Electrical engineering courses

PRACTICAL MOTOR PROTECTION, TESTING, CONTROL & MAINTENANCE

Ref No: 2015064

COURSE DESCRIPTION
It is estimated that electrical drives and other rotating equipment consume about 50% of the total electrical energy consumed in the world today (and this figure increases to 70% if you only consider industry.)  The cost of maintaining electrical motors can be a significant amount in the budget item of manufacturing and mining industries. This course gives you a thorough understanding of electrical motor’s protection, control and maintenance and gives you the tools to maintain and troubleshoot electrical motors.

You will gain a fundamental understanding of the protection, control and maintenance of electric motors and drives. Typical applications of electric motors in manufacturing, materials handling, process control are covered in detail. The concluding section of the course gives you the fundamental tools in troubleshooting motors confidently and effectively.

COURSE OBJECTIVES
Upon completion of the course participants will be able to:
Specify protection requirements for motors
Maintain electrical motors
Specify  speed control requirements for motors
Understand essentials of motors and drives
Detail the main issues with testing of motors
Prevent or at least minimise motor bearing failure
Troubleshoot and fix faults on motors and drives
Interface control circuits of motors with PLC’s/DCS’s 
Reduce downtime on electrical motors
Improve plant safety
Improve plant throughput
Reduce your spares usage and requirements

TRAINING METHODOLOGY
This interactive training course includes the following training methodologies as a percentage of total tuition hours:-
30% Lectures
30% Workshops and Work Presentation
20% Group Work & Practical Exercises
20% Videos & General Discussions

Welcome & Introduction
Fundamentals of Motor Technology and Construction  
Basic principles of rotating electric machines
Fundamental principles of speed control
Efficiency, torque, inertia, horsepower/power factor
Torque-speed curves

Fundamentals of Motor Technology and Construction (cont’d)
Induction/synchronous/wound rotor types
Basic construction and physical configuration, windings
Principles of operation and performance

Three Phase Ac Induction Motors 
Components
Theory of operation
Induction motor design
Duty cycles
Insulation and Cooling requirements

Three Phase Ac Induction Motors (cont’d)
Starting methods
Selecting motors
Types of faults, fault finding and testing of AC machines
Testing instrumentation
Energy Losses and Efficiency of Three Phase Ac Induction Motors 
Standards
Types of Losses
Tests for measurement and computation of losses and efficiency
Dynamometers

Energy Losses and Efficiency of Three Phase Ac Induction Motors (cont’d)
Principles of load application by braking
Torque measurement basics
Types of practical dynamometers

Motor Failure Analysis 
Frequent starts
High inertia
Inadequate cooling
Congestion on fan cover
Improper spacing at end of motor

Motor Failure Analysis (cont’d)
Incorrect belt alignment
Solid belt guards
Excessive loading causing bearing clearance problems
Insulation failures
Bearing current problems
Testing
Insulation life and resistance
Polarization index
DC Hipot
DC ramp test
AC hipot
Capacitance test

Testing (cont’d)
Dissipation factor
Partial Discharge
Surge test
Mechanical testing
Online testing

Bearing Failure Analysis
Bearing failures
Grease and greasing
Belt Drive aspects
Balance
Storage issues
Service factor loading

Protection Of Motors
Thermal overload
Time constraints
Early relays and new digital relays
Starting and stalling conditions
Over Current / Overload
Under-voltage / Over-voltage
Protection Of Motors (cont’d)
Under frequency
Pole slip / Out of step 
Loss of excitation 
Inadvertent energization 
Over fluxing 
Stall protection / acceleration time / Start up supervision /Time between starts 

Protection Of Motors (cont’d)
Unbalanced supply voltages
Negative sequence currents
De-rating factors
Earth faults – core balance, residual stabilising resistors
Calculation of protective relay settings

Motor Control 
Power Circuit
Control Circuit
Full Online voltage starting
Reduced voltage starting
Delta-star
Resistance
Reactor

Motor Control (cont’d)
Reduced voltage starting (cont’d)
Autotransformer
Soft start

Speed Control
Reversing
Control System For Ac Variable Speed Drives
Overall control system
Power supply for the control system
Dc Bus charging system
VSD control loops (Open Loop/Closed loop)

Control System For Ac Variable Speed Drives (cont’d)
Vector control
Current feedback in ac variable speed drives
Speed feedback from motor

Installation And Fault Finding
General installation and environmental requirements
Power supply connections and earthing
Where to install contactors in power circuit
Installation of ac converters into metal enclosures

New Technologies and Developments 
Summary, Open Forum and Closing
Presentation of Certificates

Anyone associated with the use of electrical motors in the industrial or automation environment.  The course will also benefit those working in system design as well as site commissioning, maintenance and troubleshooting.
Plant Engineers
Instrument Technicians
Engineering and design personnel
Operations personnel
Electrical Maintenance Technicians 
Instrument and Control Engineers
Electrical Contractors
Electrical consulting engineers
Process control Engineers
Mechanical Engineers
Service Technicians
Maintenance Personnel
Electrical Maintenance Supervisors

Trainees shall receive a portfolio containing a comprehensive course manual.

Attendees shall receive a certificate of attendance from AMAD Tech.