Abstract
Transformer windings are forced to move by electromagnetic force caused by short circuit current. The electromagnetic force is proportional to the square of short circuit current. When the electromagnetic force becomes very large, windings tend to be destroyed. Large displacement of windings causes the ampere-turn distribution change, resulting in electromagnetic force change. This leads to the increase in winding displacement. This paper discusses the variation of winding vibration due to the variation of electromagnetic force caused by the movement of winding. Using vibrating systems of one and three degrees of freedom, the effects of the variation of electromagnetic force are analyzed. The vibration of windings increases when the variation of electromagnetic force caused by the movement of winding is taken into account. The nonlinearity of winding stiffness and internal damping reduce the increase of winding vibration.
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