Online Training - Circuit Breakers Operation and Maintenance

OBJECTIVE

1. The importance of preventive maintenance check and servicing of the various types of circuit breakers
2. Implementation of safe systems of work and operations
3. Co-ordination of maintenance activities and maintaining system safety
4. To be able to understand the component functionalities of the gas and vacuum circuit breakers
5. Methods of arc extinction for MV HV circuit breakers
6. Routine inspections and the functions of the micro processor component in the circuit breakers

MATERI 1. Introduction-Reasons for Faults-and Classification of Faults

• Distinction Between Load and Fault Current
• Sources of Short-Circuit Current
• Introduction to Fault Calculations
• Balanced and Unbalanced Faults
• Overview of Power System Protection
  • Measurement-Voltage and Current Transformers
  • Protective Device Characteristics
  • Types of Protection Systems
  • The Role and Importance of The Circuit Breaker In Power Systems

2. General Principles of Arc Extinction

• Overview of Types of Circuit Breaker
  • Air-Break
  • Vacuum
  • Gas
  • Other Related Switching Devices
  • The Single-Line Diagram
  • Substation Layouts
• Air-Break
  • Principles of Arc Extinction
  • Circuit Breaking
  • Circuit Breaking
  • Contacts and Arc Initiation
  • Arc Chutes
  • Performance Characteristics
  • General Construction Principles
  • Vacuum
• History-The Early Years
• The Vacuum Arc-An Overview
• Current Interruption in Vacuum
• Methods of Keeping the Arc Diffuse
• Current Chopping-General Implications
• Vacuum Interrupters in Series
• Design of Vacuum Switchgear
• Maintenance and Testing Requirement

3. SF6 Gas

• Properties of SF6
• Principles of Arc Extinction
• Features of Construction
• Mechanism Principles
• Insulation Principles
• Gas Leak Problems
• Specific Supervision Requirements
• Circuit Power Factor Considerations
• Maintenance and Testing Requirements

4. International Standards

• Importance and Relevance to Specifications
• ANSI and IEEE
• IEC and IEE
• Circuit Breakers and Power System