Page 246 - Electrical Equipment Handbook _ Troubleshooting and Maintenance

SYNCHRONOUS GENERATORS

SYNCHRONOUS GENERATORS 12.9

FIGURE 12.11 The generator equivalent circuit connected (a) in Y and (b) in .

and resistance in series. The adjustable resistance R controls the field current. The internal
adj
generated voltage for each of the phases is shown in series with the synchronous reactance
X and the stator winding resistance R . The three phases are identical except that the voltages
A
S
and currents are 120° apart in angle.
Figure 12.11 illustrates that the phases can be either Y- or -connected. When they are
Y-connected, the terminal voltage V is related to the phase voltage V by
T

V 3 V
T
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