Basic Electrical Theory - Overview of AC Motors, Transformers and Measuring Instruments

A. Bhatia, B.E.

Course Outline

This electrical training course provides a basic introduction to AC motors, transformers and electrical measurements and discusses the principles, methods as well as the underlying theories and concepts needed for a strong foundation in electrical technology. This course will be extremely helpful to individuals who are just beginning a career in electrical work, or who require a basic knowledge of electrical principals and equipment to better their primary responsibilities. This course is also a prerequisite for the all other electrical training.

This 3-hr course material is based entirely on US Department of Energy training materials DOE-HDBK-1011/4-92, Fundamentals Handbook, Electrical Science, and Volume 4 of 4. The volumes 1, 2 and 3 of the handbook have been separately listed.

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

Learning Objective

At the conclusion of this course, the student will:

• Describe how a rotating magnetic field and torque is produced in an AC motor;
• Explain the relationship between speed, torque, frequency and poles in an AC induction motor;
• Explain why an AC synchronous motor does not have starting torque and describe the effects of over and under-exciting an AC synchronous motor;
• State the applications of the following types of AC motors: a. Induction, b. Single-phase and c. Synchronous;
• Define the following terms as they pertain to transformers: a) Mutual induction; b) Turns ratio; c) Impedance ratio; and d) Efficiency;
• Describe the differences between a WYE-connected and delta-connected transformer;
• Be able to calculate voltage, current, and power for various combinations of delta-wye connections;
• Understand the electrical parameters measured by voltmeter, Ammeter, Ohm meter, Wattmeter, Ampere-hour meter, Power factor meter, Ground detector,. Synchroscope etc and explain how these are connected to a circuit;
• Learn the terms such as single (one-line) diagram, commercial or utility power, failure-free power, neutral grounding, voltage class, protective relays, overlapping protective zones and understand how these apply to Electrical Distribution Systems;
• Describe the protection provided by fuses, protective relays and circuit breakers;
• State the function of motor controllers and the protective features associated with controllers; and
• Understand the various power distribution schemes and describe the methods of connecting single-phase loads to a three-phase power source.

Intended Audience

This course is aimed at beginners, novice engineers, electricians, hobbyists, plant mechanics, service technicians, maintenance supervisors, plant engineers, contractors, energy auditors, layout professionals and general audience.

Course Introduction

Alternating Current (AC) is the world standard for driving motors and other electrical equipment. In this course, you are required to study the DOE-HDBK-1011/4-92, Fundamentals Handbook, Electrical Science, and Volume 4 of 4. The information in the handbook is presented to provide a foundation for applying engineering concepts to the job.

Course Content

This course is based entirely on US Department of Energy training materials DOE-HDBK-1011/1-92, Fundamentals Handbook, Electrical Science, Volume4 of 4.

The link to the document is Basic Electrical Theory - Overview of AC Motors, Transformers and Measuring Instruments.

Course Summary

Course Summary is in the following PDF file:

Course Summary - Remember These Facts

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.