The purpose of this intense five-day course is to provide participants with the most recent advancements in circuit breaker technology as well as an overview of some of the more popular and modernized parts of maintaining low-, medium-, and high-voltage switchgear. It is imperative to acknowledge that a vast array of equipment is now utilized on low, medium, and high voltage switchgear. In a utility distribution system as well as in a manufacturing or power plant, switchgears are crucial to the distribution and control of electrical power. Ineffective maintenance procedures can result in a power system's loss of dependability and efficiency. In certain regions of an older facility, switchgear from the 1940s may be present, while other sections may have been rebuilt with more recent switchgear. This program will provide

Course Objectives:

By the end of the training, participants will be able to:

Design, inspect, maintain, repair and troubleshoot circuit and switchgears
Apply in-depth knowledge and skills on LV/MV/HV circuit breakers and switchgears
Describe switchgear details such as ratings, degree of protection, service conditions and ancillary equipment
Explain switchgear asset management including CBM and RCM process, tripping devices, maintenance and testing
Apply load and fault calculation to decide the task of protection system and the operating conditions of the power system
Explain circuit breaker control circuits, types and application of protective relays, the structure of control circuits and the use and application of current and voltage transformers
Discuss circuit breaker characteristics in relation to protection control circuits, selectivity, sensitivity and speed of the control circuits

Who Should Attend?

This course is intended for all Engineers and other Technical Staff who need a sound understanding of Low, Medium and High Voltage Switchgear and Circuit Breaker design, inspection, maintenance, repair and troubleshooting.

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-reclosers
Automatic sectionalizer
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 power system
Symmetrical component analysis of three phase network
Network connection for various fault types
Current and voltage distribution in system due to a fault
Effect of system on zero sequence quantities
Computer programs based 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
Re striking voltage transient
Class A ultrafast 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