A balanced three-phase distribution line has an impedance of This line is used to suppl...

A balanced three-phase distribution line has an impedance of This line is used to supply three balanced three-phase loads that are connected in parallel. The three loads are L₁ = 180 kVA at 0.866 pf lag, L₂ = 150 kVA at 0.28 pf lead, and L₃ = 72.12 kW at unity pf. The magnitude of the line voltage at the terminals of the loads is

a) What is the magnitude of the line voltage at the sending end of the line?

b) What is the percent efficiency of the distribution line with respect to average power?