PRACTICAL MATLAB® FOR ENGINEERS PRACTICAL MATLAB

262 Practical MATLAB® Applications for Engineers

R.3.77 3 Φ Systems are the most common confi gurations used to generate and deliver
electrical power. A 3 Φ system, with sequence ABC is shown in Figure 3.42, where
the sequence label indicates the generation path.

R.3.78 The line voltages are the voltages VAN, VBN, and VCN.

R.3.79 The system voltages are referred to as the voltage between any pair of line voltages
such as VAB, VBC, and VCA.

FIGURE 3.39
Single-phase system.

AB VV^0 °

BC VV^0 °

A

B

C

(^0) AC 2 VV 0 °
V °
FIGURE 3.40
Two-phase system.
I
l
E 1 = E 0 °V
E 1 = E 90 °V
ZL
ZL
ZN
Z 1
Z 2
1
2
N
I 1
I 2
IN
FIGURE 3.41
Phasor diagram of Figure 3.40.
E 12 2 E −∠= 45 °
2 EE ∠=^90 °
45 °
1 EE ∠=^0 °