Excerpt from Determination of the Ratio of Transformation and of the Phase Relations in Transformers
This diagram and the discussion have been based upon the sup position that all the quantities concerned follow a sinusoidal varia tion. In a transformer containing iron this is never realized, for if the applied electromotive force is sinusoidal, the current will not be, owing to the varying permeability of the iron. The discussion remains substantially valid, however, if we let the current vectors in the diagram represent the equivalent sine waves.
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