Dear,
In our G60 (Generator Protection) Relay, 50BF is pick many times, what could be reasons.
In our G60 (Generator Protection) Relay, 50BF is pick many times, what could be reasons.
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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...!!!
CB never failed to operate.Mehboob
1) Regarding the Gen'r "CB-Failed-To-Operate" Function, can you provide the 27 (Voltage-Relay) and 50 (Overcurrent-Relay) Logic diagram?
2) Do you also have a Gen'r "CB-Inadvertently-Operated" Function?
Regards, Phil Corso
Dear Sir,Mehboob
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
by Seth Price