Electric Motor Control
10th Edition
ISBN: 9781133702818
Author: Herman
Publisher: CENGAGE L
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Chapter 2, Problem 7SQ
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Choose the correct option that represents the achievement of an automatic operation for the manual starters.
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A superconducting magnetic energy storage coil is made from a toroidal ring coil (torus). The coil’s cross-sectional radius is d = 1.5 m and radius of the torus is r = 1.5 km. The torus is wound with N = 175,000 turns and is able to carry a current I = 110,000 A. a) Calculate the magnetic flux density in the torus. b) What is the amount of energy stored in the torus? c) If a city requires 500 MW of power how long can this storage ring of this type power the city in case of a blackout in power generation? Assume there are no losses in the conversion of energy from stored DC to AC energy required by standard grids.
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Chapter 2 Solutions
Electric Motor Control
Ch. 2 - If the contacts on a manual starter cannot be...Ch. 2 - If the handle of an installed motor starter is in...Ch. 2 - How may an automatic operation be achieved when a...Ch. 2 - What does the term trip-free mean as it relates to...Ch. 2 - Prob. 5SQCh. 2 - Prob. 6SQCh. 2 - Prob. 7SQCh. 2 - Prob. 8SQCh. 2 - Select the best answer for each of the following....Ch. 2 - Select the best answer for each of the following....
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