2-2. A 20-kVA 8000/480-V distribution transformer has the following resistances and reactances: Rp = 32 Rs = 0.05 N Xp = 45 2 Rs = 0.06 N Rc = 250 kn Χμ = 30 ΚΩ The excitation branch impedances are given referred to the high-voltage side of the transformer. (a) Find the equivalent circuit of this transformer referred to the high-voltage side. (b) Find the per-unit equivalent circuit of this transformer. (c) Assume that this transformer is supplying rated load at 480 V and 0.8 PF lag- ging. What is this transformer's input voltage? What is its voltage regulation? (d) What is the transformer's efficiency under the conditions of part (c)?