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Variable Impedance Feed Structure for Impulse Radiating Antenna
2019 International Conference on Electromagnetics in Advanced Applications (ICEAA), 2019We present in this work, an alternative design for the TEM feeding structure of the Impulse Radiating Antenna (IRA). The variation here proposed consists of a set of TEM feeders whose impedance changes as a function of the radial distance measured from the focal point towards the parabolic reflector.
Felix Vega-Stavro +1 more
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Achievements in the Measurement of Tower-footing Impulse Impedance of Transmission Lines
2018 34th International Conference on Lightning Protection (ICLP), 2018This paper presents results obtained from field measurements of tower-footing impulse impedance carried out in real transmission lines. Tests were performed using an impulsive voltage generator, measuring the ground potential rise and the impressed current to determine the impulsive grounding impedance.
Silverio Visacro +2 more
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A reduced-scale experimental study of tower impulse grounding impedance
2017 1st International Conference on Electrical Materials and Power Equipment (ICEMPE), 2017Lightning withstand level of the transmission line is directly affected by the value of the tower impulse grounding impedance. While it's difficult to obtain the tower impulse grounding impedance accurately as its nonlinearity under impulse current. Therefore the study of the tower impulse grounding impedance characteristics is significant to lightning
Jiangtao Li, Hui Cao, Zheng Zhao
exaly +2 more sources
Impulse Impedance Tests on Laboratory Model Earth Electrode
2005 Asia-Pacific Conference on Applied Electromagnetics, 2006The investigation was carried out with the purpose of obtaining more information about electric discharges in sandy media. A cylindrical setup was chosen for impulse testing of earth rods to simulate the voltage gradients in the field when lightning propagates to earth rod.
N.A. Idris, H. Ahmad, M.N. Isa
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Impulse impedance tests on laboratory model ground electrodes
IEE Proceedings - Generation, Transmission and Distribution, 2003Impulse impedance of vertical rods embedded in several soil types was determined by laboratory tests under four temperatures and four soil moisture contents with three different waveshapes of the applied impulse voltage. To avoid errors due to current spikes caused by soil ionisation, it is proposed that the impulse impedance be defined as the ratio ...
P. Chowdhuri
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General Formulas for Lightning Impulse Impedance of Horizontal and Vertical Grounding Electrodes
IEEE Transactions on Power Delivery, 2021Voltage drop developed between the grounding electrode under lightning current and distant neutral ground determines the protection efficiency. The peak value of such voltage can be computed from known impulse impedance and current peak value.
Leonid Grcev +2 more
exaly +2 more sources
Veterinary Journal, 1998 peer reviewedThe aim of the present study was to investigate methodological and physiological aspects of complex respiratory impedance measurements in calves using the impulse oscillation technique.
P Reinhold, A Langenberg, P Lekeux
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IEEE Transactions on Power Delivery, 2021
The impulse grounding performance of distribution lines tower is the key factor to lightning protection. Few field high-current impulse test researches are conducted on distribution line tower.
Jian Xue +6 more
semanticscholar +1 more source
The impulse grounding performance of distribution lines tower is the key factor to lightning protection. Few field high-current impulse test researches are conducted on distribution line tower.
Jian Xue +6 more
semanticscholar +1 more source
Impulse Impedance and Effective Area of Grounding Grids
IEEE Transactions on Power Delivery, 2021High values and uneven distribution of the transient ground potential rise (TGPR) at grounding grid conductors in cases of lightning can disrupt the system safety and reliability. To assess the transient performance of grounding grids under lightning currents, a parametric analysis was performed with a computer simulation of 13,978 cases of time-domain
Leonid Grcev, Blagoja Markovski
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IEEE Transactions on Power Electronics, 2020
Grid impedance information occupies a fundamental and crucial position for the operation of grid-tied converters. Consequently, accurate and fast extraction of grid impedance is vital. The impulse injection method applied under the control loop of a grid-
Zipeng Liu, Jinjun Liu, Zeng Liu
exaly +2 more sources
Grid impedance information occupies a fundamental and crucial position for the operation of grid-tied converters. Consequently, accurate and fast extraction of grid impedance is vital. The impulse injection method applied under the control loop of a grid-
Zipeng Liu, Jinjun Liu, Zeng Liu
exaly +2 more sources