Results 281 to 290 of about 799,107 (315)
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IEEE Transactions on Power Delivery, 2020
To analyze interference induced by transient overvoltage, this article proposes an impulse injection technique for determining the impedance of a high-voltage air-core reactor over a wide frequency range.
Yu-hao Chen +6 more
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To analyze interference induced by transient overvoltage, this article proposes an impulse injection technique for determining the impedance of a high-voltage air-core reactor over a wide frequency range.
Yu-hao Chen +6 more
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An impulse method of measuring normal impedance at oblique incidence
Journal of Sound and Vibration, 1979Abstract An experimental method of determining the oblique incidence behaviour of sound absorbing materials is given. The method involves the measurement of acoustic impulses at the surface of an absorbing material and comparing the complex frequency components with those of a reference signal recorded remote from the surface.
J.C. Davies, K.A. Mulholland
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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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Issues Concerning Determination of Impulse Voltage, Current, and Impedance
IEEE Electromagnetic Compatibility Magazine, 2021The paper deals with satisfying the quasi-stationarity (or quasi-static) condition in studies of impulse quantities. The validity of the definition of voltage, current, and immittance is discussed. Examples are given regarding the electromagnetic compatibility issues when the quasi-stationarity condition is not met, thus the basic electric circuit ...
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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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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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Grid Impedance Frequency Response Measurements Using Pseudo-Random Impulse Sequence Perturbation
IEEE International Conference Power and Energy Systems, 2019The frequency-domain properties of supply network impedance are of increasing importance for applications such as grid-connected inverters, especially with reference to aspects such as the harmonic distortion specifications associated with grid ...
F. Mwaniki, H. Vermeulen
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