Problem + Hard 84-1    Source:  Problem prepared by the author of the site.

In the Figure 84-1.1 we have the circuit where the phase sequence is inverse or acb. It is known that V_an = 240∠0° V, V_bn = 240∠120° V and V _cn = 240∠-120° V. In addition we have Z_A = 8 + j27 Ω, Z_B = 18 + j17 Ω, Z _C = 18 - j43 Ω and Z_L = 2 + j3 Ω. Determine:

a) the line currents.

b) the voltages on the load of each phase.

c) the voltage V_Nn.

Problem + Hard 84-2    Source:  Problem prepared by the author of the site.

Regarding the previous problem calculate:

a) the line voltages over the load.

b) the apparent, average and reactive power in the load.

c) determine the power factor of the load.

d) make a phasor diagram of the currents and voltages involved in solving the problem.