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So to complete this problem, I get: Zpu = Zactual / Zbase = 75/7500 = .01 Is that correct? Then, for all three phases, what is the total Zpu and Zactual? Are Zpu and Zactual multiplied by 3?

Thanks yellowjacket. I found the article and I like the MVA method for its simplicity. However, I still feel like I need to have an understanding for the PU method for similar problems that provide data on PU basis. The test makers seem to like this and I think I'm finally getting a grasp of it.

Question: In problem 530, the Zpu of the utility = Sbase/Fault Duty. Why does this equation equal a Zpu? I also don't understand what is meant by fault duty. In this problem Zpu = 1MVA/40MVA = .025 How does this equal an impedance?