Consider the system shown in Figure 1. Assume the load voltage (VL) is 4720 V and the load consumption is 80 kVA at 0.85 lagging power factor. The line impedance (Zline) is 4.6+j8.5 . The parameters of the 14,400/4800-V single-phase transformer referred to the secondary are: Req=0.95 , Xeg = 1.74 , Re = 48.5 kn, and Xm = 31.1 k. vp als Vs V₁ P a:1 atf 4.6 +19.5 r Zline Vz zí S Figure 1: System for Q1 I and .as/41. 7452 a) Find the current of the load. b) Find the primary and secondary voltages of the ideal transformer. ^^^ mie 15 Vt 4720 Powerlostere ->Pont

2. Given three identical ideal single-phase transformers with each rated at 100KVA and 7kV/3.5kV, they are connected as a three-phase transformer bank. The three-phase transformer has high voltage side connected in delta and the low voltage side is connected in wye. A three-phase 200KVA, wye connected load is connected at the low voltage side of the transformer. Calculate the following: a. Rated line-to-line voltage on each side b. Line current on each side of the transformer

A short transmission line connects a step-up transformer on the source side with a series impedance of j0.5 ohms (referred to the primary) to a step-down transformer on the load side with a series impedance of 50 ohms (referred to the primary). The turn ratio of the step-up transformer is 1:10 and a no-load primary voltage of 13.2 (line-to-line) kV. The step-down transformer has a turn ratio of 15:1 and it has a Y-connected, balanced load of 0.667 +j 0.111 ohms connected to its secondary side. A capacitor bank of -j0.239  ohms is added parallel to the load. Assuming an ideal transmission line, the load voltage (line-to-neutral) would be:         A. 5118 V   B. 6.2 kV   C. 8865 V   D. None of the other choices are correct   E. 4225 V