MV/HV Circuit Breaker Testing Beyond Conventional Practices

Volney Naranjo, Megger Fall 2021 Industry Topics, Industry Topics

Conventional testing of medium- and high-voltage circuit breakers (MV/HV CBs) involves measuring the timing and travel of the main contacts and their corresponding resistors (pre- or post-insertion) if any, along with the current profile of the operating coils, and occasionally the timing of auxiliary contacts. This article explains several techniques available to improve or extend the scope of testing. Aspects …