THE ANALYSES OF DYNAMIC SHORT CIRCUIT FORCES IN LARGE TRANSFORMERS

摘要

The coupled problem of transient eddy current fields, dynamic short circuit(SC) forces, and mechanical displacement of coils in large power transformers is analyzad. The differences between dynamic and static forces and the effects of the prepressing forces on the axial stability of windings are studied. Furthermore,the impacts of the maximum displacement of coil-sections due to the SC forces on the leakage magnetic fields are analyzed on basis of the computation of 3D transient eddy current field.