Transformer and Transformer Vaults

Bijan Ghayour, P.E.

Course Outline

This 4-hour course is intended to cover the specification, design, and application/installation of large and small transformers for different projects. The course provides the necessary rules, minimum basic legal requirements, and guidance for the design, and the installation of transformers. Topics such as overcurrent protection, secondary ties, parallel operation, grounding, guarding, and transformer vaults are discussed.

Special applications such as autotransformers, grounding autotransformers,
les-flammable liquid-insulated, and nonflammable fluid-insulated transformers are also covered.

The course materials are based entirely on the Article 450 of the national Electrical code NFPA 70. It will be necessary for the student to obtain a copy of NFPA 70, 2008 revision.

This course includes a multiple-choice quiz at the end, which is designed to enhance the understanding of course materials.

Learning Objective

The purpose of this course is to make the student familiar with the rules and the code requirements for the design and application large and small transformer in industrial, commercial, government, and utility projects.

At the conclusion of the course the student will be familiar with the:

• Scope of the NFPA 70 Article 450;
• Definition of the terms utilized in NFPA 70 Article 450;
• Overcurrent Protection;
• Autotransformers 600 Volts, Nominal, or Less;
• Grounding Autotransformers;
• Secondary Ties;
• Parallel Operation;
• Guarding;
• Ventilation;
• Grounding;
• Marking;
• Terminal Wire Space;
• Accessibility;
• Dry-Type Transformers Installed Indoors;
• Dry-Type Transformers Installed Outdoors;
• Les-Flammable Liquid-Insulated Transformers;
• Nonflammable Fluid-Insulated Transformers;
• Oil-Insulated Transformers Installed Indoors;
• Oil-Insulated Transformers Installed Outdoors;
• Modification of Transformers; and
• Transformer Vaults.
  

Intended Audience

This course is intended for professional electrical engineers, electrical designers, project engineers, and maintenance personnel involved in the application, specification, design, installation, service, and maintenance of dry-type or oil-insulated transformers.

Benefit to Attendees

This course will assist individuals and organizations in the application of large and small, dry-type or oil-filled transformers. Through explanation of rules and use of the tables the attendee will be able to design and specify transformers in compliance with National Electrical Code NFPA 70.

Course Introduction

This 4-hours course covers the legal requirements for the application of large and small, dry-type or oil-filled transformers, for industrial, commercial, and utility projects. Topics such as overcurrent protection, secondary ties, parallel operation, grounding, guarding, and transformer vaults are discussed.

Special applications such as autotransformers, grounding autotransformers,
les-flammable liquid-insulated, and nonflammable fluid-insulated transformers are also covered.

Course Content

The course materials are based entirely on the Article 450 of the national Electrical code NFPA 70. It will be necessary for the student to obtain a copy of NFPA 70, 2008 revision. A copy of the NFPA 70 could be purchased from the following websites:

http://www.nfpa.com/
http://www.global.ihs.com/

Transformers and Transformer Vaults

NFPA 70, Article 450, Table of Contents

1. Scope
2. General Provisions
3. Definition
4. Overcurrent Protection
5. Autotransformers 600 Volts, Nominal, or Less
6. Grounding Autotransformers
7. Secondary Ties
8. Parallel Operation
9. Guarding
10. Ventilation
11. Grounding
12. Marking
13. Terminal Wiring Space
14. Accessibility
15. Dry-Type Transformers Installed Indoors
16. Dry-Type Transformers Installed Outdoors
17. Less-Flammable Liquide-Insulated Transformers
18. Nonflammable Fluid-Insulated Transformers
19. Askarel-Insulated Transformers Installed Indoors
20. Oil-Insulated Transformers Installed Indoors
21. Oil-Insulated Transformers Installed Outdoors
22. Modification of Transformers
23. Transformer Vaults
1. Location
2. Walls, Roofs, and Floors
3. Doorway
24. Ventilation Openings
25. Drainage
26. Water Pipes and Accessories
27. Storage in Vaults

Course Summary

This course is intended to cover the specification, design, and application/installation of large and small transformers for different projects. The course provides the necessary rules, minimum basic legal requirements, and guidance for the design, and the installation of transformers. Topics such as overcurrent protection, secondary ties, parallel operation, grounding, guarding, and transformer vaults are discussed.

Quiz

Once you finish studying the above course content, you need to take a quiz to obtain the PDH credits.

---

DISCLAIMER: The materials contained in the online course are not intended as a representation or warranty on the part of PDH Center or any other person/organization named herein. The materials are for general information only. They are not a substitute for competent professional advice. Application of this information to a specific project should be reviewed by a registered architect and/or professional engineer/surveyor. Anyone making use of the information set forth herein does so at their own risk and assumes any and all resulting liability arising therefrom.

---