HT Motors and Protection Methods for Future Course

Course Overview:

This course is aimed at providing a detailed knowledge of how to operate, construct and maintain an AC motor. The participants will get familiarized with several motor types, motor duties, factors for de-rating and interpreting nameplate data.

The course  encompasses an introduction to an electrical motor technology which includes torque speed curves and the basic efficiency, insulation and cooling requirements of motors.

Other topics include condition monitoring and diagnostics and troubleshooting of induction motors with a focus on fault analysis, maintenance aspects and electrical safety. 

Targeted towards project engineers, maintenance staff and operations personnel, this course helps the learners to improve motor performance, reliability and efficient use of essential protection and maintenance of the motors.

Course Objectives:

This course is designed to enable participants to:

• Understand AC motor operation and construction.
• Overview different types of motor duties.
• Read & explain the motor NP data.
• Motor de-rating factors.

Who Should Attend?

The workshop will also benefit those working in system design as well as site commissioning, maintenance and troubleshooting. Typical personnel who would benefit are:

• Project Engineers.
• Design & Protection Engineers.
• Operations Personnel.
• Electrical Maintenance Engineer And Senior Electrical Maintenance Engineer.
• Maintenance Personnel

Course Outlines:

• Review of Fundamentals/Basics
• Resistors, Ohm’s Law, Capacitors, dielectrics, magnetic field, Ampere's law, Faraday's law, inductance, and alternating currents. 
• Introduction to Different Types of Electric Motors
• DC motors.
• AC motors (1-Ph & 3-Ph).
• Induction Motors.
• Synchronous motors.
• International Codes and Standards
• Fundamentals of Motor Technology
• Basic construction and physical configuration, windings
• Principles of operation and performance
• How the motor produces torque.
• Theory of operation
• Basic principles of rotating electric machines
• Fundamental principles of speed control.
• Efficiency, torque, inertia, horsepower/power factor
•  Torque-speed curves.
• Motor Losses & Efficiency     
• Induction motor design
• Duty cycles
• Insulation and Cooling requirements
• Selecting motors
• Classified Ex motors.
• De-rating Factors (Temperature, altitude
• Voltage unbalance
• Power Factor Improvement
• Condition Monitoring and Diagnostics
• Partial Discharge
• Insulation Resistance Monitoring
• Correction for Winding Temperature
• Insulation Contamination
• IR Test Connections
• Typical IR Testing Program
• DC HI-POT TEST
• Maximum Allowable Test Voltage
• Measuring Insulation Degradation
• Capacitive Charging Current
• Resistive Leakage Current
• Insulation Power Factor
• Insulation Power Factor Standards
• Power Factor Test Sets
• Outage for Scheduled Maintenance
• On Line Measuring Partial Discharge Activity (PDA) For Insulation
• Motor Current Signature Analysis (MCSA)
• Maintenance of HT Induction Motors
• Maintenance Requirements
• Cleaning Motors
• Care of Stator Windings
• Care of Rotor Winding
• Motor Shaft Currents
• Inspecting Motor Bearings
• Different Electrical Testing
• Electrical Preventive Maintenance Work Instructions
• Troubleshooting Electric Motors
• Motor Failures
• Insulation failure
• Over-current/overloading
• Cable box failure
• Rotor burnout
• Bearings
• Vibration
• Induction Motors Troubleshooting Guide
• Motors and Electrical safety
• HT Motor Protection
• Introduction
• Motor characteristics involved in protection
• General motor protection
• Phase Fault Protection
• Differential Protection
• Ground-Fault Protection
• Thermal And Locked-Rotor Protection
• Locked-Rotor Protection For Large Motors (21)
• System Unbalance And Motors
• Unbalance And Phase Rotation Protection
• Under-voltage Protection
• Repetitive Starts And Jogging Protection
• Multifunction Microprocessor Motor Protection Units
• Practical Considerations of Motor Protection
• Effect On System Of Starting A Large Motor
• repeated starting
• Motor Starting Currents
• Achieving Short-Circuit Protection
• Motor Damage
• Motor Operation at Reduced Voltage
• De-rating due to unbalanced currents
• Determination of sequence currents
• Unbalanced supply voltages and single phasing.