basler electric 3 phase bus bar diff relay
basler electric 3 phase bus bar diff relay
(OP)
We have a switchboard with 2 feeders and a bus tie and and two basler 3 phase diff.relays protecting the switchboard.Every motor feeder has also a ct installed and all are daisy chained together.When starting a 500kw motor on 1 feeder and a bus tie closed the diff relay used trips on all phases.The relay only has a 2 cycle delay which I think is not long enough.Has anyone worked on this relay,and can help and has anyone a CT connection for this type of scheme.Thanks in advance





RE: basler electric 3 phase bus bar diff relay
RE: basler electric 3 phase bus bar diff relay
Excisting scheme (was always behaving correctly):
Faulty CT (Do mag-curve tests on CT's)
Broken wire on the protection scheme
Faulty relay
New installation:
Relay (Wrong settings, faulty relay, relay not correctly wired)
Scheme wrongly wired
CT's (Doesn't match, wrong polarity, faulty CT)
Except for wrong settings I would suspect a faulty CT.
www.basler.com for the relays
Ralph