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

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

On the Magneto-Heat Coupling Model for Large Power Transformers

2017 ◽  
Vol 22 (3) ◽  
pp. 683-711 ◽  
Author(s):  
Xujing Li ◽  
Shipeng Mao ◽  
Kangkang Yang ◽  
Weiying Zheng
Keyword(s):  
Heat Equation ◽  
Eddy Current ◽  
Maxwell’S Equations ◽  
Energy Exchange ◽  
Maxwell's Equations ◽  
Current Model ◽  
Coupling Model ◽  
Power Transformers ◽  
Weak Formulation ◽  
Large Power

AbstractThis paper studies the magneto-heat coupling model which describes iron loss of conductors and energy exchange between magnetic field and Ohmic heat. The temperature influences Maxwell's equations through the variation of electric conductivity, while electric eddy current density provides the heat equation with Ohmic heat source. It is in this way that Maxwell's equations and the heat equation are coupled together. The system also incorporates the heat exchange between conductors and cooling oil which is poured into and out of the transformer. We propose a weak formulation for the coupling model and establish the well-posedness of the problem. The model is more realistic than the traditional eddy current model in numerical simulations for large power transformers. The theoretical analysis of this paper paves a way for us to design efficient numerical computation of the transformer in the future.

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