264 Practical MATLAB® Applications for Engineers
R.3.84 The magnitude of the line currents in a balanced 3 Φ system, as well as the voltage
drops across the loads are equal, and the phases are evenly spaced by 120°.
R.3.85 The magnitude of the voltages and currents in an unbalanced 3 Φ circuit can vary
considerably across the load in which the line currents are not equal and the phases
are no longer evenly spaced by 120°.
FIGURE 3.45
3 Φ–∆ system connected to a ∆ load.
Z 6
Z 5
E 2
E 3
E 1
Z 4
FIGURE 3.46
3 Φ–∆ system connected to a Y load.
E 2
E 3
E 1
Z 2 Z 3
Z 1
FIGURE 3.44
3 Φ–Y system connected to a ∆ load.
Z 6
Z 4
E 1 Z 5
E 3
E 2