Event Date/Time: Nov 25, 2010
|
End Date/Time: Nov 26, 2010 |
Description
Motors are the workhorse of industrial, building and commercial electrical power systems. This course combines theoretical and practical considerations and aspects of operational principles of motors, their types, selection, testing, maintenance and troubleshooting. The course emphasizes motor’s operational performance characteristics and electrical properties. The discussion is based on the latest IEEE and NEMA Standards governing motors and applications.
Venue
Additional Information
Objective
To provide a comprehensive understanding of principles of operation, types, selection, testing and commissioning, protection, maintenance and troubleshooting of AC electric motors.
Target Audience
Electrical professionals who need to refresh and expand their knowledge, maintenance managers, and power system consultants. A basic understanding of electrical system operations is needed, but participant do not necessarily have to be experts in the areas covered. In addition, professionals who are starting their career in the field of power in electrical utilities, industrial or commercial and institutional facilities will profit from this course.
Program Outline (1.2 CEUs / 12 PDHs)
DAY 1
Basic Principles
Electric currents and magnetic fields
Hysteresis, and eddy current losses
Efficiency and Losses
Induction Motors: The Basics
Rotating Magnetic Fields
Motor operational characteristics
Motor construction Features
Motor Operational Characteristics
Motor power and torque speed characteristics
Variations in motor torque speed characteristics: effects of voltage, frequency and unbalanced sources
Motor design classes
Motor insulation classes
Types of Electric Motors
Rotating magnetic fields in single-phase induction motors
Operational principles of single phase motors
Equivalent circuits for single phase induction motors
Starting single-phase induction motors
Shaded-Pole Motors
Split-Phase Motors
Permanent Split-Capacitor Motors
Capacitor Start Motors
Capacitor-Start-Capacitor-Run Motors
Repulsion Motors
Design letters of single phase small motors
DAY 2
Mechanical Considerations
Vibrations
Sound
Heating and Cooling
Motor Protection
Items to Consider in Protection of Motors
Types of Protection:
Undervoltage
Phase unbalance, instantaneous phase overcurrent
Time-Delay Phase Overcurrent, Overload (Phase Overcurrent)
Instantaneous Ground Overcurrent, Time-Delay Ground Overcurrent
Phase Current Differential, Split Winding Current Unbalance
Stator Winding Overtemperature, Rotor Overtemperature
Induction Motor Incomplete Starting Sequence Protection
Protection Against Too Frequent Starting
Rotor Winding Protection
Lightning and Surge Protection
Protection Against Overexcitation from Shunt Capacitance
Protection Against Automatic Reclosing or Automatic Transfer
Protection Against Excessive Shaft Torques Developed During Transfer of Motors Between Out-of-Phase Sources
Protection Against Failure to Rotate or Reverse Rotation
Mechanical and Other Protection
Motor Maintenance, Testing and Troubleshooting
Failure modes
Bearing and lubrication
Preventive maintenance
Testing
On-line Diagnostic Testing
Motor Selection and Application
Electrical Factors to consider
Mechanical Factors to consider
Application considerations
Economics of motor owning
Instructor