Electrical terminal representation of conductor loss in transformers

The formulation of a general, complete electrical terminal representation of eddy-current loss in transformer windings is presented. It is shown that the effects of mutual resistances must be considered in addition to the familiar winding resistances (self resistances) for a complete description of eddy-current loss. A simple two-foil winding structure is analyzed to display the features of the self- and mutual-resistance terms. The example illustrates that leakage resistance, i.e. resistance associated with opposing winding currents of equal amp turns, provides only a partial description of eddy-current loss. The analysis is extended to multiple windings, with a simple three-foil winding structure as an example