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Transient Impedance of High-Voltage Impulse Generating Systems
IEEE Transactions on Power Apparatus and Systems, 1970The interaction between an impulse generating system and an impulse measuring system is dependent on the reflections that occur at the generator and divider ends of the measuring system lead. In this paper the impedances that cause these reflections are studied and discussed. The effects of the interactions are illustrated with sample oscillograms.
Frank Creed, Malcolm Collins
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Force-sensorless human joint impedance estimation utilizing impulsive force
Advanced Robotics, 2020The paper is concerned with force-sensorless estimation of human joint impedance utilizing an impulsive force.
Keisuke Yagi +2 more
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Impulse response and radiation impedance of an annular piston
The Journal of the Acoustical Society of America, 1974An approach is presented to evaluate the impulse response of an annular piston, which is mounted in an infinite planar rigid baffle. Since the impulse response is defined to be the time-dependent force on the ring, which results from an impulsive velocity of the ring, the impulse response and radiation impedance of the ring are a Fourier transform pair.
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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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An impulse voltage calibrator of low output impedance
IEEE Transactions on Power Delivery, 2005A calibrator that produces full lightning impulses and chopped lightning impulses with variable chopping time is described. The calibrator uses series-connected power metal-oxide field-effect transistors as the main impulse switch and insulated gate bipolar transistors (IGBTs) as the chopping switch, and its output impedance is low to drive a ...
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Measurement and Analysis of Impulse Grounding Impedance for UHV Transmission Tower
2018 IEEE International Conference on High Voltage Engineering and Application (ICHVE), 2018In this paper, application of a portable instrument to gain impulse grounding impedance (IGI) characteristics for grounding device (GD) of ultra-high-voltage (UHV) 1000 kV transmission towers is introduced. The test currents of 8/20 $\mu$ s and 10/350 $\mu$ s were chosen as the injection signal sources to the grounding device respectively, while the ...
W. R. Si +4 more
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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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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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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 ...
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Research on Field Test of Impulse Grounding Impedance for Small Substation
2018 International Conference on Smart Grid and Electrical Automation (ICSGEA), 2018In this paper, application of a portable instrument to obtain impulse grounding impedance (IGI) characteristics for grounding grid of small substation is introduced. The test currents of 8/20 µs, 10/350 µs and 30/80 µs were chosen as the injection signal sources to the grounding grid respectively with simultaneous measurement of the response ...
Si Wen-Rong +5 more
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