Circuit Breaker Maintenance – Medium Voltage (Air And Vacuum)

Source: AVO Training Institute, Inc.


Unlike a low-voltage breaker, medium-voltage breakers rated at 1 kV or higher rely on external controls to operate effectively.  That means technicians have more components to test and maintain.  Failure of a breaker can cause damage to other equipment and is extremely hazardous to nearby personnel.  Properly trained technicians can alleviate these dangers and improve system performance.

This hands-on course is intended for new or experienced electricians and technicians that install, maintain, repair or troubleshoot air and vacuum metal-clad circuit breakers and switchgear, rated at 1kV and higher. The student should have basic knowledge of AC/DC electricity.  Students must wear long pants and safety toe shoes to complete the lab portion of this course.

Course duration: 3.5 days

2.8 CEU

Learning Objectives:

  • Identify components and insulation mediums for all circuit breakers (vacuum, air magnetic, oil and SF6)
  • Utilize appropriate personal protective equipment and safe work procedures including lockout/tagout
  • Evaluate breaker ratings for various applications
  • Interpret control schematics
  • Explain removal and restoration procedures
  • Adjust linkages, switches and contacts
  • Perform circuit breaker maintenance service per NETA specifications
  • Perform and evaluate the results of contact resistance, insulation resistance, leakage current, power factor, timing and bottle integrity tests

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