R.A.9
Date Code 20111215 Reference Manual SEL-421 Relay
Relay Word Bits
Alphabetic
DC1G DC Monitor 1 ground fault alarm 85
DC1R DC Monitor 1 alarm for ac ripple 85
DC1W DC Monitor 1 warning alarm 85
DC2F DC Monitor 2 fail alarm 85
DC2G DC Monitor 2 ground fault alarm 85
DC2R DC Monitor 2 alarm for ac ripple 85
DC2W DC Monitor 2 warning alarm 85
DELAY Local current and voltage source delay logic 261
DFAULT Disables maximum/minimum metering and demand
metering when SEL
OGIC control equation FAULT asserts
44
DLDB1 Dead Line Dead Bus 1 39
DLDB2 Dead Line Dead Bus 2 39
DLLB1 Dead Line Live Bus 1 39
DLLB2 Dead Line Live Bus 2 39
DOKA Normal M
IRRORED BITS communications Channel A status 233
DOKB Normal M
IRRORED BITS communications Channel B status 234
DST Daylight Savings Time 274
DSTP Daylight Savings Time Pending 274
DSTRT Directional start element picked up 52
DTA Direct transfer trip A-Phase (SEL
OGIC control equation) 49
DTB Direct transfer trip B-Phase (SEL
OGIC control equation) 49
DTC Direct transfer trip C-Phase (SEL
OGIC control equation) 49
DTR Direct transfer trip received 45
E3PT Three-pole trip enable 45
E3PT1 Circuit Breaker 1 three-pole trip enable 45
E3PT2 Circuit Breaker 2 three-pole trip enable 45
EAFSRC Alternate frequency source (SEL
OGIC control equation) 44
ECTT Echo conversion to trip signal 50
ECTTA A-phase echo conversion to trip signal (ECOMM=POTT3) 54
ECTTB B-phase echo conversion to trip signal (ECOMM=POTT3) 54
ECTTC C-phase echo conversion to trip signal (ECOMM=POTT3) 54
EKEY Echo received permissive trip signal 50
EKEYA A-phase echo received permissive trip signal
(ECOMM=POTT3)
54
EKEYB B-phase echo received permissive trip signal
(ECOMM=POTT3)
54
EKEYC C-phase echo received permissive trip signal
(ECOMM=POTT3)
54
EN Relay Enabled 0
ER Event report trigger equation (SEL
OGIC control equation) 44
EVELOCK Lock DNP Events 270
F32I Forward current polarized zero-sequence directional element 22
Table A.1 Alphabetic List of Relay Word Bits (Sheet 9 of 21)
Name Description
Row
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