Standard |
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 |
4 |
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Types of Transformers |
D. Lab |
0 |
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National Electrical Code Requirements |
P. Lab/O.B.I. |
2 |
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Safety Precautions |
Credit |
4 |
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Prerequisite: |
ELT 109 |
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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 |
P.Lab/ O.B.I. |
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TRANSFORMER THEORY |
10 |
0 |
5 |
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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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10 |
0 |
5 |
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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 |
10 |
0 |
5 |
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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 |
10 |
0 |
5 |
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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 |
Adams, J., &
Rockmaker, G. (1985). Industrial
electricity: Principles and practices (3rd ed.). New York: McGraw-Hill.
Alerich, W. N. (1992).
Electric control. Albany, NY: Delmar.
Fuchs, D. J., &
Gerstang, S. (Year). Electrical motor
controls. Indianapolis: Howard W. Sams.
Larson, B. (1983). Power control electronics. Englewood
Cliffs, NJ: Prentice Hall.
McIntyre, R. L. (1971).
Electric motor control fundamentals. New
York: McGraw-Hill.
Miller, R. (1982). Industrial electricity. Peoria, IL:
Bennett.
Mullin, R. C. (1981). Electrical wiring (industrial). Albany,
NY: Delmar.
Nadon, J., et al. (1984).
Industrial electricity. Albany, NY:
Delmar.
Patrick, D. R., &
Fardo, S. (1978). Experimenting with
industrial electrical systems. Indianapolis: Howard W. Sams.
Patrick, D. R., &
Fardo, S. (1985). Rotating electrical
machines and power systems. Englewood Cliffs, NJ: Prentice Hall.
Rosenberge, S. (1970).
Electric motor repair. New York:
Holt, Rinehart & Winston.
Smith, R. L. (1984).
Electrical wiring--industrial. Albany,
NY: Delmar.