Electrical Transformers and Rotating Machines
4th Edition
ISBN: 9781305494817
Author: Stephen L. Herman
Publisher: Cengage Learning
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Chapter 12, Problem 14RQ
What amount of water in transformer oil is considered acceptable for units operating at less than 288 kV?
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A 228 V/ 111 V single-phase transformer has a core loss of 110 W and the no-load current is 0.7 A. The no load power factor is
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A 2 kV / 229 V transformer has the secondary turns of 47. The number of Primary turns of a transformer is given by,
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For the given power transfer, a delta system is associated with larger line currents and a star system is associated with a larger line voltage.
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The discharge pressure of a refrigerant
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The discharge pressure of a refrigerant
should be as low as possible
The discharge pressure of a refrigerant
should be as high as possible
Chapter 12 Solutions
Electrical Transformers and Rotating Machines
Ch. 12 - What is the primary consideration for personnel...Ch. 12 - What are the basic steps of transformer...Ch. 12 - Why is it important to keep accurate records of...Ch. 12 - What environmental conditions affect the life of a...Ch. 12 - What factors govern the type of maintenance...Ch. 12 - What tests must be made before entering a...Ch. 12 - What devices and procedures should be used to...Ch. 12 - What is a special hazard encountered in large...Ch. 12 - List some of the protective relays found with...Ch. 12 - Before opening manholes on large transformers,...
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