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2019
Tests with high impulse currents are performed to simulate the stress of power apparatus in the high-voltage grid caused by lightning and short circuits. Various impulse test currents and the corresponding measurement methods are standardized in IEC 62475, together with DC and AC currents.
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Tests with high impulse currents are performed to simulate the stress of power apparatus in the high-voltage grid caused by lightning and short circuits. Various impulse test currents and the corresponding measurement methods are standardized in IEC 62475, together with DC and AC currents.
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High-Impulse Current and Voltage Measurement
IEEE Transactions on Instrumentation and Measurement, 1970This paper is a survey of methods of high-impulse current and voltage measurement. Typically, such measurement techniques must now include capabilities for measuring high-energy impulses having peak powers as high as many megawatts, currents as high as many mega-amperes, or voltages as high as several megavolts, with rise times as short as a fraction ...
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Measurement of High-Current Impulses
2013For the conventional measurement of impulse currents during tests of power apparatuses up to a few 100 kA, low-ohmic resistors or magnetic coils are used in combination with digital recorders enabling computer-aided processing of the recorded data.
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Design and realization of a current sensor for impulse current waveform measurement
2016 IEEE Conference on Electromagnetic Field Computation (CEFC), 2016This paper presents a current sensor for current measurement in high frequency high voltage pulse power supplies, the output of which is DC current superposed with impulse current waveform. The current sensor is made of two magnetic cores. One works in fluxgate principle to measure DC current. While the other is based on transformer effects for impulse
Xiaoguang Yang +5 more
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Current Sheet Structure in an Inductive-Impulsive Plasma Accelerator
AIAA Journal, 1971Probe and laser light-scattering measurements of electron density have been made in the current sheet of a pulsed inductive accelerator. The discharge consists of a thin flat disk of pure je current. The only current carriers are electrons. The gas is ionized and swept up into a 4 mm thick current sheet.
C. DAILEY, R.H. LOVBERG
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Impulsivity in personality disorders
Current Opinion in Psychiatry, 2018Impulsivity is considered a trans-diagnostic feature of many mental disorders, yet our understanding of the concept and approaches to measurement have evolved significantly with advances in neuroimaging. This review will provide an overview of impulsivity as it is currently understood, its association with personality disorder and implications for ...
Catherine, McHugh +1 more
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Low-Resistance Shunts for Impulse Currents
IEEE Transactions on Power Apparatus and Systems, 1971In high-voltage technology, plasma physics and power electronics low-ohmic resistors are frequently employed to measure high, rapidly changing currents. Their voltage drop is adversely affected by stray inductances and skin effect. A more complete analysis of low- ohmic tubular type and squirrel cage type resistors including such effects is presented ...
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IEC 60060-1 Requirements in Impulse Current Waveform Parameters
International Journal of Emerging Electric Power Systems, 2005There are IEC 60060-1 requirements on three impulse current waveforms. For the damped-oscillating waves, margins of the front time T1 and the time to half the peak T2 are 10 per cent whilst any value after the polarity reversal has to be less than 20 per cent of the peak value.
S. Sato, T. Harada, M. Hanai
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Impulse current testing system for simulating lightning effect
2014 International Conference on Audio, Language and Image Processing, 2014This paper introduced the impulse current testing system for simulating lightning effects. The shield method to suppress the interference was addressed in this paper. After compared with three filter methods, it was verified that the wavelet transform is most suitable for measuring the impulse by using the digital filter technology to get the actual ...
Yi Lin, Qibin Zhou
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Analytical Study of Impulse Current Measuring Shunts With Cage Configuration
IEEE Transactions on Instrumentation and Measurement, 2012In this paper, an analytical study of high-impulse current measuring shunts with cage configuration is presented. Through the use of the partial mutual inductance method, an equivalent first-order model is developed, and a discussion of the minimization of the time constant taking into account physical constraints for two different materials is ...
Ferrero R +2 more
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