Breaker close or trip is Ok.Mehboob,
Breaker failure protection can take many forms. In my experience, it's usually a means of monitoring the electrical circuits that can be used to close and--most importantly--open ("trip") a critical circuit breaker. And, often, a loose wire or a bad crimp or a bad connection or a failed or failing close- or trip solenoid can cause these repeated "failure" alarms.
Best to get this problem investigated and resolved as quickly as possible--because an inability to open a critical circuit breaker can result in very serious damage, and even harm or death to nearby humans...!!!
It is very unlikely that false tripping is caused by the Input devices, i.e., the 27 or 50, because the probability of 2 input-devices failing simultaneously is extremely low. I suggest you address the BF output-action device or circuit, especially the timer, if so equipped.
Additionally, try to correlate the time of the false-trips, to other physical occurrences, as CSA suggested, like slamming of a cabinet door, or movement of a heavy truck in the vicinity of the building housing the equipment.
I remember an incident where every time someone passed thru a door in a wall on which a relay cabinet was mounted the power plant tripped. The fix was to nail the door shut using 2x4's !
BTW, if anyone is interested in ridiculous false-trip situations search Automation.Control archives ! The most exciting one for me was false-tripping of an LNG plant during 2nd shift-change on Tuesdays. Went on for weeks ! It resulted in a 100-M$, 400-ft flame, on a 400-ft stack, in the middle of a very popular tourist location !
Regards, Phil Corso
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