Results 261 to 270 of about 8,261,049 (301)

Superposition of current and voltage harmonics

2018 ELEKTRO, 2018
This paper deals with power quality that is aimed on voltage and current harmonics. The analysis describes the household appliances producing the harmonic interference, because they consist of semiconductor components. The next reason is that a large number of household appliances are operated in the same time.
Andrej Bolf, Alena Otcenasova, Michal Regula, Marek Novak   +3 more
openaire   +1 more source

Harmonic analysis of current waveforms using optical current sensor

IEEE Transactions on Instrumentation and Measurement, 2002
This paper reports on the research and development of an optical current sensor for harmonic analysis within the electricity supply network. The device has a measurement capability, limited by the sampling frequency of the analog-to-digital converter, to around 20 kHz. We report on experimental verification of these measurements up to the 60th harmonic
Michie, W.C., Cruden, A.J., Niewczas, P., Madden, W.I., McDonald, J.R., Gauduin, M.   +5 more
openaire   +4 more sources

Influence of Harmonic System Voltages on the Harmonic Current Emission of Photovoltaic Inverters

2007 International Conference on Power Engineering, Energy and Electrical Drives, 2007
Harmonic currents of photovoltaic (PV)-inverters show a significant dependency on the harmonic voltage content of the alternating current (AC)-system voltage. Measurements of harmonic currents were carried out in low-voltage (LV)-systems and under laboratory test conditions with adjustable harmonic content of the AC-voltage.
J. SCHLABBACH, A. GROSS, CHICCO, GIANFRANCO   +2 more
openaire   +2 more sources

Harmonic pricing model based on harmonic costs and harmonic current excessive penalty

2011 2nd International Conference on Artificial Intelligence, Management Science and Electronic Commerce (AIMSEC), 2011
Harmonic will do great harm to power grid and cause economic losses. In order to reduce such losses, the power utilities need additional investment for harmonic suppression measures. The harmonic losses and the additional investment capital together constitute the harmonic costs and they are the basis of harmonic pricing.
null Yong Peng, null Shun Tao, null Qun Xu, null Xiangning Xiao   +3 more
openaire   +1 more source

Effect of Harmonics Current on the Performance of Current Transformers

2022
Muhammad Syarifuddin Bin Sha'ari, Noramalina Abdullah   +1 more
openaire   +1 more source

The calculation of harmonics in rectified currents

Journal of the Institution of Electrical Engineers, 1930
The classical mathematical method of calculating the wave-form of rectified currents is applicable to rectifiers whose volt-ampere characteristic consists of two interesting straight lines. It is based on the observed fact that there is for each rectifier a conducting phase and an insulating phase.
openaire   +1 more source

Harmonic-current-restrained relays for differential protection

Electrical Engineering, 1938
DIFFERENTIAL relaying is the commonly accepted means of protecting large power transformers, a-c generators, and station bus systems against internal faults.1 The methods and circuits employed in various instances, while differing in detail, are all fundamentally the same in basic principle.
L. F. Kennedy, C. D. Hayward
openaire   +1 more source

Current International Harmonization Efforts

2009
Efforts towards international cooperation or harmonization can occur at varying levels – at the level of technical and scientific requirements, of dossier format and content, or of assessment and review practices. Three contrasting models for regional cooperation in drug regulation harmonization, the corporate, populist, and cooperative, are described ...
openaire   +1 more source

Valuation of harmonic current injections

2002
The number of power electronic and distorting loads, continue to grow at a rapid pace. Accompanying this growth in distortion sources is an increased sensitivity of certain types of loads to harmonic distortion, and poor power quality in general. The result is greater variance in the value loads place on a harmonic free supply, and therefore what they ...
openaire   +2 more sources

Harmonic Currents and Canonical Complexes

2001
In the present chapter we establish a Hodge theory for the complexes In particular, we prove a decomposition of the spaces which resembles the Hodge decomposition on compact Riemannian manifolds. The method can be explained easily in the classical framework. Let (M,g) be a compact Riemannian manifold with Hodge-Laplacian on p-forms.
openaire   +1 more source