Understanding High-Voltage Circuit Breaker Nameplates — Part 2

Volney Naranjo, Megger Industry Topics, Spring 2022 Industry Topics

Along the extensive and complex electrical system infrastructure from generation to transmission and distribution, the wide variety of medium- and high-voltage circuit breakers (MV/HV CB) vary in size, interrupting medium, number of breaks per phase, and various other attributes. To help classify breakers and their attributes, they are all shipped with a nameplate stating the minimum information about specific mechanical, …

Understanding High-Voltage Circuit Breaker Nameplates

Volney Naranjo, Megger Industry Topics, Winter 2021 Industry Topics

Along the extensive and complex electrical system infrastructure from generation to transmission and distribution, the wide variety of medium- and high-voltage circuit breakers (MV/HV CB) vary in size, interrupting medium, number of breaks per phase, and various other attributes. To help classify breakers and their attributes, they are all shipped with a nameplate stating the minimum information about specific mechanical, …

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 …