3-18. A 20-kVA 20,000/480-V 60-Hz distribution transformer is tested with the following results:
| Open-circuit test(measured from secondary side) | Short-circuit test(measured from primary side) |
| VOC = 480 V | VSC = 1130 V |
| IOC = 1.51 A | ISC = 1.00 A |
| VOC = 271 W | PSC = 260 W |
(a) Find the per-unit equivalent circuit for this transformer at 60 Hz.
(b) What would the rating of this transformer be if it were operated on a 50-Hz power system?
(c) Sketch the equivalent circuit of this transformer referred to the primary side if it is operating at 50 Hz.
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