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Buckling Strength Analysis of Large Power Transformer Windings Subjected to Electromagnetic Force Under Short Circuit

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4 Author(s)
Hiroyuki Kojima ; Mechanical Engineering Research Laboratory, Hitachi, Ltd. ; Hiroshi Miyata ; Shigeru Shida ; Ken'ichi Okuyama

The inner winding of a power transformer is subjected to radial electromagnetic forces under short circuit conditions. When these forces exceed a certain limit, transformer windings buckle. This paper deals with the buckling strength analysis of transformer windings, including the evaluation of the bending stiffness of a winding disk (coil) of multiple turn laminated construction, the effect of supporting spacers on the deformation of a winding and the plastic deformation of a winding caused by circumferential stress.

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IEEE Transactions on Power Apparatus and Systems  (Volume:PAS-99 ,  Issue: 3 )