IEEE C37.119-2016 IEEE Guide for Breaker Failure Protection of Power Circuit Breakers.
3.1 Definitions backup protection: A protection scheme for the same zone of protection as the primary protection but may be slower and removes the same or additional equipment from service. Backup protection may be installed locally, i.e., in the same substation as the primary protection, or remotely. breaker failure protection (BFP): A form of protection that is designed to detect the failure of a circuit breaker to operate or to interrupt a fault. Upon detection of a breaker failure during a fault condition the scheme is designed to take appropriate action to clear the fault. Upon detection of a breaker failure during a non-fault condition, the scheme may take other appropriate action. control timer: A timer that limits the amount of time the breaker failure scheme is active after initiation. This is a time delay on pickup timer. common-mode failure: A multiple failure attributable to a common cause. critical clearing time: The longest time that fault conditions may persist before system stability is lost. local backup protection: A backup protection system that is in the same substation as the primary protection. However, it may use some of the same equipment, such as transducers, batteries, and circuit breakers as the primary protection and can therefore fail to operate for the same reasons as the primary protection. primary protection: The main protection system for a given zone of protection that operates in the fastest time and removes the least amount of equipment from service. remote backup protection: Historically, the first set of backup protection that was installed. It is completely independent of the relays, transducers, batteries, and circuit breakers of the primary protection system it is backing up by virtue of its physical location. Its advantage is that there are no common-mode failures that can affect both systems of protection.
IEEE C37.119 pdf download.