Circuit Breakers and Switchgears Inspection

Date Format Fees  
28 May - 31 May, 2024 Classroom ₦350,000 Register
19 Nov - 22 Nov, 2024 Classroom ₦350,000 Register
28 May - 31 May, 2024 Classroom ₦350,000 Register

Event Details

Participants in the Circuit breakers & switch gears training course will be able to:

  • List the voltage convention classifications used in this course.
  • Describe switch gear construction.
  • Describe the four basic types of medium voltage circuit breakers.
  • How to read MV CB nameplate? And be able to select circuit breaker specification
  • Understand the arc phenomena and circuit interruption.
  • Know the different types of circuit breakers and industrial switch gears.
  • Know the maintenance procedures.
  • How to maintain and operate MV circuit breakers.
  • Various tests on MV CBs (type/routine/special and field tests)
  • Be aware of safe working practices.



General Introduction and Industrial Switch gears

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


CB Design Specification Based on Short Circuit Current Level

  • Faults on power systems
  • Transient phenomena in power system.
  • Symmetrical component analysis of three phase network
  • Network connection for various fault types
  • PU system
  • Current and voltage distribution in system due to a fault
  • Effect of system on zero sequence quantities
  • MVA method
  • Computer programs based short circuit calculation


CB Design Specification Based on Arc Phenomena and Circuit Interruption and Safe Operation

  • Parts of MVCB (charging spring motor, closing coil, trip coil, and anti-pump relay operation, etc).
  • 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
  • Circuit breaker mechanisms
  • Switching transients
  • Duties of Switchgear
  • Safety Policies & Electrical Hazards
  • Safety rules
  • Authorization levels
  • Safety documents
  • Hazardous associated with electrical equipments
  • Electrical hazards & Shock to human
  • Arc Flashing hazards (IEEE 1584)
  • Incident energy
  • Boundary distances
  • Labeling
  • PPE
  • Approved & Standard organizations


Modern MV Vacuum CB and CB

  • Introduction to CBs
  • Advantages of vacuum interruption
  • Vacuum contactors and interrupters
  • The vacuum medium and the vacuum arc
  • Vacuum arc stability
  • Vacuum break down
  • Vacuum switch construction
  • Applications of vacuum circuit breakers
  • Basic Features of Breakers
  • Dielectric properties of
  • Quenching properties of
  • Construction of breaker
  • Puffer type breakers
  • Double Pressure System
  • Single Pressure Puffer-Piston System
  • Single Pressure Self Blast System



Works, Services and Maintenance Personnel



The training methodology combines lectures, discussions, group exercises and illustrations. Participants will gain both theoretical and practical knowledge of the topics. The emphasis is on the practical application of the topics and as a result participant will go back to the workplace with both the ability and the confidence to apply the techniques learned to their duties.


  • Venue

    Alpha Partners Professional Training Conference Centre. 200, Muritala Mohammed Way (3rd Floor), Yaba Lagos.

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