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PC37.119 - Guide for Breaker Failure Protection of Power Circuit Breakers

This guide assists the relay engineer in understanding the application considerations when applying breaker failure protection (BFP) to power circuit breakers.This guide describes methods to protect a power system from faults that are not cleared because of failure of a power circuit breaker to operate or interrupt when called upon by a protective relay, It provides the user with 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. Additionally, schemes which provide primary protection of the power system from performance failures of the power circuit breaker other than fault clearing failures such as failure to operate, either tripping or closing, manual or automatic, are also described. Such schemes when applied are typically integrated as a part of the overall breaker failure protection scheme. Also covered are recent practices which take advantage of microprocessor based relay technologies to enhance breaker failure protection such as by using peer to peer communication over a LAN, by using additional switchyard measurements, by integrating the breaker failure protection with the primary protection, and by applying multiple schemes within a single breaker failure relay.
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