Electrical Transformers and Rotating Machines
4th Edition
ISBN: 9781305494817
Author: Stephen L. Herman
Publisher: Cengage Learning
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Chapter 12, Problem 8RQ
What is a special hazard encountered in large industrial transformers used in unit substations?
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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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- A 10 kVA transformer has a primary voltage rating of 240 volts and a secondary voltage rating of 480 volts. The transformer is connected to a circuit protected by a 100 ampere circuit breaker. The secondary is protected by a 25-ampere fuse. Does the primary require separate overcurrent protection?arrow_forwardList some of the protective relays found with large transformers.arrow_forwardBefore opening manholes on large transformers, what material should be available?arrow_forward
- Two transformers rated at 100 kVA each are connected in an open-delta connection. What is the total output power that can be supplied by this bank?arrow_forward5. The operation factor of a unit is 80% and its use factor is 50%. If the load factor and reserve-over-peak are 42% and 3000 kW, respectively, the average load is kW.arrow_forward31 Why the noisepollution is considered a serious occupational health hazard?arrow_forward
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