Electrical Transformers and Rotating Machines
4th Edition
ISBN: 9781305494817
Author: Stephen L. Herman
Publisher: Cengage Learning
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Chapter 12, Problem 9RQ
List some of the protective relays found with large transformers.
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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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- Name two ways of increasing the cooling of oil-cooled transformers.arrow_forwardA large motor has a full load current rating of 425 amperes. Current transformers with a ratio of 600:5 are used to reduce the current to the overload heaters. What should be the full load current rating of the overload heaters?arrow_forwardWhat are two types of cooling medium used in transformers?arrow_forward
- What is one advantage of shell-type construction in small control transformers?arrow_forwardHow are larger control transformers supplying a motor control center usually cooled?arrow_forwardWhy is it necessary to permit a solder melting type of overload relay to cool for two to three minutes after it has tripped?arrow_forward
- What is a special hazard encountered in large industrial transformers used in unit substations?arrow_forwardWhat factors govern the type of maintenance procedures and the maintenance intervals for transformers?arrow_forwardThe large interconnecting line between the indoor and outdoor coil is the _____line.arrow_forward
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