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Analysis of short-circuit performance of split-winding transformer using coupled field-circuit approach

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Title Analysis of short-circuit performance of split-winding transformer using coupled field-circuit approach
 
Creator KUMBHAR, GB
KULKARNI, SV
 
Subject electromagnetic field
finite element method
mathematical models
short-circuit current
 
Description The split-winding arrangement requires special short-circuit design considerations. During short-circuit conditions, there is a considerable distortion of the leakage field, which in turn produces high axial short-circuit forces. This paper deals with the computation and analysis of electromagnetic forces in windings of split-winding transformers. A nonlinear-transient field-circuit coupled finite element model is used to simulate the split-winding transformer. A 70-MVA, three-phase, 220/ 6.9/6.9-kV split-winding transformer is modeled under preset and postset short-circuit test conditions. Under the preset condition, the transformer is analyzed with one as well as both the LV windings short circuited to compare the axial forces produced in the windings for these two cases. The results show that there is a considerable rise in the axial forces when one winding is short circuited as compared with the case when both windings are short circuited. The effect of initial magnetization of core on axial short-circuit forces is calculated and discussed. It is also shown that even though postset method eliminates inrush related problems there is not much respite in short-circuit forces.
 
Publisher IEEE
 
Date 2008-12-01T04:56:05Z
2011-11-25T16:11:17Z
2011-12-26T13:05:23Z
2011-12-27T05:52:11Z
2008-12-01T04:56:05Z
2011-11-25T16:11:17Z
2011-12-26T13:05:23Z
2011-12-27T05:52:11Z
2007
 
Type Article
 
Identifier IEEE Transactions on Power Delivery 22(2), 936-43
0885-8977
http://dx.doi.org/10.1109/TPWRD.2007.893442
http://hdl.handle.net/10054/206
http://dspace.library.iitb.ac.in/xmlui/handle/10054/206
 
Language en_US