Field simulation of forces on windings in a transformer for electric arc furnace
The finite element model of a three-phase transformer for and electric arc furnace (EAF) is developed. The distribution of radical and axial force components acting on primary winding are computed by means of a finite element analysis of the magnetic field both in the short-circuit case and at the insertion at no-load in order to compare the two cases. The traditional approach to the windings design is based on the evaluation od short-circuit stress. For an EAF transformer, the operation of which is characterised by several insertions per day, this design criterion seems to be insufficient to ensure mechanical stability of windings in switch-on condition. The mechanical inrush current is fully investigated.
simulation transformers furnaces finite element method