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EE 340L
A. Equivalent Circuit Parameters
A.1. Open-Circuit Test
(a) Mechanically couple the generator with a series-excited DC motor as shown in
figure 4.1(a & b) Increase the DC supply slowly till the rotor speed reaches 1,800
RPM. The speed of this particular motor is varied by varying supply voltage.
(c) With the generator switch in the SYNC.RUN position, energize the generator
exciter, then raise the field current to 0.1 A, make sure the speed is at rated value,
then record the generator line voltage. Increase the field current to 0.2 A, adjust
the speed and record the phase voltage. Continue with these discrete steps until the
phase voltage reaches 130 V.
(d) When finished, reduce the speed and the field current back to zero, then shut down
the power supply.
A.2. Short-Circuit Test
(a) Repeat steps (a) above. Then short-circuit the output terminals of the generator as
shown in figure 4.2.
(b) Energize the generator exciter. Increase the field current in discrete steps of 0.2 A
Record the short-circuit current and field current at each step, until the
short-circuit current reaches 3 A.
A.3. DC Test
(a) Connect a variable DC supply across two phases of the synchronous generator.
(b) Start with 0 V then increase the DC voltage until the DC current reaches 3A.
Record the corresponding voltage.
B. Isolated Operation
Bring the shaft speed to 1800 rpm, then energize the exciter and increase the
field current until the generator line voltage reaches 208 V under no-load.
B.1 Resistive Load
Connect a 3-phase Y-connected resistive load (600Ω in each phase) across the
generator terminals as illustrated in Figure 4.3. Adjust the speed back to 1800
RPM. Record the line voltage, load current, total active and reactive powers
Note the drop in voltage.
Repeat the above step for loads of 300Ω, 200 Ω, 150 Ω, 100 Ω and 85 Ω.
Make sure the speed is maintained at 1800 rpm for each load.
B.2 Inductive Load
Repeat the above step for an inductive load, by starting with 208V under
no-load. Then connect 1.6 H, 0.8 H, .533 H, .4 H, .266 H, and finally .228 H.
Make sure the speed is maintained at 1800 rpm for each load.
B.3 Capacitive Load
Repeat the above step for a capacitive load, by starting with 208V under
no-load. Then connect 4 uF, 8 uF, 12uF, 16uF , 20uF, and finally 24uF . Make
sure the speed is maintained at 1800 rpm for each load.
Decrease the motor speed to minimum value, disconnect the load from the
generator terminals, decrease the generator field current to zero, then turn off
the power supply.
A. Equivalent Circuit:
1. Plot the generator saturation curve from the open-circuit test.
2. Plot the short-circuit current versus the field current from the short circuit test.
3. Use the results of the no-load, short-circuit and DC tests to find the internal
impedance of the generator.
4. Suppose that the generator under test is short-circuited when the line voltage is
208 V. Determine an approximate value of the short-circuit current under this
B. Isolated Operation:
1. Calculate the internal voltage phasor E for each resistive load. Plot the voltage
regulation curve (terminal voltage versus load current).
2. Repeat the above for the the inductive load.
3. Repeat the above for the capacitive load.
Fig. 4.1(a)
Fig. 4.1(b)
Fig. 4.2
Fig. 4.3
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