Three balanced three-phase loads are connected in parallel. Load 1 is Y-connected with an...

Three balanced three-phase loads are connected in parallel. Load 1 is Y-connected with an impedance of 400 + j300 Ω/ϕ load 2 is Δ-connected with an impedance of 2400 – j1800 Ω/ϕ and load 3 is 172.8 + j2203.2 kVA. The loads are fed from a distribution line with an impedance of 2 + j16 Ω/ϕ. The magnitude of the line-to-neutral voltage at the load end of the line is 24 kV.

a) Calculate the total complex power at the sending end of the line.

---

b) What percentage of the average power at the sending end of the line is delivered to the loads?