Determine the kilovolt-ampere and voltage ratings of a Y connected transformer to power a three-phase Y-connected load

Question:

Determine the kilovolt-ampere and voltage ratings of a Δ–Y connected transformer to power a three-phase Y-connected load drawing 600-A line current at 480 V from a three-phase, 4160-V source using:

(i) One 3-phase transformer, or 

(ii) Three single-phase transformers.

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