IEEE C37.119-2005
IEEE Guide for Breaker Failure Protection of Power Circuit Breakers
standard by IEEE , 03/06/2006
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About This Item
Full Description
Scope
This guide is intended to help the relay engineer understand the application considerations when applying breaker failure protection (BFP) to power circuit breakers. The discussion is limited to those instances where the breaker does not clear the fault after a protective relay has issued a command to open (trip) the circuit breaker. Failure to close, failure while closed, and failure while open are not discussed. The intent of this guide is not to give the reader methods of protecting a power circuit breaker from failing; rathere, it is to give the reader a guide in how to detect that a breaker has failed to clear a fault, and how to electrically isolate the fault after the breaker has failed to clear the fault.
Purpose
Currently, there are no guidelines for applying breaker failure protection. The last IEEE PSRC document was a Summary Update of Practices written in March of 1981. A guide needs to be written to help engineers arrive at the proper breaker failure protection scheme for their system.
Abstract
New IEEE Standard - Superseded.
This guide compiles information on the application considerations for breaker failure protection. The reasons for local backup protection are described. Breaker failure schemes are discussed. Issues relating to the settings of current detectors and timers are discussed for various applications.
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