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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)
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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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
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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