Operation & Maintenance Generator Transformer Circuitbreakers

Course Outline

• Understand the need of standby power sources
• Types of generating sets, selection criteria for given application, Economy factor
• Introduction to DG sets
• Composition of Modern DG sets
  • Combustion system
  • Fuel system
  • Lubrication system
  • Cooling system
  • Induction & exhaust systems
  • Control panel
• Understand the principles of combustion processes and engine operation
• Understand fuel and lube oil requirements
• Explain the various engine components and their functions
• Understand the generator principles and construction
• Review plant layout requirements for single and multiple units
• Learn about associated control panels and operation
• Comprehend the testing and commissioning procedures
• Understand plant performance troubleshooting techniques
• Learn and apply good maintenance practices

Electrical Transformer Testing and Maintenance

Transformer Principles

• Transformers
• Right Hand Rule
• Magnetic Flux
• Magnetic Induction
• Left Hand Rule Turns Ratio
• Transformer Losses
• Transformer Types

Vector Diagrams

• Operating Principles
• Operation Without Load
• Operation with Load

Transformer Classifications

• Service Classification
• Instrument Transformers
  • Current
  • Potential

Transformer Construction (Construction)

• Magnetizing Circuits
• Losses
  • Hysteresis Loss
  • Eddy-Current Loss
• Efficiency

Cooling

• Air Cooled Oil-Immersed
  • Water-Cooled
  • Forced-Oil Cooling
  • Self-Cooling with Air Blast
• Temperature Limits
• Transformer Loading

Tap Changers

• No-Load Tap Changer
• Tap Changing Under Load
• Phase-Angle Control

Transformer Connections

• Single Phase Circuits
• Two-Phase Circuits
• Three-Phase Circuits

Transformer Maintenance

• Insulation Testing
• High Potential Testing
• Turns Ratio Testing
• Polarity Testing
• Power Factor
• Excitation Current
• DC Winding Resistance
• Polarization Recovery
• Insulating Fluid Dielectric
• Dissolved Gas Analysis

Transformers and Relaying

• Transformer Faults
• Differential Relaying
  • Normal Load
  • External Faults
  • Internal Faults

Circuit Breaker Fundamentals

• Circuit Breaker Functions
• The Interrupting Rating
• Principles of Arc Interruption
• Insulation Media: Breakers Categorized by Insulation Media
  • Air Circuit Breaker
  • Vacuum Circuit Breaker
  • Sulphur Hexafluoride(SF6) Breaker
• Insulation Requirements
• Circuit Breaker Controls
• Methods of Operation

Circuit Breaker Testing

• Contact Resistance
• Insulation Resistance
• Operation and Timing Tests

Air Circuit Breakers

• Description of Operation
• Periodic Inspection and Maintenance
• Elementary Wiring Diagram

Westinghouse Type DHP Air Circuit Breakers

• Periodic Inspection and Maintenance

Vacuum Circuit Breakers

• Principles of Operation
• Major Components
• Maintenance Notes