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1
Content available The Case of Hidden Instantaneous Powers
Balci M. E., Emanuel A. E.
Electrical Power Quality and Utilisation. Journal
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2008
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Vol. 14, iss. 2
3--5
EN
This brief communication addresses the case of a dc nonlinear load supplied with a perfectly constant instantaneous power. A careful analysis shows that this condition does not provide optimum transfer of electric energy .
2
Content available The effect of the Integration Interval on the Measurement Accuracy of rms Values and Powers in Systems with Nonsinusoidal Wavefo
Peretto L., Willems J. L., Emanuel A. E.
Electrical Power Quality and Utilisation. Journal
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2007
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Vol. 13, nr 1
113-119
EN
In this paper the possibility of errors in the measurement of average values (in particular rms values or active powers) in power systems under nonsinusoidal conditions are discussed. The errors considered are either due to the fact that the measurement time interval is not an exact multiple of the fundamental period of the voltage and current signals, or due to the presence of interharmonics or subharmonics. The errors are calculated and the results are illustrated by means of simple examples.
3
Content available Intrinsic Power: Some Observations
Emanuel A. E.
Electrical Power Quality and Utilisation. Journal
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2007
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Vol. 13, nr 1
83-87
EN
This paper deals with the subject of intrinsic power. This form of nonactive power is always present when active power is present. The intrinsic power does not cause power loss in conductors or ferromagnetic components. The paper describes different kinds of intrinsic power and shows how it originates.
4
Content available About the Rejection of Poynting Vector in Power Systems Analysis
Emanuel A. E.
Electrical Power Quality and Utilisation. Journal
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2007
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Vol. 13, nr 1
43-49
EN
This article is a response to a paper presented at the sixth International Workshop on Power Definitions, a report that rejected the fact that the Poynting vector (PV) provides useful information “for academic interpretation of power properties and for practical applications of power theory”. This study explains how the PV reveals the existance of power oscillations unexplained by simple mathematical models used in the basic circuit theory. It sheds light on the puzzling situation where the PV exists but does not transfer energy and also presents some examples that reinforce the usefulness of PV as a fine tool in understanding the flow and the components of electromagnetic energy.
5
Content available A Poynting Vector Approach to the Study of Power Flow through a Transformer
Todeschini G., Emanuel A. E.
Electrical Power Quality and Utilisation. Journal
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2007
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Vol. 13, nr 1
129-137
EN
This work deals with the flow of the electromagnetic energy through an idealized single-phase transformer supplied with nonsinusoidal voltage and supplying a nonlinear load. The electromagnetic flux components of the energy that flows from primary to secondary as well as the flux of energy stored in and ejected from the dielectric space surrounding the windings are identified and quantified. The electromagnetic flux components are correlated to well known instantaneous powers. These powers are not clever mathematic expedients but correct expressions that mirror the actual physical phenomena and lead to a more realistic interpretation of apparent power and its resolution.
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