Electrical Equipment Maintenance, Testing And Troubleshooting

This course is designed to provide a comprehensive understanding of the various types of motors, variable-speed drives, transformers, generators, rectifiers and inverters, uninterruptable power systems (UPS), circuit breakers, and fuses. Upon the successful completion of this course, participants will be able to specify select, commission, and maintain this equipment for their applications. Further, participants will have enough knowledge to achieve reduced capital, operating, and maintenance costs along with an increase inefficiency.

Audience

This course is intended for:

Electrical Engineers
Technical staff, who are involved in the selection, installation, operation, testing, troubleshooting or maintenance of electrical equipment.
Maintenance personnel
Electrical supervisors

Course objectives

The participants will be able to:

Specify, select, install, operate, test, troubleshoot, and maintain various types of electrical equipment such as transformers, motors, variable speed drives, generators, circuit breakers, switchgear, and protective systems
Carry out diagnostic testing and inspection, advanced fault detection techniques, critical components, and common failure modes for electrical equipment
Apply selection criteria, commissioning requirements, predictive and preventive maintenance, reliability, testing, and cost estimation for electrical equipment
Implement the maintenance techniques required to minimize the operating cost and maximize the efficiency, reliability, and longevity of electrical equipment

Course contents

Day-1

Capacitors
Current and Resistance
The Magnetic Field
Three-Phase System
Electric Machines and Transformers
Common Terms and Principles
The Magnetic Field

Magnetic Behavior of Ferromagnetic Materials
Importance of Transformers
Types and Construction of Transformers
The Ideal Transformer
Impedance Transformation Through a Transformer
Analysis of Circuits Containing Ideal Transformers
Theory of Operation of Real Single-Phase Transformers
The Voltage Ratio Across a Transformer
The Magnetizing Current in a Real Transformer
The Equivalent Circuit of a Transformer
The Transformer Voltage Regulation and Efficiency
The Autotransformer
Three-Phase Transformers
Cause of Transformer Failures
Transformer Oil
Gas Relay and Collection Systems
Relief Devices
Interconnection with the Grid

Day-2

The Rotating Magnetic Field
The Induced Voltage in AC Machines
the Induced Torque in a Three-Phase Machine
Winding Insulation in AC Machines
AC Machine Power Flow and Losses
Induction Motor Construction
Basic Induction Motor Concepts
The Equivalent Circuit of an Induction Motor
Losses and The Power-Flow Diagram
Induction Motor Torque-Speed Characteristics
Control of Motor Characteristics by Squirrel-Cage Rotor Design
Starting Induction Motors
Speed Control by Changing the Line Frequency
Speed Control by Changing the Line Voltage
Speed Control by Changing the Rotor Resistance
Solid-State Induction Motor Drives
Motor Protection
The Induction Generator

Day-3

Characteristics of Motors
Enclosures and Cooling Methods
Application Data
Design Characteristics
Insulation of AC Motors
Failures in Three-Phase Stator Windings
Predictive Maintenance
Motor Troubleshooting Diagnostic Testing for Motors
Repair and Re
Furbishment of AC Induction Motors
Failures in Three-Phase Stator Windings
Introduction to Power Electronics
Power Electronics Components
Power and Speed Comparison of Power Electronic Components
Basic Rectifier Circuits
Filtering Rectifier Output
Pulse Circuits
A Relaxation Oscillator Using a PNPN Diode
Pulse Synchronization
Voltage Variation by AC Phase Control
The Effect of Inductive Loads on Phase Angle Control
Inverters
Motor Application Guidelines

Day-4

On-Load Maintenance and Monitoring
Off-Load Maintenance
Generator Testing
Typical Generator Operational Problems
Generator Rotor Reliability and Life Expectancy
Generator Rotor Refurbishment
Types of Insulation
Generator Rotor Modifications
Upgrades and Updates
High-Speed Balancing
Flux Probe Test
Theory of Circuit Interruption
Physics of Arc Phenomena
Circuit Breaker Rating
Conventional Circuit Breakers
Methods for Increasing Arc Resistance
Plain Break Type
Magnetic Blow-out Type
Arc Splitter Type
Application
Oil Circuit Breakers
Recent Developments in Circuit Breakers
FUSES
Types of Fuses
Features of Current Limiting Fuses
Advantages of Fuses Over Circuit Breakers

Day-5

Proper Lube Oil Sampling Technique
Test Description and Significance
Visual and Sensory Inspection
Chemical and Physical tests
The Application of Sine Waves to Vibration
Multi-mass Systems
Resonance
Logarithms and Decibels (DB)
The Use of Filtering
Vibration Instrumentation
Time Domain
Frequency Domain
Machinery Example
Vibration Analysis
Resonant Frequency
Vibration Severity

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