Earth Is the Lords
5th Edition
ISBN: 9781121660069
Author: Caldwell, Taylor
Publisher: MCG/CREATE
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Textbook Question
Chapter 2, Problem 2.24P
Figure P2-4 shows a one-line diagram of a power system consisting of a three-phase, 480-V, 60-Hz generator supplying two loads through a transmission line with a pair of transformers at either end. (NOTE: One-line diagrams are described in Appendix A, the discussion of three-phase power circuits.)
FIGURE P2-4
A one-line diagram of the power system of Problem 2-24. Note that some impedance values are given in the per-unit system, while others are given in ohms.
- Sketch the per-phase equivalent circuit of this power system.
- With the switch opened, find the real power P, reactive power Q, and apparent power S supplied by the generator. What is the power factor of the generator?
- With the switch closed, find the real power P, reactive power Q, and apparent power S supplied by the generator. What is the power factor of the generator?
- What are the transmission losses (transformer plus transmission line losses) in this system with the switch open? With the switch closed? What is the effect of adding Load 2 to the system?
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List and describe three (3) losses that occur in power transformers.
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Now that a 1:15 step-up transformer is installed at the output of the generator and a 15: 1transformer is installed at the end of the transmission line, as depicted in Figure Q3(b).
(i)Determine the new load voltage/generated voltage ratioand power loss in the transmission line.
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Chapter 2 Solutions
Earth Is the Lords
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