There is a rich history of circuit breaker types and technologies. Whether we are referring to arc-extinction methods, such as oil, air-blast, air magnetic, SF6, and vacuum, or we are referring to energy storage methods, such as mechanical springs, pneumatics, and hydraulics, the use and preference of these technologies have changed vastly over time. A newcomer, the magnetically actuated vacuum circuit breaker, has entered the scene. This circuit breaker is found in voltage classes between 15 kV and 34.5 kV, and eliminates the need for command coils, motors, and springs traditionally found in circuit breakers in this voltage class range. Instead, capacitors and a magnetic actuator are used in combination for the energy storage and delivery system. This change forces us to re-evaluate diagnostic testing specific to this circuit breaker. We now need to consider adding capacitor voltage and actuator current to our list of measured signals. Not only will these signals need to be measured, but also they will need to be properly analyzed. From a technical maintenance perspective, these additional signals provide critical information about the proper function and condition of the magnetically actuated vacuum circuit breaker. This easy-to-follow paper and presentation focuses on the new challenges associated with testing and the diagnostic challenges associated with magnetically actuated vacuum circuit breakers. The audience will be provided with an understanding, application, and analysis of these tests, supported by case studies.
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