Start Date:26 Apr,2026
End Date: 30 Apr,2026
Duration: 5 Days
Overview:
This program is designed to update participants with the latest development of Circuit Breakers and to present some of the more common and updated aspects of low, medium and high voltage switchgear maintenance.
Course Objectives:
This course is designed to enable participants to:
List the voltage convention classifications used in this course.
Describe switchgear construction.
Describe a ground fault relay system.
Describe the three basic types of low and medium-voltage circuit breaker contacts.
Describe the moulded case circuit breaker
Course Content:
1. General Introduction
Electrical Engineering Basic Concepts
Three-phase review and per unit
Voltage levels
One-line and three-line diagrams
Generation system layout
Transmission system layout
Substation system layout
Distribution system layout
2. Industrial Switchgears
Fuses
Auto-recloses
Automatic sectionalizer
Circuit Breakers
Isolator switches
Load switches
Relays
Current transformer
Voltage transformers
3. CB Design Specification Based on Short Circuit Current Level
Per unit system
Faults in power systems
Transient phenomena in power systems.
Symmetrical component analysis of a three-phase network
Network connection for various fault types
Current and voltage distribution in the system due to a fault
Effect of the system on zero sequence quantities
Computer programs based on short-circuit calculation.
4. CB Design Specification Based on Arc Phenomena and Circuit Interruption
Arc phenomena
Maintenance of the Arc
Properties of Arc
Arc Interruption Theory
Circuit Breaker Rating
Circuit constants and circuit conditions
Conditions of severity
Restriking voltage transient
Class A ultra-fast transients
Class B system transients
Class C low transients
Transmission line transient
Switching transients
Duties of Switchgear
5. LV Circuit Breakers
Low-voltage moulded case current limiting circuit breakers
Low-voltage moulded case circuit breakers with high breaking capacity
Insulated case circuit breakers
Low-voltage air circuit breakers
Low-voltage circuit breakers specification
6. Modern MV and HV Vacuum CB
Introduction
Advantages of vacuum interruption
Vacuum contactors and interrupters
The vacuum medium
The vacuum arc
Vacuum arc stability
Vacuum breakdown
Vacuum switch construction
Applications of vacuum circuit breakers
7. Modern MV and HV SF6 CB Introduction
Basic Features of SF6 Breakers
Dielectric properties of SF6
Quenching properties of SF6
Construction of SF6 breaker
SF6 CB types
Puffer-type SF6 breakers
Double Pressure System
Single Pressure Puffer Piston System
Single-Pressure Self-Blast System
Improvement in SF6 Breakers for HV
Targeted Audience:
Electricians
Electrical supervisors
Plant electricians
Operations & maintenance engineers, supervisors & technicians
Maintenance technicians
