IAS 54th Industrial and Commercial Power Systems Technical Conference (I&CPS), 2018
A Global Grounding System is defined as the combination of local grounding systems, obtained by their interconnection, which ensures, thanks to their proximity, that no dangerous touch voltages can arise. The interconnection of grounding systems via the armors of the MV cables, between secondary substations and HV/MV stations is herein analyzed to ...
M. L. DI Silvestre, L. Dusonchet, S. Favuzza, S. Mangione, L. Mineo, M. Mitolo, E. Riva Sanseverino, G. Zizzo   +7 more
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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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Fundamental Considerations and Impluse Impedance of Grounding Grids

IEEE Transactions on Power Apparatus and Systems, 1981
The 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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Evaluation of the Accuracy of Grounding Impedance Measurement of Grounding Grid

Journal of the Korean Institute of Illuminating and Electrical Installation Engineers, 2009
Recently, 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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Beamlet characteristics in the accelerator with multislot grounded grid

Review of Scientific Instruments, 2010
Characteristics of multibeamlets are investigated by means of beamlet monitoring technique. The beamlets are extracted from an accelerator with multislot grounded grid and the profiles are observed as infrared images of temperature distributions on a cold isostatic pressed graphite plate exposed by H-beamlets.
K, Tsumori, M, Osakabe, Y, Takeiri, O, Kaneko, K, Nagaoka, K, Ikeda, H, Nakano, Y, Oka, M, Shibuya, E, Asano, S, Komada, T, Kondo, M, Sato   +12 more
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Indirect impact of lightning discharge on a grounding grid

2010 30th International Conference on Lightning Protection (ICLP), 2010
The paper deals with an indirect impact of the lightning discharge on a grounding grid. To analyze the electromagnetic coupling between the electromagnetic wave generated by an indirect lightning strike and grounding system we use the concept of electric dipole to calculate the lightning induced and the transmission line approximation combined with ...
Harrat, B., Nekhoul, B., Poljak, D., Kerroum, K., El khamlichi Drissi, K.   +4 more
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Signal transmission model for the substations grounding grid

Expert Systems with Applications, 2014
The signal of the wireless sensor network in grounding grid, owing to energy loss, network congestion, path constraints and other factors, is easy to delay even partially losing. In order to ensure that the signal can be transmitted effectively in grounding grids for the substation, this paper presents a method based on traffic model of back-off ...
Xianghui Xiao, Minfang Peng, Jaime S. Cardoso 0001, Lei Wang, Meie Shen   +4 more
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Smart Grid Information Exchange – Securing the Smart Grid from the Ground

2013
The Smart Grid is based on information exchange between various stakeholders using open communication technologies to control the physical electric grid through the information grid. Protection against cyber attacks is essential to ensure a reliable operation of the Smart Grid.
Steffen Fries, Rainer Falk, Ariane Sutor
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