Consider a transformer rated 15 kVA, single-phase, 480/120 V supplying 9.6- load as shown in the following

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Consider a transformer rated 15 kVA, single-phase, 480/120 V supplying 9.6-Ω load as shown in the following figure (top). In calculations specific to a given transformer, it is customary to take the rated voltage on two sides as their respective base voltage and the rated kilovolt-ampere as the base kilovolt-ampere (which remains the same on both sides). Then, on the secondary (suffix 2) and primary (suffix 1) sides, we have:

12base = 15 KVA x 1000  120 V = 125 A and Z2base = 120 V  125 A = 0.96 0 /1base = 15 KVA x 1000  480 V =

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