Schweitzer Engineering Laboratories SEL-421-4 - Table 5.80 Circuit Breaker Failure Relay Word Bits

5.155
Date Code 20171021 Instruction Manual SEL-421 Relay
Protection Functions
Circuit Breaker Failure Protection
Table 5.80 Circuit Breaker Failure Relay Word Bits (Sheet 1 of 2)
Name
a
Description
BFI3P1 Three-pole circuit breaker failure initiation
BFIA1 A-Phase circuit breaker failure initiation
BFIB1 B-Phase circuit breaker failure initiation
BFIC1 C-Phase circuit breaker failure initiation
BFIN1 No current circuit breaker failure initiation
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