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E CA = 150 V ∠ v 3
b. Vf � EL.Therefore, Vab � EAB Vca � ECA Vbc � EBC The phase currents are
Vab 150 V �0° 150 V �0°
Iab ����� ��� �15 A ��53.13°
Zab 6 ��j 8 � 10 � �53.13°
Vbc 150 V ��120°
Ibc ����� �15 A ��173.13°
Zbc 10 � �53.13°
Vca 150 V ��120°
Ica ����� �15 A �66.87°
Zca 10 � �53.13°
c. IL � �3�If � (1.73)(15 A) � 25.95 A. Therefore,
IAa � IBb � ICc � 25.95 A
22.7 THE D-CONNECTED GENERATOR
A
3-phase, 3-wire,
Y-connected generator
Phase sequence: ABC
B
C
If we rearrange the coils of the generator in Fig. 22.16(a) as shown in
Fig. 22.16(b), the system is referred to as a three-phase, three-wire,
C
A
e AN
eCN +
–
N
–
N
N –
eBN +
(a)
+
B
I Aa
E AB = 150 V ∠ 0°
I Bb
I Cc
X L = 8 �
c
+
E BC = 150 V ∠ v 2
FIG. 22.15
Example 22.2.
I AC
C
–
E CA
+
FIG. 22.16
D-connected generator.
R = 6 �
V ca
–
+
–
THE D-CONNECTED GENERATOR ⏐⏐⏐ 987
I ca
R = 6 �
A
– +
E CN E AN
E BN
a
– +
V bc
–
+
I ab
V ab
R = 6 �
I bc XL = 8 �
(b)
E AB
X L = 8 �
I BA I Aa
+
Load
I Bb
– + B
EBC ICB ICc –
+
–
b