A single-phase, 20-kVA, 20,000/480 V, 60Hz distribution transformer is tested with the following results: VOC=480V VSC=1130 V IOC=1.60 A ISC= 1A POC= 305 W PSC= 260W a. Find the equivalent circuit referred to the low-voltage side. Hint: First find out whether the tests above are referred to the LV or HV side. b. Find the equivalent circuit referred to the high-voltage side. c. Find the equivalent circuit in pu

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A single-phase, 20-kVA, 20,000/480 V, 60Hz distribution transformer is tested with the following
results:

VOC=480V VSC=1130 V
IOC=1.60 A ISC= 1A
POC= 305 W PSC= 260W

a. Find the equivalent circuit referred to the low-voltage side. Hint: First find out whether the tests
above are referred to the LV or HV side.
b. Find the equivalent circuit referred to the high-voltage side.
c. Find the equivalent circuit in pu

d. Use the equivalent circuit referred to the low-voltage side, find the voltage regulation and the
efficiency of the transformer for full load, 0.85 pf lagging.
e. Repeat d in pu.

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