Circuit Breaker Maintenance – Medium Voltage (Air And Vacuum)
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
- 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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