Transformer per unit calculations

1,500 pts ended

Transformer per unit calculations

Image text transcribed for accessibility: A 20-kVA 8000/480-V distribution transformer has the following resistances and reactances: Rp =32 ohm Rs = 0.05 ohm XP=45 ohm Xs =0.06 ohm Rc= 250 k ohm XM = 30 k ohm The excitation branch impedances are given referred to the high-voltage side of the transformer. Calculate primary side referred values of Rs and Xs and draw the "T" equivalent circuit; Calculate the per-unit values of all the components in the circuit; Assume that the transformer is supplying a rated load at 480 V at 0.8 PF laggering. What is the transformer's input voltage.

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