A 10-kVA single-phase power transmission system is shown in the figure below. The impedance of the transmission line is Zline = 6371 Ω. The load impedance is Zload = 5.836 + 9j Ω. We choose the power base value of 10 kVA and the voltage base value of 480 V at the 480 V input. The two transformers are assumed to be ideal.
a. Find the base values of voltage, current, and impedances at the different zones separated by the transformers in the transmission system.
b. Draw the per-unit equivalent circuit.
c. Find the current Is, Iline, and IL in per unit and in Amperes.
Is = 480V/4800V Z = 6371
4800V/240V IL
Iline = 480 V
Load Z = 5.836 + 9j