This program aims to provide participants with an up-to-date understanding of Circuit Breakers and covers various aspects of low, medium, and high voltage switchgear maintenance. The program recognizes the diverse range of equipment used in switchgear across different voltage levels and emphasizes the importance of proper maintenance practices.

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 molded case circuit breaker.

Who Should Attend?

This course is recommended for skilled trades, supervisors, Electrical Engineers and anyone involved in the Maintenance of industrial power circuit breakers.

Course Outlines:

General Introduction

Electrical engineering basic concepts
Three-phase review and per unit
Voltage levels
One line and three line diagram
Generation system layout
Transmission system layout
Substation system layout
Distribution system layout

Industrial Switchgears

Fuses
Auto-recloses
Automatic sectionalized
Circuit Breakers
Isolator switches
Load switches
Relays
Current transformers
Voltage transformers

CB Design Specification Based on Short Circuit Current Level

Per unit system
Faults on power systems
Transient phenomena in the power system.
Symmetrical component analysis of 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.

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

LV Circuit Breakers

Low voltage molded case current limiting circuit breakers
Low voltage molded case circuit breakers with high breaking capacity
Insulated case circuit breakers
Low voltage air circuit breakers
Low voltage circuit breakers specification

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 break down
Vacuum switch construction
Applications of vacuum circuit breakers

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

Filters