Quiz: Separately excited dc generator A separately excited de generator is rated at 172 kW, 430 V, 400 A, and 1800 r/min. It is shown in Figure 8-47, and its magnetization curve is shown in Figure 8-48. This machine has the following characteristics: V = 430 V N 1000 turns per pole R₁ = 0.05 RF = 20 2 Radi=0 to 300 (a) If the variable resistor Rad in this generator's field circuit is adjusted to 63 N and the generator's prime mover is driving it at 1600 r/min, what is this generator's no-load terminal voltage? (b) What would its voltage be if a 360-A load were connected to its terminals? As- sume that the generator has compensating windings. (c) What would its voltage be if a 360-A load were connected to its terminals but the generator does not have compensating windings? Assume that its armature reaction at this load is 450 A turns. 500 450 430 410 410 400 300 200 100 UTHM Universiti Tun Hussein Onn Malaysia
Quiz: Separately excited dc generator A separately excited de generator is rated at 172 kW, 430 V, 400 A, and 1800 r/min. It is shown in Figure 8-47, and its magnetization curve is shown in Figure 8-48. This machine has the following characteristics: V = 430 V N 1000 turns per pole R₁ = 0.05 RF = 20 2 Radi=0 to 300 (a) If the variable resistor Rad in this generator's field circuit is adjusted to 63 N and the generator's prime mover is driving it at 1600 r/min, what is this generator's no-load terminal voltage? (b) What would its voltage be if a 360-A load were connected to its terminals? As- sume that the generator has compensating windings. (c) What would its voltage be if a 360-A load were connected to its terminals but the generator does not have compensating windings? Assume that its armature reaction at this load is 450 A turns. 500 450 430 410 410 400 300 200 100 UTHM Universiti Tun Hussein Onn Malaysia
Chapter3: Magnetic Starters
Section: Chapter Questions
Problem 18SQ
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Transcribed Image Text:Quiz: Separately excited dc generator
A separately excited dc generator is rated at 172 kW, 430 V, 400 A,
and 1800 r/min. It is shown in Figure 8-47, and its magnetization curve is shown in
Figure 8-48. This machine has the following characteristics:
R₁ = 0.05
RF = 20 2
Radj=0 to 300
V₂ = 430 V
N = 1000 turns per pole
(a) If the variable resistor Rad in this generator's field circuit is adjusted to 63 2 and
the generator's prime mover is driving it at 1600 r/min, what is this generator's
no-load terminal voltage?
(b) What would its voltage be if a 360-A load were connected to its terminals? As-
sume that the generator has compensating windings.
(c) What would its voltage be if a 360-A load were connected to its terminals but
the generator does not have compensating windings? Assume that its armature
reaction at this load is 450 A turns.
(d) What adjustment could be made to the generator to restore its terminal voltage
to the value found in part a?
(e) How much field current would be needed to restore the terminal voltage to its
no-load value? (Assume that the machine has compensating windings.) What is
the required value for the resistor Radj to accomplish this?
amina patria fu
500
450
430
410
400
300
200
100
0
0.0
1.0
2.0
3.0
4.0 5.0
4.75
6.0
7.0
5.2
Field current, A
Note: When the field current is zero, EA is about 3 V.
6.15
8.0
JUTHM
Universiti Tun Hussein Onn Malaysia
9.0
10.0
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