Standard
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ELT 116 – Transformers
Provides
instruction in the theory and operation of specific types of transformers.
Emphasis will be placed on National Electrical Code requirements related to the
use of transformers. Topics include: transformer theory, types of transformers,
National Electrical Code requirements, and safety precautions.
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Competency Areas: |
Hours: |
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Transformer Theory |
Class |
3 |
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Types of Transformers |
D. Lab |
0 |
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National Electrical Code Requirements |
P. Lab/O.B.I. |
3 |
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Safety Precautions |
Credit |
4 |
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Prerequisite: |
ELT 119, IFC 101 |
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Corequisite: |
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Course Guide
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Competency |
After completing this section, the student will: |
Hours |
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Class |
D. Lab
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P. Lab/
O.B.I. |
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TRANSFORMER THEORY |
9 |
0
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8 |
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Components |
Identify basic transformer components. |
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Single-phase |
Calculate primary and secondary voltages. |
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Recognize a single-phase three-wire system. |
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Three-phase |
Connect Wye or Delta connections on primary or secondary
currents. |
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Impedance |
Calculate impedance in transformers. Calculate transformer efficiency. |
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TYPES OF TRANSFORMERS
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7 |
0
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8 |
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Identification |
Identify three-phase transformer connects. |
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Recognize specialty transformers. |
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Identify application for auto-transformers, dual-voltage
transformers, and buck-boost transformers. |
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NATIONAL ELECTRICAL CODE REQUIREMENTS
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7 |
0
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8 |
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NEC requirements |
Interpret grounding requirements for transformers. |
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Calculate interrupting ratings for overcurrent
devices on primaries and secondaries. |
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Guard transformers according to the provisions of the NEC. |
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SAFETY PRECAUTIONS |
7 |
0
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6 |
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Hazards |
Identify hazards that the guarding procedures of the NEC
require. |
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Procedures |
Develop safe installation and replacement procedures. |
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Suggested Resources
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Herman,
Stephen; Delmar’s Standard Textbook of
Electricity (2nd ed.),
Delmar
Publishers ISBN 0-8273-8550-1
Herman,
Stephen; Experiments in Electricity for
use with Lab-Volt
Herman,
Stephen and Singleton, Donald; Delmar’s
Standard Guide – Transformers, Published
by Delmar Publishers, ISBN 0-8273-7209-4
Rockis/Mazur;
Electric Motor Controls (2nd
ed.),
American Technical Publishers ISBN
0-8269-1675-9
Rockis/Mazur;
Electric Motor Controls Workbook (2nd
ed.),
American Technical Publishers ISBN
0-8269-1676-7
Stallcup;
Stallcups Electrical Design Book for 2002, Publisher NFPA, ISBN G4-SED-02
NEC 2002 Code, NFPA, Delmar Publishers ISBN 0-8776-5460-3