Three single-phase transformers rated at 15kVA, 480V/120V,60Hz are connected in delta to function as autotransformers on a 600V,3-phase line. The H1,H2,X1,X2 polarity marks appear on the metal housing.
a. Show how the transformers should be connected.
b. Determine the 3-phase voltage output of the transformer.
c. Determine the phase shift between the 3-phase voltage output and the 600V,3-phase input.