MBCi and unit protection
MBCi and unit protection
(OP)
Hello,
I have an 11kV substation that utilises Unit and O/C protection and has 6 ring feeders.
The unit protection used a mixture of Tranlsay H and SDP relays.
the relays are being replaced throughout with MBCis. If there is a pilot fault, will the MBCis initiate a trip at both end of the cable?
Thanks guys
I have an 11kV substation that utilises Unit and O/C protection and has 6 ring feeders.
The unit protection used a mixture of Tranlsay H and SDP relays.
the relays are being replaced throughout with MBCis. If there is a pilot fault, will the MBCis initiate a trip at both end of the cable?
Thanks guys






RE: MBCi and unit protection
RE: MBCi and unit protection
The Translay H Balanced voltage relay will not operate for an open circuit pilot, but should operate for a short circuit pilot.
The pilots are crossed when changing from a Balanced voltage to circulating current.