Circuit breakers play an important role in the safe distribution of electrical power. The equipment needs to be operated, maintained, and installed in a safe manner securing continuity of supply to consumers. This following are important aspects of the circuit breakers:
- Electric power systems are designed to be as fault-free as possible through appropriate network design, equipment design, proper installation, and on-going maintenance.
- The Circuit breaker and its associated fault detection equipment, protective relaying, is an extremely important device, through its role of clearing short-circuit currents, disconnecting faulty elements from the power network, and thus maintaining the overall integrity of the power network.
- If faults are not controlled they can cause unnecessary loss of electricity service with all of its many ramifications
- The circuit breaker selection and arc extinction methods are of great importance
- Minimizing downtime by a proper and systematic maintenance program
- The course focuses mainly on the operation and maintenance of circuit breakers, with reference to auxiliary equipment incorporated for its reliable and safe operation.
- The importance of preventive maintenance check and servicing of the various types of circuit breakers
- Implementation of safe systems of work and operations
- Co-ordination of maintenance activities and maintaining system safety
- To be able to understand the component functionalities of the gas and vacuum circuit breakers
- Methods of arc extinction for MV HV circuit breakers
- Routine inspections and the functions of the microprocessor component in the circuit breakers
By the end of the training, participants will be able to:
- Learn the importance of preventive maintenance check and servicing of the various types of circuit breakers
- Gain detailed information on the implementation of safe systems of work and operations
- Co-ordination of maintenance activities and maintaining system safety
- Understand the component functionalities of the gas and vacuum circuit breakers
- Familiarize with the methods of arc extinction for MV HV circuit breakers
- Familiarize with the routine inspections and the functions of the microprocessor component in the circuit breakers
DAY 1
Introduction - Reasons for Faults - and Classification of Faults
- The distinction between load and fault current
- Sources of short-circuit current
- Introduction to fault calculations
- Balanced and unbalanced faults
DAY 2
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
DAY 3
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
- D.C. circuit breaking
- A.C. 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 requirements
DAY 4
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
- International Standards
- Importance and relevance to specifications
- ANSI and IEEE
- IIEC and IEE
DAY 5
Circuit Breakers and Power System
- Circuit breaker failure and the effects on power system operation
- Circuit breaker inspection, testing, and maintenance program
- The Principles of modern substation control systems
Power circuit breaker mainte
This course is intended for all Electrical Staffs.