Results 241 to 250 of about 7,207,987 (296)

Comparison of versatile harmonics current compensation and specific number harmonics current compensation

Proceedings of the IEEE International Conference on Industrial Technology (ICIT'96), 2002
New compensation method of specific number harmonics currents is proposed and its excellent compensation effects are explained in comparison with conventional versatile compensation. In addition, preference compensation of specific number harmonics currents is also proposed and experimental data with a small model proves the superiority of this method.
M. Yano, S. Kuramochi, N. Nanaumi
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Harmonics in transformer magnetizing currents

Proceedings of the American Institute of Electrical Engineers, 1915
The purpose of this paper is to show in a concise manner the cause and effects of higher harmonic currents in magnetizing currents of transformers. A hypothetical case is analyzed to show the cause of the harmonics; then the schemes of connecting transformers that are commonly used for polyphase transformation are taken up and the effects of the ...
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Harmonic oscillator driven by a quantum current

Physical Review Letters, 1989
We show that under certain circumstances a simple quantum harmonic oscillator driven by a quantum current evolves to unique pure states even if started as a mixed state. In various limits, these states exhibit nonclassical properties such as sub-Poissonian statistics, or more interestingly resemble macroscopic superpositions.
, Slosser, , Meystre, , Braunstein
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Current Harmonics Measurement by Means of Current Transformers

IEEE Transactions on Power Delivery, 2007
This paper analyzes the accuracy of current transformers (CT) when excited with nonsinusoidal currents. It uses a nonlinear model that accounts for the minor hysteresis loop of the core. It was concluded that instrument transformers with accuracy class 0.6 or better provide reasonably accurate measurements of current harmonics magnitudes, however the ...
Alexander E. Emanuel, John A. Orr
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Harmonic Contributions Evaluation With the Harmonic Current Vector Method

IEEE Transactions on Power Delivery, 2008
A method to evaluate harmonic contributions at the point of common coupling is presented in this paper. The proposed approach is based on the harmonic current vector method where reference impedances are introduced. Resistance defined at fundamental frequency with measurements is used as the customer-side reference impedance.
Tomaz Pfajfar, Bostjan Blazic, Igor Papic   +2 more
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Voltage and current harmonics caused by corona

Journal of the American Institute of Electrical Engineers, 1921
THE FOLLOWING investigation was made to study the effects of corona in producing voltage and current harmonics in transmission systems. In the early work on corona in 1910 a very complete oscillographic study was made of voltage and current. It was found that the current wave of corona loss very much resembled the excitation current wave of a ...
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Harmonic measurements: current and voltage transducers

199 IEEE Power Engineering Society Summer Meeting. Conference Proceedings (Cat. No.99CH36364), 2003
An overview of the development of special current and voltage transducers at the National Research Council of Canada for accurate measurements of harmonics in power systems will be presented. The transducers include two-stage and electronically-aided instrument transformers, openable-core AC and AC/DC current transformers, multi-stage clamp-on current ...
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A study on randomly varying harmonic currents and total harmonic distortion of currents in power systems

2005 International Conference on Future Power Systems, 2005
Harmonic analysis is an important application to power systems and an efficient approach to evaluate the injected total harmonic distortion (THD) of currents flowing into a power system due to the summation of randomly varying harmonic currents produced by AC-to-DC power converters is presented in this paper.
null Li Wang, null Kuo-Hua Liu
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Current harmonics in nonlinear resistance circuits

Electrical Engineering, 1935
A semigraphical method of solving for harmonics in the input current to a network containing any number of linear and nonlinear resistances in any combination, when a sinusoidal voltage is applied across the network, is presented herewith. The treatment is restricted to nonlinear resistances in which the d-c volt-ampere characteristic is the same ...
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Reducing Supply Current Harmonics

IEEE Industry Applications Magazine, 1998
In this article, a simple and effective method for reducing the supply current harmonics has been proposed for a parallel connected 12-pulse thyristor converter with an interphase reactor. The proposed method requires only an interphase reactor with an optimal inductance value being much smaller than conventional inductance values, without any ...
Toshihiko Tanaka, Naotsugu Koshio, Hirofumi Akagi, Akira Nabae   +3 more
openaire   +1 more source