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Analysis of slots in horizontal plates of T-beams in shell-form power transformers

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Title Analysis of slots in horizontal plates of T-beams in shell-form power transformers
 
Creator MAGDALENO-ADAME, S
OLIVARES-GALVAN, JC
KULKARNI, SV
ESCARELA-PEREZ, R
 
Subject Eddy currents
Stray losses
FEM
Merritt coil
T-beams
Magnetic shunts
Stray field
Uniform magnetic field
FINITE-ELEMENT-METHOD
EDDY-CURRENT LOSSES
COVER PLATES
STRAY LOSSES
REDUCTION
GEOMETRY
TANK
 
Description A systematic analysis of the use of slots to reduce stray losses in the horizontal plates of the T-beams in shell-form power transformers is presented. In the paper, the horizontal plate of T-beams is modeled as a rectangular stainless steel plate subjected to a perpendicular uniform magnetic field generated by a Merritt coil. The results are compared with the values given by an analytical formula for calculating the losses in a stainless steel plate without slots. The following important design alternatives are analyzed and discussed: (1) plates with rounded slots; (2) plates with unrounded slots; (3) effect of width and length of one slot; (4) effect of the distance between slots; (5) effect of number of slots. It has been found that substantial loss reduction can be obtained when drilling a few slots. Measurements of flux densities were done for seven shell-form power transformers. Using the measurements we calculated the losses in the plates using formula. Using the results of the design alternatives the efficiency of the use of slots in plates of real T-beams was demonstrated. Finally, a structural analysis was made to study the impact of slots in an experimental slotted T-beam. (C) 2013 Elsevier B.V. All rights reserved.
 
Publisher ELSEVIER SCIENCE SA
 
Date 2014-10-15T17:08:15Z
2014-10-15T17:08:15Z
2013
 
Type Article
 
Identifier ELECTRIC POWER SYSTEMS RESEARCH, 10188-95
http://dx.doi.org/10.1016/j.epsr.2013.03.007
http://dspace.library.iitb.ac.in/jspui/handle/100/15289
 
Language en