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3 Phase Autotransformer Wiring Diagram engrask ca classes EE 392 Lab Guides 6 3Phase Transformers pdfEE CME 392 Laboratory 6 6 Figure 3 3 Equivalent circuit of a transformer 3 2 Load Test on Three Phase Transformer Using the three similar single phase transformers see ones that you used in step 1 make a 3 Phase Autotransformer Wiring Diagram engineering portal autotransformer A autotransformer connection is theoretically possible however this will create a peculiar phase shift The phase shift is a function of the ratio of the primary to secondary voltages and it can be calculated from the vector diagram This phase shift cannot be changed or eliminated and for this reason autotransformers are very seldom phase electric powerA split phase or single phase three wire system is a type of single phase electric power distribution It is the AC equivalent of the original Edison three wire direct current system Its primary advantage is that it saves conductor material over a si...