From a three-phase, 480-V generator switchboard, a feeder takes three phase power to two equipment's at the

Question:

From a three-phase, 480-V generator switchboard, a feeder takes three phase power to two equipment's at the other end—similar to the figure in Example 2.5—via cable and transformer with the combined series impedance Z = 0.04 + j0.09 Ω/phase. The voltage at the receiving end point A rises and falls as a large single-phase, 500-kVA load at point A varies over time. The small 1-kVA load, also connected at point A, remains online continuously and must accommodate the voltage variations at point A with 500-kVA load fully on or fully off. Determine the voltage range that the 1-kVA load will see, over which it must perform within its specifications.

Data from figure in Example 2.5