Question

1) A 2300 V, 1000 kVA, 0.8 p.f. lagging, 60 Hz, two-pole, \Delta-connected synchronous generator has a synchronous reactance of 1.10 \ohm and an armature resistance of 0.15 \ohm. At 60 Hz, its friction and windage losses are 24 kW and its core losses are 18 kW. The OCC of this generator is shown below. 3000 Open-circuit terminal voltage, V 2700 2400 2100 1800 1500 1200 900 600 300 0.0 1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0 9.0 10.0 Field current, A (a) How much field current is required to make $V_{LL}$ equal to 2300 V when the generator is running at no load? (b) What is the internal generated voltage of this machine at rated conditions? (c) What is the power angle \delta at rated conditions? (d) How much field current is required at rated conditions? (e) Calculate the voltage regulation at rated conditions. (f) Calculate the efficiency at rated conditions. (g) What is the maximum power and torque of the generator? 2) Repeat problem 1 for 50% of rated load at rated voltage at 0.8 p.f. lagging.

          1) A 2300 V, 1000 kVA, 0.8 p.f. lagging, 60 Hz, two-pole, \Delta-connected
synchronous generator has a synchronous reactance of 1.10 \ohm and an armature
resistance of 0.15 \ohm. At 60 Hz, its friction and windage losses are 24 kW and its
core losses are 18 kW. The OCC of this generator is shown below.
3000
Open-circuit terminal voltage, V
2700
2400
2100
1800
1500
1200
900
600
300
0.0
1.0
2.0
3.0
4.0
5.0
6.0
7.0
8.0
9.0 10.0
Field current, A
(a) How much field current is required to make $V_{LL}$ equal to 2300 V when the
generator is running at no load?
(b) What is the internal generated voltage of this machine at rated conditions?
(c) What is the power angle \delta at rated conditions?
(d) How much field current is required at rated conditions?
(e) Calculate the voltage regulation at rated conditions.
(f) Calculate the efficiency at rated conditions.
(g) What is the maximum power and torque of the generator?
2) Repeat problem 1 for 50% of rated load at rated voltage at 0.8 p.f. lagging.

1) A 2300 V, 1000 kVA, 0.8 p.f. lagging, 60 Hz, two-pole, Δ-connected
synchronous generator has a synchronous reactance of 1.10 and an armature
resistance of 0.15 . At 60 Hz, its friction and windage losses are 24 kW and its
core losses are 18 kW. The OCC of this generator is shown below.
3000
Open-circuit terminal voltage, V
2700
2400
2100
1800
1500
1200
900
600
300
0.0
1.0
2.0
3.0
4.0
5.0
6.0
7.0
8.0
9.0 10.0
Field current, A
(a) How much field current is required to make VLL equal to 2300 V when the
generator is running at no load?
(b) What is the internal generated voltage of this machine at rated conditions?
(c) What is the power angle δat rated conditions?
(d) How much field current is required at rated conditions?
(e) Calculate the voltage regulation at rated conditions.
(f) Calculate the efficiency at rated conditions.
(g) What is the maximum power and torque of the generator?
2) Repeat problem 1 for 50% of rated load at rated voltage at 0.8 p.f. lagging.

Added by Thomas H.

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