Evaluation of eddy losses due to high current leads in transformers

Calculation of Eddy Current Field in the Ascending Flange for the Bushings and Tank Wall of a Large Power Transformer

“…The Coulomb gauge condition is introduced. The boundary conditions are in (3) in (4) in (5) Introducing the boundary conditions, the weighted residue equation can be written as in (6) in (7) where is the weighted function. In the model the uniqueness condition is satisfied.…”

“…Even the clamp plates in the transformer being studied are made of steel with low magnetic permeability and a shield is installed on the inside surface of the ascending flange of the bushings to alleviate the overheating problem, they are not very effective in reducing the losses [6], [7]. In this paper a 3-D open boundary eddy current field induced by the heavy winding and terminal lead current of the transformer being studied is computed and reported.…”

Numerical Analysis of Eddy Current Field in the Ascending Flange for the Bushings and Tank Wall of a Large Transformer

“…Introducing the boundary conditions, the weighted residue equation can be written as: I (yVxNi VxA+vV*NiV*A+jwtoNi A+ inV (6) oNi Vq5-Ni Js)dv=O fv VN. (jwcu A+ V V %)dv =O in V1 (7) where Ni is the weighted function.…”

“…Even the clamp plates in the transformer being studied are made of steel with low magnetic permeability and a shield is installed on the inside surface of the ascending flange of the bushings to alleviate the overheating problem, they are not very effective in reducing the losses [6] [7]. In this paper a 3D open boundary eddy current field induced by the heavy winding and terminal lead current of the transformer being studied is computed and reported.…”

Error analysis and Hertz vector approach for an electromagnetic interaction between a line current and a conducting plate

“…To compute this kind of integrals, an efficient but rather complicated method was proposed earlier by Poritsky and Jerrard [8]. Later, this method was also considered in other works dealing with similar oscillatory integrals [4,9], but no details were made available on its numerical implementation. A totally different and more direct method is proposed below.…”