TRANSFORMER THEORY TransformersTABLE 1: Voltage and Current Ratings of TransformersTransformerConnection(Primary toSecondary)PrimarySecondaryLinePhaseLinePhaseVolt.CurrentVolt.CurrentVolt.*CurrentVolt.CurrentD-DVIVI3VaaIVaaI3Y-YVIV3IVaaIV3 aaIY-DVIV3IV3 a3 aIV3 aaID-YVIVI33 VaaI3VaaI3*a = N_{1}/N_{2};31.73Example 1: If line voltage is 440 V to a 3f transformer bank, find the voltage across eachprimary winding for all four types of transformer connections.D-D: primary voltage = V = 440 voltsY-Y: primary voltage =V34401.73254.3 voltsY-D: primary voltage =V34401.73254.3 voltsD-Y: primary voltage = V = 440 voltsExample 2: If line current is 10.4 A in a 3f transformer connection, find the primary phasecurrent.D-D: primary phase current =I310.41.736 ampsY-Y: primary phase current = I = 10.4 ampsY-D: primary phase current = I = 10.4 ampsES-13 Page 10 Rev. 0

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