INFO ABOUT BBC INTERPOSING XFMRS FOR 87T PROTECTION
INFO ABOUT BBC INTERPOSING XFMRS FOR 87T PROTECTION
(OP)
I'M DOING THE CALCULATIONS OF THE SETTINGS FOR THE PROTECTION RELAYS ASSOCIATED TO A 33MVA (24/13,8 kV) GROUNDED WYE AUTOTRANSFORMER.
AWE HAVE A OLD BBC D21se RELAY AS A DIFFERENTIAL PROTECTION WITH INTERPOSING XFMR FOR THE CURRENTS OF THE 24 and 13,8 kV SIDES. THE ONLY DATA THAT I HAVE OF THAT INTERPOSING XFMR ARE THE FOLLOWING..
MANUFACTURER: BROWN BOVERI CORPORATION (BBC)
Typ W1 23 DS
HE 688691
I= 8...1,2 / 5-2,8-1-0,577
FROM THIS DATA I KNOW THAT THE CURRENT OF THE CT PRIMARY GOES FROM 8 TO 1,2A AND FOR THE SECONDARY I HAVE 5;2,8;1 OR 0,577A.
I WAS TRIYNG TO FIND INFORMATION ABOUT THESE INTERPOSING XFMR BUT I DID NOT FIND ANYTHING. I NEED A MANUAL OR SOMETHING THAT CAN SHOW THE CONNECTION DIAGRAMS FOR THE PRIMARY AND SECONDARY WINDINGS AND AVALAIBLE CURRENT TRANSFORMER RATIO.
THANKS BEFOREHAND FOR YOUR HELP.
AWE HAVE A OLD BBC D21se RELAY AS A DIFFERENTIAL PROTECTION WITH INTERPOSING XFMR FOR THE CURRENTS OF THE 24 and 13,8 kV SIDES. THE ONLY DATA THAT I HAVE OF THAT INTERPOSING XFMR ARE THE FOLLOWING..
MANUFACTURER: BROWN BOVERI CORPORATION (BBC)
Typ W1 23 DS
HE 688691
I= 8...1,2 / 5-2,8-1-0,577
FROM THIS DATA I KNOW THAT THE CURRENT OF THE CT PRIMARY GOES FROM 8 TO 1,2A AND FOR THE SECONDARY I HAVE 5;2,8;1 OR 0,577A.
I WAS TRIYNG TO FIND INFORMATION ABOUT THESE INTERPOSING XFMR BUT I DID NOT FIND ANYTHING. I NEED A MANUAL OR SOMETHING THAT CAN SHOW THE CONNECTION DIAGRAMS FOR THE PRIMARY AND SECONDARY WINDINGS AND AVALAIBLE CURRENT TRANSFORMER RATIO.
THANKS BEFOREHAND FOR YOUR HELP.






RE: INFO ABOUT BBC INTERPOSING XFMRS FOR 87T PROTECTION
see attached manual of this relay, maybe you found something, information about interposing CT, I think, possible found only in Baden, Swiss.
Try ask your local ABB.
I have some very old catalog of BBC, tomorrow will check.
RE: INFO ABOUT BBC INTERPOSING XFMRS FOR 87T PROTECTION
Right now I'm checking the relay manual and it shows some basic information about the interposing xfmrs. I hope that you find something in your old BBC catalog.
RE: INFO ABOUT BBC INTERPOSING XFMRS FOR 87T PROTECTION
please find attached, sorry not best quality.
RE: INFO ABOUT BBC INTERPOSING XFMRS FOR 87T PROTECTION