PRACTICAL MATLAB® FOR ENGINEERS PRACTICAL MATLAB

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