Electrical Transformers and Rotating Machines
4th Edition
ISBN: 9781305494817
Author: Stephen L. Herman
Publisher: Cengage Learning
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Textbook Question
Chapter 12, Problem 1RQ
What is the primary consideration for personnel performing transformer maintenance?
Expert Solution & Answer
To determine
The primary consideration for personnel performing transformer maintenance.
Explanation of Solution
The primary consideration for personnel performing transformer maintenance are as mentioned below.
- The transformer is checked whether it is energized or disenerzied.
- Prepare a written switching process of each step for de-energizing the connections.
- Check all the connections exposed to power supply.
- Use of proper instruments of high voltage rating.
- The atmosphere of transformer tank is checked before entering into the tank for maintenance.
- The gloves and shoes used by personnel must be of good insulation rating.
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First, define the coordinate system XY with its origin at O2 and X-axis passing through O4 asshown above, then based on the provided steps Perform coordinate transformation from XY to xy to get the trajectory of point P. Show all the steps and calcualtions
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Question 2 (40 Points)
Consider the following double pendulum-like system with links ₁ and 12. The angles 0 and & could have
angular velocities ėêk and êk, respectively, where ②k is a unit vector that points out of the page and is
perpendicular to x and y. They could also have angular accelerations Ök and êk. The angle is
defined relative to the angle 0. The link 12 is a spring and can extend or compress at a rate of 12. It can
also have a rate of extension or compression Ï2.
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y
êr1
êe
12
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3
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1) Express the velocity of the mass in terms of the unit vectors ê0, êr1, êø, and êr2, and any
extension/contraction of the links (e.g.,. i; and Ï¿) (12 Points)
2) Express the acceleration of the mass in terms of the unit vectors ê¤, ê×1, êp, and êÃ2, and any
extension/contraction of the links (e.g.,. İ; and Ï¿) (12 Points)
3) Express the velocity of the mass in terms of unit vectors î and ĵ that point in the x and y
directions, respectively. Also include the appropriate,…
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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