Results 11 to 20 of about 45,208 (290)
Review: Factors Affecting the Performance of Ground Electrodes under High Impulse Currents
Energies, 2023 Most studies have observed that the impedance values of ground electrodes under high impulse conditions (Zimp) are lower than the resistance values under steady-state conditions (RDC).
Normiza Mohamad Nor
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Impulse Characteristics of Highly Wetted Soils [PDF]
Journal of Electrical and Electronics Engineering, 2023 It has been well accepted that under high impulse conditions, ionisation process in soil would occur, causing the ground resistance value to fall to a lower value than that obtained at low voltage low current, RDC.
REFFIN Muhd Shahirad +4 more
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IET Science, Measurement & Technology, 2021 The impulse impedance of the tower is the core parameter to evaluate the lightning protection performance of the transmission line. The high soil resistivity and the underground rock layers in the mountainous areas will induce large impulse impedance and
Lin Huang +5 more
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Energy Reports, 2022 Large-capacity impulse test of distribution transformer requires a large amount of instantaneous energy, while the impulse mode of conventional dedicated high-voltage line and generator requires synchronous switch, adjusted impedance, generator, etc ...
Bo Niu +4 more
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Approximation of the acoustic radiation impedance of a cylindrical pipe [PDF]
, 2008 Useful approximation formulae for radiation impedance are given for the reflection coefficients of both infinitely flanged and unflanged rigid-walled cylindrical ducts.
A.N. Norris +14 more
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Impedance and impulse response measurements using low-cost components [PDF]
The Journal of the Acoustical Society of America, 1982 A thin 27-mm-o.d. disk transducer (from Radio Shack 273-060 signaler) is RTV sealed to the end of a measurement tube whose 15 mm i.d. not only approximates the transducer disk's nodal circle but also the i.d. of a clarinet, sax, or trumpet mouthpiece. A 10-mm-o.d.
M. I. Ibisi, A. H. Benade
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High current field test of impulse transient characteristics of substation grounding grid
The Journal of Engineering, 2018 It is significant to research the impulse characteristics of substation grounding grid for its optimal design and safe and stable operation. In order to obtain the impulse transient characteristics of substation grounding grid under lightning impulse ...
Xuefang Tong, Xiaohui Dong, Bo Tan
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Impulse Generation by an Open Shock Tube [PDF]
, 2008 We perform experimental and numerical studies of a shock tube with an open end. The purpose is to investigate the impulse due to the exhaust of gases through the open end of the tube as a model for a partially filled detonation tube as used in pulse ...
Browne, S. T. +3 more
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Measurement of impulse noise propagation over natural impedance surfaces [PDF]
The Journal of the Acoustical Society of America, 1985 The peak sound pressure level decay with distance of the impulse noise from hand grenade simulators has been measured over the following types of surfaces: water, swamp, rocky ground with small bushes, dead grass with sparse snow cover, and dense evergreen forest. The ground impedance is estimated for each surface using the calculation of R. Raspet. H.
Nelson Lewis, Richard Raspet
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Digital Impedance Emulator for Battery Measurement System Calibration
Sensors, 2021 Meaningful information on the internal state of a battery can be derived by measuring its impedance. Accordingly, battery management systems based on electrochemical impedance spectroscopy are now recognized as a feasible solutions for online battery ...
Francesco Santoni +3 more
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