CBMMV-300-3.5 DAYS-2015-FINAL
Circuit Breaker Maintenance, Medium-Voltage
3.5 Days, 2.8 CEUs
Learning Objectives:
Medium-voltage circuit breakers rated at 1 kV or higher rely on
external controls to operate effectively. That means technicians
have more components to test and maintain to ensure a 3 to 5
cycle operating time. Failure of one of these circuit breakers
can cause catastrophic damage to other equipment and can be
extremely hazardous to nearby personnel. Technicians can ensure that tripping operations execute as required for equipment
protection with safe and proper maintenance. In addition to
improving electrical system reliability, well maintained circuit
breakers also minimize the arc flash hazard energy levels that
technicians can be exposed to during a fault.
This course provides training for the performance of visual,
mechanical and electrical inspections, in accordance with manu­
facturers’ and NETA MTS requirements.
Who Should Attend
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 1 kV and higher. The participant should have basic knowledge
of AC/DC electricity.
Upon completion of this course, the participant should be
able to:
• Identify components and insulation mediums for
vacuum and air magnetic circuit breakers
• Utilize appropriate personal protective equipment and
safe work procedures including lockout/tagout (LOTO)
• 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
manufacturer and NETA MTS specifications
• Perform and evaluate the results of contact resistance,
insulation resistance, leakage current, power factor, and
bottle integrity tests
Participants must wear long pants and safety toe shoes to complete the lab portion of this course.
SCOPE
Day 1*
Day 2
Day 3
I.
Introduction, Paperwork
and Test
II.
Circuit Breaker Fundamentals
A. Circuit Breaker Functions
B.Ratings
C. The Interrupting Rating
D. Principles of Arc Interruption
E. Insulation Media:
Breakers Categorized by Insulation
Media
1. Air Circuit Breaker
2. Vacuum Circuit Breaker
3. Sulphur Hexafluoride
(SF6) Breaker
III.
VI.
F.
Contacts
G. Insulation Requirements
H. Circuit Breaker Controls
I. Methods of Operation
J.Maintenance
K. Lab 1 – Switchgear Maintenance
*Class scheduling times may vary based on
discussions and size of class
Circuit Breaker Testing
A. Contact Resistance
B. Insulation Resistance
C. Operation and Timing Tests
IV. Air Circuit Breakers
A. Description of Operation
(GE Magne-Blast®)
B. Adjustments
C. Periodic Inspection and
Maintenance
D.Lubrication
E. Elementary Wiring Diagram
V. Westinghouse Type DHP
Air Circuit Breakers
A.Description
B.Operation
C. Adjustments
D. Periodic Inspection and
Maintenance
E. Lab 2A – Air Circuit Breaker
Maintenance
F. Lab 2B – Performing an Insulation
Resistance on and Hipotting AirCircuit Breakers
Vacuum Circuit Breakers
A. Principles of Operation
B. Major Components
C. Maintenance Notes
D. Lab 3 – Power Factor Testing
(Oil Circuit Breaker)
E. Lab 4 – Vacuum Circuit Breaker
Testing
VII. Paperwork and Test