11.16
SEL-421 Relay Instruction Manual Date Code 20171021
Relay Word Bits
Alphabetical List
BM2CLSA Circuit breaker monitor A-Phase close, Circuit Breaker 2 (SELOGIC control equation) 85
BM2CLSB Circuit breaker monitor B-Phase close, Circuit Breaker 2 (SEL
OGIC control equation) 85
BM2CLSC Circuit breaker monitor C-Phase close, Circuit Breaker 2 (SEL
OGIC control equation) 85
BM2TRPA Circuit breaker monitor A-Phase trip, Circuit Breaker 2 (SEL
OGIC control equation) 85
BM2TRPB Circuit breaker monitor B-Phase trip, Circuit Breaker 2 (SEL
OGIC control equation) 85
BM2TRPC Circuit breaker monitor C-Phase trip, Circuit Breaker 2 (SEL
OGIC control equation) 85
BNC_BNP Bad jitter on BNC port and the IRIG-B signal is lost afterwards 212
BNC_OK IRIG-B signal from BNC port is available and has sufficient quality 212
BNC_RST Disqualify BNC IRIG-B high-accuracy time source 212
BNC_SET Qualify BNC IRIG-B high-accuracy time source 212
BNC_TIM A valid IRIG-B time source is detected on BNC port 213
BNCSYNC Synchronized to a high quality BNC IRIG source 213
BPS Trip logic B-Phase selected 54
BRKENAB Asserted to indicate breaker control enable 208
BSYNBK1 Block synchronism check for Circuit Breaker 1 39
BSYNBK2 Block synchronism check for Circuit Breaker 2 41
BTX Block extension picked up 60
CBADA Unavailability threshold exceeded for M
IRRORED BITS Communications Channel A 229
CBADB Unavailability threshold exceeded for M
IRRORED BITS Communications Channel B 230
CC1 Circuit Breaker 1 close command 91
CC2 Circuit Breaker 2 close command 91
CHSG Settings group change 100
CNR1AG Control A-Phase composite current polarized right blinder 396
CNR1BG Control B-Phase composite current polarized right blinder 396
CNR1CG Control C-Phase composite current polarized right blinder 397
CNR1AB Control AB positive-sequence right blinder 398
CNR1BC Control BC positive-sequence right blinder 398
CNR1CA Control CA positive-sequence right blinder 398
CNR2AG Control A-Phase Ipa polarized right blinder 396
CNR2BG Control B-Phase Ipb polarized right blinder 396
CNR2CG Control C-Phase Ipc polarized right blinder 396
CNR2AB Control AB negative-sequence right blinder 398
CNR2BC Control BC negative-sequence right blinder 398
CNR2CA Control CA negative-sequence right blinder 398
COMPRM Communications-assisted trip permission 53
CPS Trip logic C-Phase selected 54
CVTBL CCVT transient blocking logic active 18
CVTBLH CCVT transient blocking logic active high-speed elements 18
DC1F DC Monitor 1 fail alarm 89
DC1G DC Monitor 1 ground fault alarm 89
DC1R DC Monitor 1 alarm for ac ripple 89
Table 11.1 Alphabetic List of Relay Word Bits (Sheet 16 of 34)
Name Description Row
To Next Page
