MV Circuit Breakers And Switchgears Inspection, Maintenance, Design, Repair and Troubleshooting Course

Course Overview:

This course offers a practical introduction to industrial power circuit breakers (CBs) and switchgear, with a focus on their design, operation, maintenance, and troubleshooting.

During the course, participants will learn about voltage levels, the structure of circuit breakers, ground fault relay systems and molded case, vacuum, SF6, air, and oil types of circuit breakers. 

This course includes discussions of arc interruption theory, as well as performing short circuit calculations, inspection, testing, and troubleshooting. 

The course is designed for electrical engineers, technicians, and supervisors responsible for CBB maintenance and helps them understand how to safely, effectively, and reliably operate circuit breakers in an industrial context. A series of practical sessions and case studies supplement the theoretical material covered in the training.

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-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
• 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
• Double Pressure System
• Single Pressure Puffer-Piston System
• Single Pressure Self Blast System
• Improvement in SF6 Breakers for HV

Other Type of Circuit Breakers
Air Circuit Breakers

• Method of increasing arc resistance
• Plan break type
• Magnetic blow out type
• Arc splitter type
• Application
• Construction and operation
• Axial air CB
•  Blast air CB

Oil Circuit Breakers

• Arc rupture under oil
• Advantages of oil
• Disadvantages of oil
• Plan break oil circuit breakers
• Arc control circuit oil breakers
• Minimum oil circuit breakers
• Construction and operation

DC Circuit Breakers

• Construction
• Methods of interruption
• Application

Circuit Breaker Inspection, Maintenance and Services

• Inspection
• General inspection technical procedure
• Daily inspection of circuit breakers
• Monthly inspection of circuit breakers
• Annual inspection of circuit breakers
• Disassembly
• Cleaning
• Tightening
• Lubrication
• Equipments used in testing
• Testing procedure
• Direct testing
• Contact resistance test.
• Insulation resistance test
• Test report
• Indirect testing
• One hour Video, HV CB Maintenance and Repair

Circuit Breakers Control, Protection and Testing

• Switchgears control devices and wiring
• Switchgears protection devices and wiring
• Testing Classification
• Testing laboratories
• Description of a simple testing station

CB Troubleshooting

• Low insulation Resistance (below 2000 Mega-ohms) between a) Phase terminal and earthed frame, with breaker closed b) Phase terminals of a pole.
• Resistance between Termi¬nals of Pole too high (above 100 microhms) (15 micro-ohm per joint) contact
• Unequal contact Wipe and Travel in 3-pole Measured from top surface of inter¬rupter flange and the contact lip by a simple rod with a) breaker open and b) breaker closed
• One of the pole docs not close.
• Breaker operation too Slow During opening timing from trip command to contact separation instant too large (60 ms instead of say 40 ms)