Electric Motor Control
Electric Motor Control
10th Edition
ISBN: 9781133702818
Author: Herman
Publisher: CENGAGE L
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Chapter 7, Problem 9SQ

What is optoisolation?

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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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In Fig.35 resistive loads, 1, 2, and 3, respectively, absorb 1200 W, 2400 W, and 3600 W. Calculate the current: a. In lines A and B. b. In the neutral conductors. c. In the HV line.
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