Mv Circuit Breakers: Design, Application and Maintenance Course

Course Overview:

This course prepares its attendees for the inspection, testing, and maintenance of low and medium voltage circuit breakers (CBs).

The course involves learning how to apply manufacturer’s instructions and industry standards for performing insulation resistance, contact resistance, high current injection, and high potential tests.

Power factor/dissipation factor testing medium voltage breaker is also part of the course. 

The course introduces circuit engineers, supervisors, and technicians with the theory of interruption of circuits, fault types, protective devices and relays, arc flash and safety, and maintenance problems. Up-to-date practical troubleshooting techniques using IEC/ANSI standards achieve reliable and effective reliability of CB pens.

Course Objectives:

·         Use manufacturer instruction literature and established industrial standards to perform required inspection, checks, lubrication, and adjustments on both low and medium voltage circuit breakers.

·        How to perform insulation resistance test on both low and medium voltage circuit breakers and interpret test data.

·        How to perform contact resistance test on both low and medium voltage circuit breakers and interpret test data.

·        How to perform a high current primary injection test on low voltage circuit breakers and interpret test data.

·        How to perform high potential test on medium voltage circuit breakers and interpret test data.

·        How to perform a power factor / dissipation factor test on medium voltage air & vacuum circuit breakers and interpret test data

Who Should Attend?

• Electric maintenance & design Engineers.
• Project Engineers.
• Electrical supervisors.
• Senior technicians & formans.
• Technical support Engineers

Course Outlines:

• Circuit interrupters up to 34.5 kV.
• Switching problems.
• Fault analysis (simple methods, Symmetrical components & PU systems).
• Breaking and making capacities.
• Theory of circuit interruption with different switching mediums.
• Circuit breaking under unfavorable operating conditions.
• Circuit interruption in different mediums (OCB, VCB, Sf6 CB & ACB)
• Ratings & de-ratings of Circuit breakers.
• Anti-pumping & trip supervision relays.
• Safety features of MV switchboards.
• Comparison of interrupting devices.
• Operating mechanisms.
• Protective relay fundamentals.
• Arc flashing & Electric hazards.
• Authorizations for operation MV switchgear.
• Tests & commissioning of MV switchgear.
• Trouble shooting of different circuit breaker failures.
• Preventive maintenance of MV CBs.
• Maintenance work instructions.
• Related IEC/ANSI standards.