Two balanced y-connected loads one drawing 20 kw at 08 pf

Question

1. A balanced, three-phase 240-V source supplies a balanced three-phase load. If the line current I_A is measured to be 5 A, and is in phase with the line-to-line voltage V_BC, find the per phase load impedance if the load is

(a) Y-connected, and

(b) ?-connected.

2. Two balanced Y-connected loads, one drawing 20 kW at 0.8 p.f. lagging and the other 30 kW at 0.9 p.f. leading, are connected in parallel and supplied by a balanced three-phase Y-connected, 480-V source. Determine the impedance per phase of each load and the source currents.