Eddy current losses and hot-spot evaluation in cover plates of power transformers

1997 ◽  
Vol 144 (6) ◽  
pp. 435 ◽  
Author(s):  
J. Turowski ◽  
A. Pelikant
Keyword(s):  
Eddy Current ◽  
Hot Spot ◽  
Power Transformers ◽  
Eddy Current Losses ◽  
Cover Plates

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

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

Study on eddy current losses and shielding measures in large power transformers

1994 ◽  
Vol 30 (5) ◽  
pp. 3068-3071 ◽  
Author(s):  
Chen Yongbin ◽  
Yang Junyou ◽  
Yu Hainian ◽  
Tang Renyuan
Keyword(s):  
Eddy Current ◽  
Power Transformers ◽  
Large Power ◽  
Eddy Current Losses

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.

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