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

Introductory Circuit Analysis (13th Edition)

13th Edition

ISBN:9780133923605

Author:Robert L. Boylestad

Publisher:Robert L. Boylestad

Chapter1: Introduction

Section: Chapter Questions

Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...

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Concept explainers

Synchronous Generator

In comparison to an asynchronous generator, it is a machine where the rotor speed is equal to the rotating magnetic field produced by the stator, i.e., mechanical speed is equal to the electrical speed, thus called synchronous, and not asynchronous.

Salient Pole Rotor

Salient pole rotor includes a large number of exposed poles mounted on a magnetic wheel. The construction of a bright pole is as shown in the image on the left. The proposed poles are made of metal laminations. The rotor winding is provided on these poles and is supported by pole shoes.

Question

Please answer this question eng thank you

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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