EBK ELECTRIC MOTOR CONTROL
10th Edition
ISBN: 9780100784598
Author: Herman
Publisher: YUZU
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Chapter 56, Problem 3SQ
To determine
Name the device that is suited for maintaining a large difference in the input and output speed and explain the reason.
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Q1. What is power dissipation in the Zener diode circuit given for
a) RL=100 Ohm ?
b) RL=∞
The one-line diagram of an unloaded power system is shown below.
Reactances of the two sections of transmission line are shown on the diagram.
The generators and transformers are rated as follows:
20 MVA, 13.8 kV, X = 0.20 p.u
Generator 1:
Generator 2:
Generator 3:
30 MVA, 18 kV, X = 0.20 p.u
Transformer Ti:
Transformer T2:
30 MVA, 20 kV, X = 0.20 p.u
25 MVA, 220Y/13.8A kV, X = 10%
Three single-phase units each rated 10
MVA, 127/18 kV, X = 10%
HT sides connected in wye
Transformer T3:
LT sides connected in delta
35 MVA, 220Y/22Y KV, X = 10%
j80 Q
j100 Q
Line 1
Line 2
T₁
T₂
Draw the impedance diagram with all reactances marked in per unit. Choose
a base of 50 MVA, 13.8 kV in the circuit of generator 1.
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EBK ELECTRIC MOTOR CONTROL
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- 3. As the audio frequency of Fig. 11-7 goes down, what components of Fig. 12-4 must be modified for normal operation? OD C₂ 100 HF R₁ 300 Re 300 ww 100A R 8 Voc Rz 10k reset output 3 R7 8 Voc 3 reset output Z discharge VR₁ 5k 2 trigger 2 trigger 7 discharge R 3 1k 5 control voltage threshold 6 5 control voltage 6 threshold GND Rs 2k C. C. 100 GND Uz LM555 1 Ce 0.01 U, LM555 0.01 8.01.4 PRO Fig. 11-7 Audio lutput Pulse width modulator R4 1k ww C7 Re 1k ww R7 100 VR 50k 10μ Ra R10 C₁. R1 3.9k 3.9k 0.14 100k TO w Rs 51 82 3 H 10 Carrier U₁ Ca Input A741 2.2 Us MC1496 PWM signal input R2 0.1100k Uz A741 41 Cs 1 Re 10k VR2 50k VR3 100k 14 12 C3. 3% + Ce 0.1 10μ 5 1A HH C +12V 0.1 O PWM Output C 0.02- R 100k +12 V Demodulated output 6 Ca 0.33 w R 10k R12 100k ww 31 о + 4A741 -12 V Fig. 12-4 PWM demodulator C 1500parrow_forwardDUC 1. In Fig. 12-4, what are the functions of the VR1 and VR2? 2. In Fig. 12-4, what is the function of the VR3? VR₁ 50k C₁ R1 0.1 100k Carrier Input U₁ A741 PWM signal input R41k www Re 1k w C7 ± 10μT R7 100 ww =L H C4 2.2 H W82 Rs 51 3 10 U3 MC1496 C2 R2 U2 A741 22 0.1 100k VR2 50k VR3 100kr 14 C3 10μ 1k 0.1 4 5 6 12 m Re 10k R9 R102 3.9k 3.9k HHI C10 0.1 -0 +12V C11 R 0.02 100k +12 V Demodulated output C R11 R12 A741 0.33 10k 100k -12 V Ca 1μ C12 1500p PRODUC Fig. 12-4 PWM demodulator PRODUCTSarrow_forward10.37 Use mesh analysis to find currents I₁, I2, and I3 in the circuit of Fig. 10.82. ML 120-90° V 120 -30° V Figure 10.82 For Prob. 10.37. N N Z=80-135arrow_forward
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