Challenges While Testing Magnetically-Actuated Vacuum CBs

Why is it challenging to test magnetically-actuated vacuum circuit breakers?

Magnetically-actuated vacuum circuit breakers, found in the medium-voltage class, work with a relatively new technology. While eliminating several moving parts, they use capacitors and a magnetic actuator in combination for the energy storage and delivery system instead. As a consequence, diagnostic testing specific to this circuit breaker must be re-evaluated. Additional parameters need to be measured and properly analyzed.

Our paper of the month describes the new challenges associated with diagnostic testing of magnetically-actuated vacuum circuit breakers. It provides an understanding, application, and analysis of the necessary tests, and is supported by case studies.