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By showing the primary and secondary connections of three single-phase transformers, illustrate the following three-phase transformer connections: starstar, and stardelta. What is the relationship between

By showing the primary and secondary connections of three single-phase transformers, illustrate the following three-phase transformer connections: star–star, and star–delta. What is the relationship between the line voltages (magnitude and phase) at the input and output of a star-delta transformer (if the single-phase transformer winding ratios are 1:1)?

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