Sel SEL-421 - Page 165

R.1.123
Date Code 20111215 Reference Manual SEL-421 Relay
Protection Functions
Circuit Breaker Failure Protection
BFILC1 Load current breaker failure initiation
BFI3PT1 Three-pole circuit breaker failure extended initiation
BFIAT1 A-phase circuit breaker failure extended initiation
BFIBT1 B-phase circuit breaker failure extended initiation
BFICT1 C-phase circuit breaker failure extended initiation
FBFA1 A-phase circuit breaker failure
FBFB1 B-phase circuit breaker failure
FBFC1 C-phase circuit breaker failure
FBF1 Circuit breaker failure
NBF1 No current/residual current circuit breaker failure
LCBF1 Load current circuit breaker failure
BLKFOA1 Block A-phase flashover detection
BLKFOB1 Block B-phase flashover detection
BLKFOC1 Block C-phase flashover detection
FOA1 A-phase flashover detected
FOB1 B-phase flashover detected
FOC1 C-phase flashover detected
FOBF1 Flashover detected
RT3P1 Three-pole retrip
RTA1 A-phase retrip
RTB1 B-phase retrip
RTC1 C-phase retrip
RT1 Retrip
RTS3P1 Three-pole current supervised retrip
RTSA1 A-phase current supervised retrip
RTSB1 B-phase current supervised retrip
RTSC1 C-phase current supervised retrip
50FA1 A-phase current threshold
50FB1 B-phase current threshold
50FC1 C-phase current threshold
50R1 Residual current threshold
50LCA1 A-phase load current threshold
50LCB1 B-phase load current threshold
50LCC1 C-phase load current threshold
50FOA1 A-phase flashover current threshold
50FOB1 B-phase flashover current threshold
50FOC1 C-phase flashover current threshold
BFTRIP1 Breaker 1 circuit breaker failure trip
a
For Circuit Breaker 2, replace 1 with 2 in the setting label.
Table 1.75 Circuit Breaker Failure Relay Word Bits
a
(Sheet 2 of 2)
Name Description