4.2A 13.8-kV, 50-MVA, 0.9-power-factor-lagging, 60-Hz, four-pole Y-connected synchronous generator hasa synchronous reactance of 2.5 Q and an armature resistance of 0.2N. At 60 Hz, its friction and windagelosses are 1 MW, and its core losses are 1.5 MW. The field circuit has a dc voltage of 120 V, and themaximum I, is 10 A. The current of the field circuit is adjustable over the range from 0 to 10 A. TheOCC of this generator is shown in Figure P4-1.cos (6)-0.S4.3Assume that the field current of the generator in Problem 4-2 has been adjusted to a value of 5 A.(a) What will the terminal voltage of this generator be if it is connected to a A-connected load with animpedance of 24Z25° 2?(b) Sketch the phasor diagram of this generator.(c) What is the efficiency of the generator at these conditions?(d) Now assume that another identical A-connected load is to be paralleled with the first one. Whathappens to the phasor diagram for the generator?(e) What is the new terminal voltage after the load has been added?O What must be done to restore the terminal voltage to its original value?it characteristic I value?it characteristic181614121040.1346.7.8.6.10Field current (A)206900Open-circuit voltage (kV)

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Introductory Circuit Analysis (13th Edition)

13th Edition

ISBN:9780133923605

Author:Robert L. Boylestad

Publisher:Robert L. Boylestad

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4.2
A 13.8-kV, 50-MVA, 0.9-power-factor-lagging, 60-Hz, four-pole Y-connected synchronous generator has
a synchronous reactance of 2.5 Q and an armature resistance of 0.2N. At 60 Hz, its friction and windage
losses are 1 MW, and its core losses are 1.5 MW. The field circuit has a dc voltage of 120 V, and the
maximum I, is 10 A. The current of the field circuit is adjustable over the range from 0 to 10 A. The
OCC of this generator is shown in Figure P4-1.
cos (6)-0.S
4.3
Assume that the field current of the generator in Problem 4-2 has been adjusted to a value of 5 A.
(a) What will the terminal voltage of this generator be if it is connected to a A-connected load with an
impedance of 24Z25° 2?
(b) Sketch the phasor diagram of this generator.
(c) What is the efficiency of the generator at these conditions?
(d) Now assume that another identical A-connected load is to be paralleled with the first one. What
happens to the phasor diagram for the generator?
(e) What is the new terminal voltage after the load has been added?
O What must be done to restore the terminal voltage to its original value?
it characteristic

I value?
it characteristic
18
16
14
12
10
4
0.
1
3
4
6.
7.
8.
6.
10
Field current (A)
20
69
00
Open-circuit voltage (kV)

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Assume that the field current of the generator in Problem 1 is adjusted to achieve rated voltage (13.8
kV) at full load conditions in each of the parts below.
a) What is the efficiency of the generator at rated load

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