Day 1: Introduction to Circuit Breakers

• o What is a Circuit Breaker?
• o Role of Circuit Breakers in Electrical Systems
• o Types of Circuit Breakers:
•  Molded Case Circuit Breakers (MCCBs)
•  Air Circuit Breakers (ACBs)
•  Miniature Circuit Breakers (MCBs)
•  Vacuum Circuit Breakers (VCBs)
•  Oil Circuit Breakers (OCBs)
•  SF6 Circuit Breakers
• o Components of Circuit Breakers
•  Contacts, Arc Extinguishing Mechanisms
•  Operating Mechanism (Manual vs. Automatic)
•  Trip Units and Sensors

Day 2: Understanding Circuit Breaker Schematic Diagrams

• o Introduction to Electrical Schematics
• o Symbols and Notations Used in Circuit Breaker Diagrams
•  Contacts, Coils, and Switches
•  Relay and Trip Circuit
• o Key Components in Circuit Breaker Diagrams:
•  Main Contacts
•  Auxiliary Contacts
•  Trip Circuit and Overload Protection
• o Interpreting Common Circuit Breaker Schematics
•  Series, Parallel, and Series-Parallel Configurations
•  Multi-pole Circuit Breakers
• o Reading Manufacturer’s Wiring Diagrams
• Circuit Breaker Control and Protection Circuits
• o Control Circuit Basics
• o Protection Circuits: Overload, Short-circuit, and Earth Fault Protection
• o Types of Tripping Mechanisms:
•  Thermal, Magnetic, and Hybrid Tripping
• o Schematic Representation of Protection Circuits
• o Examples of Control Schematics for Specific Applications

Day 3: Troubleshooting Circuit Breakers

• o Common Circuit Breaker Failures:
•  Failure to Trip
•  Failure to Close
•  Overheating
•  Contact Wear and Arcing
• o Tools and Equipment for Troubleshooting
•  Multimeter, Clamp Meter, Insulation Tester
•  Circuit Breaker Testers
• o Step-by-Step Troubleshooting Procedure
•  Visual Inspection and Preliminary Checks
•  Electrical Testing of Contacts and Trip Mechanisms
•  Diagnostics of Control Circuits
• o Safety Considerations During Troubleshooting
•  Lockout/Tagout Procedures
•  Personal Protective Equipment (PPE)

Day 4: Circuit Breaker Maintenance and Repair

• o Importance of Regular Maintenance
• o Routine Inspection and Testing
• o Cleaning and Lubrication Procedures
• o Replacing Worn or Damaged Components
• o Calibrating Trip Settings and Adjustment
• o Understanding Manufacturer Guidelines for Maintenance
• Advanced Circuit Breaker Troubleshooting Techniques
• o Advanced Fault Diagnosis: Thermal and Magnetic Protection
• o Troubleshooting in Large Power Systems
• o Identifying Faults in Tripping and Closing Mechanisms
• o Analyzing Circuit Breaker Performance under Load Conditions
• o Case Studies: Real-world Troubleshooting Scenarios

Day 5 : Case Studies and Hands-on Exercises

• o Hands-on Exercises with Various Types of Circuit Breakers
• o Interpreting Schematic Diagrams in Group Exercises
• o Real-life Troubleshooting Scenarios and Solutions
• o Q&A and Group Discussions