Circuit Breakers & Switchgears: Safe Operation & Maintenance

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Venue Starting Date Duration Fees Join Now
Online - Virtual , 20240910 10 - Sep - 2024 2 Hrs X 8 Sessions $2,100 Register
Dubai - UAE , 20241118 18 - Nov - 2024 5 - Day $4,950 Register


Switchgear (circuit breakers) are critical components in electrical distribution systems and control of electrical power in manufacturing or power plant and in a utility distribution system, their operation significantly affects the overall performance of the system. It must be understood that there is an incredible variety of equipment used on MV switch gear today. Negligent maintenance practices can lead to power system inefficiency and loss of system reliability.

This workshop is designed to update participants with the latest development of Circuit Breakers and to present some of the more common and updated aspects of medium voltage switch gear maintenance. This course describes the essential information that any technician who works in distribution needs to know about CB types, operation and maintenance testing required for all types of MV CB.


The important features of the Circuit breakers & switch gears:Safe operation & maintenance training course are:

  • Developing a maintenance procedures of MV CBs
  • Understanding arc-phenomena and TRRV of CBs
  • Management of all hazards associated with CBs
  • Management related issues such as risk and safety


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.


This course is recommended for skilled trades, supervisors, and anyone involved in the maintenance of industrial power circuit breakers, especially:

  • Maintenance Engineers and supervisors,
  • Project Engineers,
  • Junior graduated Electrical Engineers.
  • Electrical Foreman’s and Technicians
  • And in general, Inspection, materials, safety and maintenance Electrical engineering team


The latest educational methods and strategies are employed. The course is designed to not only give the required fundamental knowledge but also to provide a strong background for all attendees towards practical industrial applications. The course will be highly interactive, with opportunities to advance your opinions and ideas. Participation is encouraged in a supportive environment. To ensure the concepts introduced during the course are understood, they will be reinforced through a mix of learning methods, including lecture style presentation, open discussion, case studies, simulations and group work.

Pre & Post course assessments will be used to measure the effectiveness of this training.


Module 1 -General Introduction and Industrial Switch gears

  • KeyTopics:

    • 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

Module 2 -CB Design Specification Based on Short Circuit Current Level

  • KeyTopics:

    • 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.

Module 3 - CB Design Specification Based on Arc Phenomena and Circuit Interruption and Safe Operation

  • KeyTopics:

    • 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

Module 4 - Modern MV Vacuum CB and CB

  • KeyTopics:

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

    Other Type of Circuit Breakers

    a) Air Circuit Breakers

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

    b) 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

Module 5 -Circuit Breaker Inspection, Maintenance and Services and CB Troubleshooting

  • KeyTopics:

    • Inspection and general inspection technical procedure
    • Daily inspection of circuit breakers
    • Monthly inspection of circuit breakers
    • Annual inspection of circuit breakers
    • Disassembly
    • Cleaning, tightening and lubrication
    • Equipments used in testing
    • Testing procedure and direct testing
      Contact resistance test.
    • Insulation resistance test
    • Test report and indirect testing
    • Low insulation Resistance (below 2000 M-„¦) between a) Phase terminal and earthed frame, with breaker closed b) Phase terminals of a pole.
    • Resistance between Terminals of Pole too high (above 100 µ) (15 µ per joint) contact
      Unequal contact Wipe and Travel in 3-pole Measured from top surface of interrupter flange and the contact lip by a simple rod with a) breaker open and b) breaker closed
    • One of the poles does 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).

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