E301 - Fundamentals of Motor, Transformer & Breaker Maintenance

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5 days - 3.2 Continuing Education Units Awarded



Course Dates Download Brochure PDF
USD 2,495.00


Plant electricians, new engineers, mechanics (who work with and around electrical equipment) can gain significantly from this Seminar. This Seminar provides fundamental knowledge of how the electrical device functions. This fundamental knowledge is a critical piece of and O&M skills. The Seminar provides practical knowledge associated with how a machine is constructed, defining components the component purpose, and how it may be at risk. This Seminar also provides information on the skills necessary to implement a quality preventive maintenance program, to troubleshoot operational problems and corrective maintenance activities for the more common integrity issues.

This Seminar discusses construction, operation, and routine preventive / corrective maintenance of: AC Motors, DC Motors, Distribution Transformers, Low Voltage Circuit Breakers, and Protective Systems.

OBJECTIVES
Day One & Two - AC & DC Motors

  1. Define related motor terms.
  2. Describe the various types of motor enclosures.
  3. Describe how the rated motor voltage differs from system voltage.
  4. Demonstrate the ability to interpret nameplate data.
  5. Describe the basic construction and components of those AC motors typically found in an industrial setting.
  6. Explain the relationship between speed, frequency, and the number poles in a 3-phase induction motor.
  7. Define percent slip and speed regulation.
  8. Explain how a 3-phase motor direction is reversed.
  9. Describe the main components and types of DC motors
  10. Define torque, starting current, and armature reaction as they apply to a DC motor.
  11. Describe dual-voltage motors and their application.
  12. Describe the methods for determining various motor connections.
  13. List and briefly explain six causes for rotating machinery failure.
  14. Describe the various types of rotary machinery maintenance: visual inspections, tightness checks, air gap distance, and bearing lubrication and replacement.
  15. Describe the following rotating machinery tests: insulation resistance, continuity, vibration analysis, DC high potential, power factor, and thermography.

Day Three - Distribution Transformers
  1. Describe the operation of a transformer.
  2. Describe the magnetic conductivity.
  3. Describe how voltage is stepped up and stepped down.
  4. Explain the relationship between electric current and magnetic field.
  5. Describe conductivity and retentivity.
  6. Describe turns ratios.
  7. Describe transformer losses.
  8. Explain transformers using vectors
  9. Classify transformers.
  10. Describe instrument transformers.
  11. Describe various wiring connections such as wye/wye, wye/delta, and delta/delta.
  12. Describe transformer maintenance and safety.

Day Four - Low Voltage Circuit Breakers
  1. Define the following terms: overcurrent, overload, circuit breaker, and inverse time.
  2. Describe how inverse time-current characteristic can be applied to a circuit breaker.
  3. Describe how a series trip and solid state trip units function and are tested.
  4. List the protective devices found in a molded case breaker.
  5. Explain how molded case trip devices are tested.
  6. Describe the two basic types of low circuit breaker contacts.
  7. Describe the five basic types of low circuit breaker operating mechanisms.

Day Five - Machinery Protection
  1. Explain why protective devices are used in electrical equipment.
  2. Describe how a fuse works and is typically applied.
  3. Describe how a circuit breaker works and is typically applied.
  4. Describe what protective relays are and is typically applied.
  5. Describe how an overcurrent relay works and is typically applied.
  6. Describe how an undervoltage relay works and is typically applied.

Seminar OUTLINE
Day One & Two - AC & DC Motors

  1. Terms and Definitions
  2. Motor Enclosures: Open Motor, Enclosed Motor
  3. Nameplate Data: Rated Voltage, Full-Load Amps (FLA), Rate Full-Load Speed, Rated Horsepower, Frame Sizes, Duty or Time Rating NEMA Design Letter, Insulation Class, Nominal Rated Voltage, Minimum Starting Voltage, Frequency, Service Factor, KVA Code Letter, Bearings, Locked-Rotor Current, Starting Current, Temperature Rise, Power Factor.
  4. Introduction: Single-Phase AC Motors, Single-Phase Induction Motors, Split-Phase Induction Motors, Three Phase Motors, Motor Theory, Rotating Fields, Rotor Behavior in a Rotating Field, Induction.
  5. Induction Motors: Construction, Stator, Rotor, Torque, Starting Current, Power Factor, Speed Control Reversing Rotation
  6. Synchronous Motors: Construction, Principle of Operation, Rotor Field Excitation, Synchronous Motor Pullout, Synchronous Motor Torque Angle
  7. Wound Rotor Motors and Control
  8. Direct Current Motors: Armature Construction, Types of DC Motors, Torque, Starting Current and Counter EMF, Starting Resistance, Armature Reaction, Interpoles, Direction of Rotation of DC Motors
  9. Shunt Motors
  10. DC Series Motors: Speed Control and Speed Regulation, Motor Ratings
  11. DC Compound Motors: Torque, Speed, Industrial Applications

Day Three - Distribution Transformers
  1. Transformer Principles: Power Distribution, Increase of Voltage, Reduction of Voltage, Transformers, Electric Current and Magnetic Field Relationships, Magnetic Flux, Conductivity (Permeability), Retentivity, Induction, Electromotive Force of Induction, Counter Electromotive Force, Calculations, Leakage, Open-Closed Core Transformers, Turns Ratios, Losses, Eddy-Current Loss, Hysteresis Loss, Transformer Types
  2. Vector Diagrams: Transformer Operating Principles, Operation with/without Load, Calculating Secondary Voltage, Ideal Transformer, Non-Inductive vs. Inductive Load, Vector Diagrams, Ratio
  3. Transformer Classification: Service Classification, Instrument Transformers, Current Transformers (CT), Calculating Operating Ratio, CT Classes, Polarity Markings, CT Precautions, CT Accuracy, Potential (Voltage) Transformers (PT), PT Types, PT Accuracy, Constant-Current Transformers, Constant-Current Regulator Operation, Series Transformers, Small Power Transformers, Control and Signal, Special Purpose, GSU, Substation, Distribution Transformers, Purpose Classification
  4. Transformer Circuit: Magnetic Circuits, Magnetic Flux, Construction, Aging and Annealing, Exciting Current, Iron Loss, Hysteresis Loss, Eddy-Current Loss, Forces on Windings, Copper Loss, Reactive Voltage, Impedance, Calculating Impedance, Regulation, Efficiency
  5. Transformer Connections: Voltage Transformations, Single-Phase, Taps, Single-Phase, Polarity Testing, Transformer Connections, Two-Phase Circuits, Three-Phase Circuits, Wye and Delta Connections, Open Delta, T to T, Voltage-Vector Diagram Construction, Voltage-Vector Diagram Test Procedure, Transformer Connections, Parallel Operation, Displacement, Ratio, Calculating Circulating Current, Percent Impedance, Calculating Load
  6. Transformer Maintenance: Transformer Safety Standards, Transformer Circuit Grounding, Clearances, Secondary Circuits, Entering Dangerous Areas, Inspection and Maintenance, Load and Voltage, Ground Connections, Insulation Tests, Insulation Resistance, Detailed External Inspection

Day Four - Low Voltage Circuit Breakers
  1. Definitions
  2. Basic Protective Device Requirements
  3. Time Current Characteristics
  4. Low Voltage Power Circuit Breaker Trip Devices: Series Trip Unit, Solid State, Trip Devices
  5. Protective Device Maintenance and Testing
  6. Low Voltage Power Circuit Breaker Testing
  7. Molded Case Circuit Breakers: Molded Case Overload Devices, Thermal Trip Element, Magnetic Trip Element, Thermal-Magnetic Trip Element
  8. Testing the Molded Case Circuit Breaker
  9. Circuit Breaker Contacts
  10. Operating Mechanisms: Solenoid Operated Mechanisms, Motor Charged Spring, Manual Charged Spring, Manual Operating Mechanisms
  11. Molded Case Circuit Breakers: Molded Case, Operating Mechanism, Arc Extinguishers and Contacts, Contacts, Trip Elements, Modifications and Accessories
  12. Introduction to Air Circuit Breakers
  13. Low Voltage Power Circuit Breakers
  14. Introduction to Vacuum Circuit Breaker
  15. Principles of Vacuum Circuit Breakers
  16. The Vacuum Interrupter
  17. Introduction to Gas Circuit Breakers
  18. Sulphur Hexaflouride Gas Interruption

Day Five - Machinery Protection
  1. Protection Schemes: Protective Devices, Zones Of Protection, Fault Protection
  2. Protective Devices: Protective Relays, Overcurrent Relays, Undervoltage Relays, Instrument Transformers, Potential Transformers, Current Transformers
  3. Generator Protection: Short Circuit Protection, Ground Fault Protection, Low Field Excitation Or Loss Of Field Excitation Protection, Generator Motoring Protection
  4. Transformer And Bus Protection: Transformer Protection, Unit Differential Protection, Bus Protection
  5. Motor Protection: Short Circuit And Overload Protection, Undervoltage Protection, Disconnect Devices, Motor Protection Arrangement, Motor Protection Arrangement, Ground Detection
  6. Auxiliary Power System, System Components, System Protection, Backup Protection, Operator Actions