In a balanced three-phase system, the source is a balanced Y with an abc phase sequence an...

In a balanced three-phase system, the source is a balanced Y with an abc phase sequence and a line voltage . The load is a balanced Y in parallel with a balanced Δ.The phase impedance of the Y is 4 + j3 Ω/ϕ and the phase impedance of the Δ is 3 − j9 Ω/ϕ. The line impedance is 1.4 + j0.8 Ω/ϕ. Draw the single phase equivalent circuit and use it to calculate the line voltage at the load in the a-phase.