Computing procedure of mutual reactances in multiwinding transformers

A general computing procedure is described for determining the equivalent network of a transformer with two or more concentric windings divided into multiaxial coils. The magnetic field of a transformer is considered and the equations are discretized by means of the finite element method. Taking into account the winding connections the machine equations are written such that the machine mutual reactances can be calculated simultaneously. A three-phase multiwinding transformer is considered, the mutual reactance values of which have been measured. The average discrepancies between the calculated and measured values are less than 10-15 percent.