Evaluation of eddy current losses in the cover plates of distribution transformers

2004 ◽  
Vol 151 (5) ◽  
pp. 313-318 ◽  
Author(s):  
S.V. Kulkarni ◽  
J.C. Olivares ◽  
R. Escarela-Perez ◽  
V.K. Lakhiani ◽  
J. Turowski
Keyword(s):  
Eddy Current ◽  
Eddy Current Losses ◽  
Distribution Transformers ◽  
Cover Plates

scholarly journals Electromagnetic Analysis and Comparison of Conventional-Wound Cores and Octagonal-Wound Cores of Distribution Transformers

2010 ◽  
Vol 670 ◽  
pp. 477-486 ◽  
Author(s):  
I. Hernández ◽  
J.M. Cañedo ◽  
J.C. Olivares-Galván ◽  
Pavlos S. Georgilakis
Keyword(s):  
Eddy Current ◽  
Electromagnetic Analysis ◽  
Excitation Current ◽  
3D Fem ◽  
Electrical Steels ◽  
Eddy Current Losses ◽  
Distribution Transformers ◽  
Core Losses ◽  
Comparative Results ◽  
2D And 3D

This paper presents comparative results of an electromagnetic study performed in two different wound core transformer configurations in order to know the best configuration that reduce excitation current and core losses. The results show that octagonal wound-core (OWC) reduces the excitation current and eddy-current losses with respect conventional-wound core (CWC). The results were obtained applying 2D and 3D FEM simulations, taking into account the non-linear properties of the core. In the last part of this paper, several grades of grain oriented electrical steels and the combination of them are analyzed to find the best mixing percentage to reduce eddy-current losses and excitation current.

Non-linearity of Hysteresis and Eddy Current Losses of Single-phase Distribution Transformers

2021 ◽  
Author(s):  
Filipe Freire Santos ◽  
Gustavo Paiva Lopes ◽  
Estacio Tavares Wanderley Neto ◽  
Jansen Paula Villibor ◽  
Gabriel Henrique Faria ◽  
...  
Keyword(s):  
Eddy Current ◽  
Single Phase ◽  
Phase Distribution ◽  
Eddy Current Losses ◽  
Distribution Transformers

Improved design of cover plates of power transformers for lower eddy current losses

1999 ◽  
Vol 35 (5) ◽  
pp. 3529-3531 ◽  
Author(s):  
Dong-Hun Kim ◽  
Song-Yop Hahn ◽  
Sang-Young Kim
Keyword(s):  
Eddy Current ◽  
Power Transformers ◽  
Eddy Current Losses ◽  
Improved Design ◽  
Cover Plates

Determination of eddy current losses and hysteresis losses in magnetic circuits of electrical machines

2020 ◽  
pp. 54-58
Author(s):  
S. M. Plotnikov
Keyword(s):  
Eddy Current ◽  
Magnetization Reversal ◽  
Eddy Currents ◽  
Technical Problem ◽  
Electrical Machines ◽  
Eddy Current Losses ◽  
Hysteresis Losses ◽  
Magnetic Circuits ◽  
Core Losses ◽  
Reversal Frequency

The division of the total core losses in the electrical steel of the magnetic circuit into two components – losses dueto hysteresis and eddy currents – is a serious technical problem, the solution of which will effectively design and construct electrical machines with magnetic circuits having low magnetic losses. In this regard, an important parameter is the exponent α, with which the frequency of magnetization reversal is included in the total losses in steel. Theoretically, this indicator can take values from 1 to 2. Most authors take α equal to 1.3, which corresponds to the special case when the eddy current losses are three times higher than the hysteresis losses. In fact, for modern electrical steels, the opposite is true. To refine the index α, an attempt was made to separate the total core losses on the basis that the hysteresis component is proportional to the first degree of the magnetization reversal frequency, and the eddy current component is proportional to the second degree. In the article, the calculation formulas of these components are obtained, containing the values of the total losses measured in idling experiments at two different frequencies, and the ratio of these frequencies. It is shown that the rational frequency ratio is within 1.2. Presented the graphs and expressions to determine the exponent α depending on the measured no-load losses and the frequency of magnetization reversal.

Losses in ac of BSCCO-2223 superconducting monofilament and multifilament tapes at power frequencies

1997 ◽  
Vol 12 (11) ◽  
pp. 3085-3089
Author(s):  
S. Mench ◽  
M. Lelovic ◽  
T. Deis ◽  
N. G. Eror ◽  
U. Balachandran ◽  
...  
Keyword(s):  
Eddy Current ◽  
Anisotropy Field ◽  
Magnetic Losses ◽  
Field Orientation ◽  
Eddy Current Losses ◽  
Order Of Magnitude

The ac magnetic losses at power frequencies (60 Hz) were investigated for mono- and multifilament Ag-sheathed (Bi, Pb)2Sr2Ca2Cu3Oy (BSCCO-2223) tapes with similar Ic values at 77 K. The multifilament sample exhibited higher losses than the monofilament under the same conditions. Loss peaks are discussed in terms of intergranular, intragranular, and eddy current losses. Because of BSCCO's anisotropy, field orientation has a large effect on the magnitude of these peaks, even at relatively small angles. Losses for fields applied parallel to the c-axis of the textured BSCCO grains are larger by over an order of magnitude than those applied perpendicular.

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