Breaker Failure Clearing
Breaker Failure Clearing
(OP)
Hi All,
The utility that I work for has as a standard practice to open the disconnects of a failed breaker ASAP in order to restore the bus or other breakers that needed to clear the failed one. We have been hearing recently that some of our neighboring compnanies have been electing to leave the cleared bus/bkrs open during this process. I am wondering if anybody has experience doing this and what the pros/cons are? To me it makes sense to restore the cleared bkrs as soon as realistically possible.
Thanks in Advance!
The utility that I work for has as a standard practice to open the disconnects of a failed breaker ASAP in order to restore the bus or other breakers that needed to clear the failed one. We have been hearing recently that some of our neighboring compnanies have been electing to leave the cleared bus/bkrs open during this process. I am wondering if anybody has experience doing this and what the pros/cons are? To me it makes sense to restore the cleared bkrs as soon as realistically possible.
Thanks in Advance!






RE: Breaker Failure Clearing
Assuming this is a breaker-and-a-half scheme with motor-operated disconnects and a relaying scheme that operates the disconnects automatically, the bus cannot be reenergized while the disconnects are being opened.
RE: Breaker Failure Clearing
RE: Breaker Failure Clearing
I should have clarified myself after re-reading. Yes the switches are motor-mech operated. Our current practice is to automatically open the switches in order to clear the stuck bkr and then reclose the bkrs that opened to clear the bus. The resultant is that the fault bkr is isolated by the automatic switches. It seems our neighbors have been electing to not open the switches automatically and reclose the bus but rather leave the bus open until personell have arrived at the station.
AusLee,
I can see this as a definite problem. The operations I am talking about would be over in 90seconds so unless people were working in the station at the time of failure then that would not apply. Am I understanding that your company operates on one-shot and do not reclose anything? Or is this just for Bkr failure?