Introduction to Induction Motors and Power Transformers Applications and Principles of Operations

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Course Overview

Learn practical information about the two most important types of electrical equipment. In this course, you’ll learn how to apply, specify, operate, maintain, or engineer the installation of power transformers or electric motors and associated equipment in an industrial, commercial, institutional, or electric utility setting.

Who Should Attend?

Who should attend?

Utility, plant, or consulting engineers and technicians involved in the selection, specification, application, operation, maintenance, installation, or engineering of the installation of motors or transformers.

Additional Information


Enrollment is limited in this course. If you wish to attend, you may add your name to the wait list. There is no fee for doing so. When space becomes available, you will be notified and given the option to enroll.  

If you plan to purchase airline tickets to attend this course, do not do so until after we notify you that a place is available in the course, and you have decided to enroll. We are not able to refund you for this expense if you book your tickets prior to enrolling in the course.

Please email questions to Christine Congdon.

Course Outline

Day 1

Magnetic Fields and Magnetic Circuits

  • Inductance and mutual inductance
  • Magnetic materials
  • Workshop 1:  magnetic circuits

Magnetic Circuits and Transformers

  • Ideal transformers
  • Real transformers
    • equivalent circuit
    • single phase
    • three phase
    • leakage flux
    • leakage reactance
    • impedance and losses
  • Workshop 2:  transformers

Transformer Nameplate Information

  • kVA
  • Voltage ratio
  • Impedance
  • BIL
  • Polarity
  • Phasor diagram
  • Connections

Single-Phase Transformer Connections

Common Three-Phase Transformer Connections

  • Delta-delta
  • Wye-wye
  • Delta-wye
  • Workshop 3:  transformer connections

Transformer Applications

  • Impedance and voltage regulation
  • Winding polarity: additive vs. subtractive
  • Fixed taps and load tap-changers
  • Cooling methods and classifications: ONAN vs. OA
  • Loading above nameplate
    • loading guides
    • loss of life curves
  • Loading below nameplate
  • Paralleling transformers
    • load sharing
    • circulating current
  • Through-fault withstand
    • damage curves
    • thermal vs. mechanical damage
  • Overexcitation
  • Harmonics and K-factor
  • Unbalanced phase loading: effect on kVA rating
  • Workshop 4:  paralleling transformers

Day 2

Induction Motor Basics

  • Three-phase induction machines: equivalent circuit and induction motor performance calculations
  • Single-phase induction motors

Motor Starting and Control

  • Motor control centers: motor starters and motor protection
  • Starting methods
  • Across-the-line
  • Reduced voltage: resistor starters, reactor starters and autotransformer starters
  • Wye-delta starters
  • Part-winding starters
  • Two-speed motors
  • Wound-rotor motors
  • Variable frequency drives
  • Soft starters
  • Workshop 5:  motor starting

Motor Application

  • How to select a motor
  • Understanding and applying motor nameplate information: NEMA design letters, NEMA frame sizes, service factor, and starter limitations
  • Workshop 6:  motor starting time

Motor Circuit Design Basics

  • Conductor selection
  • Circuit protection
  • Workshop 7:  motor circuit design


"I have taken over seven sessions like this, and this one was the best by a wide margin! Dr. Fehr is a great instructor. It is not common to have someone who has real-world experience, a strong academic background, and excellent presentation skills."
Jeff Bragg, Lead Engineer–Electrical Distribution Engineering, Central Maine Power Company, Augusta, ME

"Great instructor. In fact, the best I have worked with."
Aseem Bhatia, Engineer, Nevada Power, Las Vegas, NV

"The instructor's delivery of the course was one of the best I have seen."
Alan Day, Senior Engineer, Entergy, Saint Gabriel, LA


Ralph E. Fehr

Ralph E. Fehr, PhD, PE, is an independent engineering consultant and instructor in power system engineering at the University of South Florida. He has more than 20 years of experience in the electric power industry and is a registered engineer in Florida and New Mexico. Fehr has held various positions in transmission and distribution engineering design, operations, planning, and maintenance at Tampa Electric Company, Florida Power Corporation, Public Service Company of New Mexico, the U.S. Air Force, and Gilbert/Commonwealth Engineers and Consultants. He is an experienced instructor of university engineering courses and continuing education short courses. Fehr has written technical articles for EC&M magazine and is author of the textbook, Industrial Power Distribution. Fehr received a bachelor’s degree in electrical engineering from the Pennsylvania State University, a master’s degree in electrical power engineering from the University of Colorado at Boulder, and a Ph. D in electrical engineering from the University of South Florida.

John Raksany

John A. Raksany, PE joined the Department of Engineering Professional Development at the University of Wisconsin–Madison as a program director in 1998. Previously a senior maintenance planning engineer for Alliant Utilities, he has 27 years of experience in power delivery system planning, protection and control, maintenance, and substation design.

Upcoming dates (0)

Take this course when it’s offered next!

Program Director

John Raksany

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