11.17
Date Code 20171021 Instruction Manual SEL-421 Relay
Relay Word Bits
Alphabetical List
DC1W DC Monitor 1 warning alarm 89
DC2F DC Monitor 2 fail alarm 89
DC2G DC Monitor 2 ground fault alarm 89
DC2R DC Monitor 2 alarm for ac ripple 89
DC2W DC Monitor 2 warning alarm 89
DELAY Unused 269
DFAULT Disables maximum/minimum metering and demand metering when SEL
OGIC control equation FAULT
asserts
52
DLDB1 Dead Line Dead Bus 1 47
DLDB2 Dead Line Dead Bus 2 47
DLLB1 Dead Line Live Bus 1 47
DLLB2 Dead Line Live Bus 2 47
DOKA Normal M
IRRORED BITS Communications Channel A status 229
DOKB Normal M
IRRORED BITS Communications Channel B status 230
DOSB Dependable out-of-step blocking asserted 25
DPFA_OK A-Phase displacement power factor OK 27
DPFB_OK B-Phase displacement power factor OK 27
DPFC_OK C-Phase displacement power factor OK 27
DPF3_OK Three-phase displacement power factor OK 27
DST Daylight savings-time 294
DSTP IRIG-B Daylight savings-time pending 294
DSTRT Directional start element picked up 60
DTA Direct transfer trip A-Phase (SEL
OGIC control equation) 57
DTB Direct transfer trip B-Phase (SEL
OGIC control equation) 57
DTC Direct transfer trip C-Phase (SEL
OGIC control equation) 57
DTR Direct transfer trip received 53
E3PT Three-pole trip enable 53
E3PT1 Circuit Breaker 1 three-pole trip enable 53
E3PT2 Circuit Breaker 2 three-pole trip enable 53
EAFSRC Alternate frequency source (SEL
OGIC control equation) 52
ECTT Echo conversion to trip signal 58
ECTTA A-Phase echo conversion to trip signal (ECOMM = POTT3) 62
ECTTB B-Phase echo conversion to trip signal (ECOMM = POTT3) 62
ECTTC C-Phase echo conversion to trip signal (ECOMM = POTT3) 62
EKEY Echo received permissive trip signal 58
EKEYA A-Phase echo received permissive trip signal (ECOMM = POTT3) 62
EKEYB B-Phase echo received permissive trip signal (ECOMM = POTT3) 62
EKEYC C-Phase echo received permissive trip signal (ECOMM = POTT3) 62
EN Relay enabled 0
ENX2AB Enable AB negative-sequence reactance element 398
ENX2BC Enable BC negative-sequence reactance element 398
Table 11.1 Alphabetic List of Relay Word Bits (Sheet 17 of 34)
Name Description Row
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