In this program, students will learn about protective switches including fuses, circuit breakers, and motor overload heaters, as well as their respective overload contacts. Methods of troubleshooting these components are also covered. Fuse curves are presented to solidify the understanding of fuse operation and protection and how to select the proper fuse. Also covered is the effect of ambient temperature on thermal overloads and how they can affect motor control protection.


A. Motor Control Fundamentals

1. AC Motors

  • Induction
  • Synchronous
  • Wound Rotor

2. Power System Effects on Motors

  • Voltage
  • Frequency
  • Harmonics

3. Application of Motor Loads

  • Variable Torque
  • Constant Torque
  • Constant Horsepower

4. High Efficiency Motors

  • Cost vs. Energy Saving Analysis
  • Inrush Characteristics
  • KVA Code

5. Power Factor Correction

  • What is power factor?
  • Methods to improve it

B. Motor Control Techniques

1. Symbology and Terminology

  • Basic Symbols
  • The Power Circuit
  • The Control Circuit

2. Starting Methods

  • Full Voltage
  • Reduced Voltage
  • Wye-Delta
  • Soft Starting
  • Vacuum Contactors

3. Stopping Methods

  • Dynamic Braking
  • Plugging
  • Mechanical Braking

4. Speed Control

  • Separate Winding
  • Consequent Pole
  • Wound Rotor
  • Mechanical
  • Variable Voltage
  • Variable Frequency

C. Protection of Motors

  1. Thermal overload
  2. Time constraints
  3. Early relays and new digital relays
  4. Starting and stalling conditions
  5. Over Current/Overload
  6. Under-voltage/Over-voltage
  7. Under frequency
  8. Pole slip/Out of step
  9. Loss of excitation
  10. Inadvertent energization
  11. Over fluxing
  12. Stall protection/acceleration time/Start up supervision/Time between starts
  13. Unbalanced supply voltages
  14. Negative sequence currents
  15. De-rating factors
  16. Earth faults – core balance, residual stabilizing resistors
  17. Calculation of protective relay settings

D. Motor Failure Analysis

1. Electrical Failures

  • Insulation Failure
  • Thermal Heating
  • Harmonic Heating
  • Improper Grounding

2. Mechanical Failures

  • Bearing Failures
  • Belt Alignment
  • Shaft Alignment

3. Load Related Failures

  • Application Abuse
  • Overloading


Electrical engineers and Technical Staff who have to deal with the aspect of electrical motor protection, control and operation.

  • Group Discussions
  • Group & Individual Exercises
  • Presentations
  • Games
  • Case Studies
  • Role Plays
  • Self-Assessment
  • Action Plan
  • Certificate,
  • Quality Training Kit (Pencil case: Erase, Bolpoint, Pencil, Tipe X, Stabillo, Flash Disk 8 GB),
  • Bag.
  • Training Material (HandOut & SoftCopy)
  • Convenient training facilities in stars hotel (Public Training)
  • Lunch and Coffee Breaks (Public Training)
  • Souvenir
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