A 20-KVA, 8000/277-V distribution transformer has the following resistances and reactances: Rp = 322 Xp = 4512 Rc = 250 k2 R = 0.0512 X = 0.062 X = 30 k12 The excitation (magnetization Rc, Xm) 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(primary) side. C. Assume that this transformer is supplying rated load at 277 V and 0.8 PF lagging. 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)? e. With rated voltage to the primary, a short circuit occurs on the secondary. Find the primary and secondary currents. Use the simplified model with series impedance Zt ( also called Zeq) referred to the primary, and neglecting RC and Xm