Record Details

Coupled Electromagnetic-Structural Analysis of the Spiraling Phenomenon in a Helical Winding of a Power Transformer

DSpace at IIT Bombay

View Archive Info
 
 
Field Value
 
Title Coupled Electromagnetic-Structural Analysis of the Spiraling Phenomenon in a Helical Winding of a Power Transformer
 
Creator BAKSHI, A
KULKARNI, SV
 
Subject Finite-element method
helical winding
spiraling
torsional forces
transformers
 
Description Spiraling of conductors in a helical winding of a transformer may lead to a catastrophic failure under the action of torsional short-circuit electromagnetic forces. Torsional forces are produced by the interaction of the axial component of the short-circuit current and the radial component of the leakage magnetic flux density. In this paper, 3-D magnetostatic analysis has been performed to determine the leakage magnetic-field distribution in a 130-MVA power transformer. Torsional electromagnetic forces are calculated from the analysis to determine circumferential displacements of conductors of its low-voltage helical winding. Furthermore, mechanical stress components are computed and a factor of safety is defined, which gives an indication as to whether the winding conductors are in the elastic or plastic zone. The numerical results thus obtained by the finite-element method are verified using the first principles from mechanics. The effect of looseness in the inner support structure on the von-Mises equivalent stress and, hence, on the factor of safety has been studied.
 
Publisher IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
 
Date 2014-12-28T18:07:32Z
2014-12-28T18:07:32Z
2014
 
Type Article
 
Identifier IEEE TRANSACTIONS ON POWER DELIVERY, 29(1)235-240
0885-8977
1937-4208
http://dx.doi.org/10.1109/TPWRD.2013.2276047
http://dspace.library.iitb.ac.in/jspui/handle/100/17067
 
Language English