Results 11 to 20 of about 17,054,748 (190)

High-latitude observations of impulse-driven ULF pulsations in the ionosphere and on the ground [PDF]

, 2003
International audienceWe report the simultaneous observation of 1.6?1.7 mHz pulsations in the ionospheric F-region with the CUTLASS bistatic HF radar and an HF Doppler sounder, on the ground with the IMAGE and SAMNET magnetometer arrays, and in the ...
Menk, F. W., Lester, M., Honary, F., Wright, D. M., F. W. Menk, M. Lester, T. K. Yeoman (7601525), F. Honary (7604621), T. K. Yeoman, M. Lester (7589660), D. M. Wright (7583069), D. M. Wright, F. Honary, F. W. Menk (7675571), Yeoman, T. K.   +14 more
core   +4 more sources

Effect of Impulse Polarity on a New Grounding Device with Spike Rods (GDSR)

Energies, 2020
The characterizations of grounding systems subjected to high impulse conditions are known to be dependent on the polarity, current to peak time and discharge time, as well as the electrical properties of the soil, and the grounding electrodes themselves.
Abdul Wali Abdul Ali, Nurul Nadia Ahmad, Normiza Mohamad Nor   +2 more
doaj   +1 more source

Investigation of Spherical Electrode Grounding System Under High Impulse Conditions with Different Polarities

Journal of Physics: Conference Series, 2021
Abstract There have been many studies in the pasts, which showed that under high impulse conditions, soil ionization process around the electrode would occur, which results in lower resistance and lower transient voltage on the electrode.
HA Hamid, MR Adzman, NH Hanafi, NM Nor, S Abdullah, MS Reffin, NA Etobi, R Abd-Rahman   +7 more
openaire   +1 more source

Evaluation of Lightning Impulse Test by Frequency Response Analysis [PDF]

, 2006
In this work are presented the basis for improving the interpretation of transformer lightning impulse test and the development of a graphical user interface system, which allows comparisons of time domain data and frequency response.
Jorge Ramirez, Baudilio Valecillos, Valecillos, Baudilio, Ramírez, Jorge   +3 more
core   +3 more sources

Possibility of using RIT technology in the ground conditions of Vietnam [PDF]

E3S Web of Conferences, 2020
The article compares engineering and geological conditions in the coastal areas of Vietnam and Tunisia. A sufficiently high similarity of soil structure and their physical and mechanical properties was noted.
Kharin Yury
doaj   +1 more source

Impulse response and electric field computation of various rod electrodes

Alexandria Engineering Journal, 2022
Ionisation process has been known to occur in soil, when earth electrodes are subjected under high impulse conditions. In this paper, experimental results on impulse response of various earth electrodes, namely a conventional copper rod electrode, and ...
Nur Farahi Idris, Normiza Mohamad Nor, Azwan Mahmud   +2 more
doaj   +1 more source

Seasonal Influences on the Impulse Characteristics of Grounding Systems for Tropical Countries

Energies, 2019
One of the most important parameters of the performance of grounding systems is the soil resistivity. As generally known, the soil resistivity changes seasonally, hence the performance of grounding systems, at DC and under high impulse conditions.
Muhd Shahirad Reffin, Abdul Wali Abdul Ali, Normiza Mohamad Nor, Nurul Nadia Ahmad, Syarifah Amanina Syed Abdullah, Azwan Mahmud, Farhan Hanaffi   +6 more
doaj   +1 more source

High‐latitude ionospheric response to a sudden impulse event during northward IMF conditions [PDF]

Journal of Geophysical Research: Space Physics, 2000
A high‐density structure under northward interplanetary magnetic field BZ conditions is identified at the Wind and IMP 8 satellites, both in the solar wind on August 22, 1995. A compression of the magnetosphere is observed by the GOES 7 magnetometer within a few minutes of the pressure increase encountering the magnetopause.
T. Moretto, A. J. Ridley, M. J. Engebretson, O. Rasmussen   +3 more
openaire   +1 more source

Investigations on the Performance of a New Grounding Device with Spike Rods under High Magnitude Current Conditions

Energies, 2019
In many publications, the characteristics of practical earthing systems were investigated under conditions involving fast-impulse currents of different magnitudes by field measurements.
Abdul Wali Abdul Ali, Nurul Nadia Ahmad, Normiza Mohamad Nor, Muhd Shahirad Reffin, Syarifah Amanina Syed Abdullah   +4 more
doaj   +1 more source

The Estimation of Lightning Impulses Superimposed onto Pre-Stressed DC Breakdown Voltages Using the Leader Propagation Method

Energies, 2022
The impulse breakdown attributes are of rudimentary importance in the insulation coordination in the gas-insulated switchgear (GIS). The critical voltage waveshape for the insulation is the surge over voltages.
Rashed Meer, Yasin Khan, Nissar Rasool Wani, Abdulrahman Ali Al-Arainy   +3 more
doaj   +1 more source