# The short-circuit test readings for a 50-kVA 2400:240-V transformer are 48 V, 20.8 A, and 617...

###### Question: The short-circuit test readings for a 50-kVA 2400:240-V transformer are 48 V, 20.8 A, and 617 W, with the instruments located on the high-voltage side and the low-voltage side short- circuited. An open-circuit test with the low-voltage side energized gives instrument readings on that side of 240 V, 5.41 A, and 186 W. 1. Calculate the equivalent parameters of the transformer as referred to the high-voltage side. 2. Draw the equivalent approximate circuit of that transformer referred to the high voltage side. (Label the impedances numerically). 3. If the transformer is to operate at maximum efficiency with 0.8 power factor lagging load, find the load in kVA that should be connected to achieve maximum efficiency if rated voltage is applied at the primary (H.V) side and then find the value of that efficiency.

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