Q2-a three-phase y-a transformer is rated 225-kv: 24-kv, 400 mva and has a series reactance of 6.08 ohms as referred to its high-voltage terminals. the transformer is supplying a load of 375 mva, with 0.89 power factor lagging at a voltage of 24 kv (line-to-line) on its low-voltage side. it is supplied from a feeder whose impedance is 0.17 + j 2.2 ohms connected to its high-voltage terminals. the total load in the system remains constant at 375 mva. a- plot the line-to-line voltage which must be applied to the sending end of the feeder to maintain the load voltage at 24 kv line-to-line for load power factors in range from 0.3 lagging to unity to 0.3 leading. b-plot the sending-end voltage as a function of power factor angle.