TRANSFORMER THEORY TransformersSummaryThe important information covered in this chapter is summarized below.Transformer Theory SummaryThe induction of an EMF in a coil by magnetic flux lines generated inanother coil is called mutual induction.The turns ratio is defined as the ratio of turns of wire in the primarywinding to the number of turns of wire in the secondary winding.The ratio between the primary and secondary impedances is referred to asthe impedance ratio.Efficiency of a transformer is the ratio of the power output to the powerinput.In a delta connection, all three phases are connected in series to form aclosed loop.In a wye connection, three common ends of each phase are connectedtogether at a common terminal, and the other three ends are connected to athree-phase line.In a D connected transformer:VLVfIL3 IfIn a Y connected transformer:IL3 VfILIfES-13 Page 16 Rev. 0
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