Basic Engineering Circuit Analysis 11th Edition by David Irwin ,Robert Nelms

Exercise 46

In a balanced three-phase system, the source has an abc -phase sequence and is connected in delta. There are two loads connected in parallel. Load 1 is connected in wye and has a phase impedance of 6 + j 2 . Load 2 is connected in delta and has a phase impedance of 9 + j 3 . The line impedance is 0.6 + j 0.2 . Determine the phase voltages of the source if the current in the a phase of load 1 is I AN = 10 30° A rms.