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Circuit Breaker Ratings – A Primer for Protection Engineers

This paper prepared by Bogdan Kasztenny, Schweitzer Engineering Laboratories, Inc., and Joe Rostron, Southern States, LLC which was presented at the 71st Annual Conference for Protective Relay Engineers and can be accessed at here.

This paper "Circuit Breaker Ratings – A Primer for Protection Engineers" deals primarily on high voltage circuit breakers:

This paper explains the impact of the fault current dc component on the breaker asymmetrical current interrupting rating. The longer the dc time constant, the higher the dc value at the time of contact parting, and the harder it will be for the breaker to interrupt the current. Similarly, the faster the relay, the higher the dc value at the time of contact parting, and the harder it will be for the breaker. At the same time, the slower the breaker, the smaller the dc value at the time of contact parting, the easier the current interrupting process, and the smaller the impact of the relay operating time on this process.

Author

  • A Filipino Engineer, Registered Professional Engineer of Queensland (RPEQ) - Australia, and Professional Electrical Engineer (PEE 2574 - 1st Place April 1991) - Philippines with extensive experience in concept selection, front-end engineering, HV & LV detail design, construction, and commissioning of Hazardous and Non-Hazardous Area electrical installations in water and wastewater pipeline and pumping facilities, offshore platforms, hydrocarbon process plants and pipelines including related facilities. Hazardous area classification and design certification (UEENEEM015B, UEENEEM016B, UEENEEM017B).

A Filipino Engineer, Registered Professional Engineer of Queensland (RPEQ) - Australia, and Professional Electrical Engineer (PEE 2574 - 1st Place April 1991) - Philippines with extensive experience in concept selection, front-end engineering, HV & LV detail design, construction, and commissioning of Hazardous and Non-Hazardous Area electrical installations in water and wastewater pipeline and pumping facilities, offshore platforms, hydrocarbon process plants and pipelines including related facilities. Hazardous area classification and design certification (UEENEEM015B, UEENEEM016B, UEENEEM017B).

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