Upon completion of this course, the student will be qualified to:

• Understanding of the operational characteristics of MV switchgear.
• Understanding of troubleshooting procedures, as applied to MV switchgear.
• Improved capability in the use of test equipment.
• Better understanding of failure modes and failure analysis as applied to fuses, circuit breakers and switchgear. In relation to air break, vacuum and SF6 devices.
• Know the different types of circuit breakers and industrial switchgears
• Refreshed awareness of electrical safety concerns within substations and control centres
• Ability to determine fault levels in substations
• Demonstrate the maintenance, testing procedures used for separate voltage switchgear

The course is designed for Electrical engineers, supervisors and technicians.

This interactive Training will be highly interactive, with opportunities to advance your opinions and ideas and will include;

Lectures
Workshop & Work Presentation
Case Studies and Practical Exercise
Videos and General Discussions

Day-1

General Introduction

• 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

Switchgears equipment

• Fuses
• Auto-reclosers
• Automatic sectionalizer
• Circuit Breakers
• Isolator switches
• Load switches
• Relays
• Current transformers
• Voltage transformers

Day-2

Medium Voltage 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 Medium Voltage SF6 CB

• 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

Day-3

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

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.

Day-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

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
• Contact resistance test.
• Insulation resistance test
• Test report

Day-5

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
• Resistance between terminals
• Unequal contact wipe and travel in 3-pole
• Phase terminal and earthed frame, with breaker closed
• Phase terminals of a pole.
• One of the pole doesn’t close.
• Breaker operation too Slow

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