R.A.18
SEL-421 Relay Reference Manual Date Code 20111215
Relay Word Bits
Alphabetic
SERCCA
a
Series-compensated line CA-phase output 16
SFBK1 5 mHz Circuit Breaker 1 slip frequency < 25 SFBK1 30
SFBK2 5 mHz Circuit Breaker 2 slip frequency < 25 SFBK2 32
SFZBK1 Circuit Breaker 1 slip frequency less than 5 mHz 30
SFZBK2 Circuit Breaker 2 slip frequency less than 5 mHz 32
SG1 Settings Group 1 active 96
SG2 Settings Group 2 active 96
SG3 Settings Group 3 active 96
SG4 Settings Group 4 active 96
SG5 Settings Group 5 active 96
SG6 Settings Group 6 active 96
SLOW1 fs1 < fp 31
SLOW2 fs2 < fp 33
SOTFE Switch-onto-fault enable 43
SOTFT Switch-onto-fault trip 45
SP1CLS Single-pole Circuit Breaker 1 reclose supervision (SEL
OGIC
control equation)
37
SP2CLS Single-pole Circuit Breaker 2 reclose supervision (SEL
OGIC
control equation)
37
SPARC Single-pole reclose initiate qualified 34
SPLSHT Single-pole reclose last shot 34
SPO One or two poles open 70
SPOA A-phase open 70
SPOB B-phase open 70
SPOBK1 Single-pole open Circuit Breaker 1 34
SPOBK2 Single-pole open Circuit Breaker 2 34
SPOC C-phase open 70
SPOI Single-pole open interval timing 42
SPOISC Single-pole open interval supervision condition 42
SPRCIP Single-pole reclaim in progress 40
SPRI Single-pole reclose initiation (SEL
OGIC control equation) 34
SPSHOT0 Single-pole shot counter =0 41
SPSHOT1 Single-pole shot counter =1 41
SPSHOT2 Single-pole shot counter =2 41
SPT Single-pole trip 47
STALLTE Stall Time-Error Calculation (SEL
OGIC Equation). When
asserted, the time-error calculation is stalled, or frozen.
272
STOP Stop element picked up 52
TBBK Time between circuit breakers timing 42
TESTDB Communications card database test bit 235
TESTDNP DNP test bit 235
TESTFM Fast meter test bit 235
Table A.1 Alphabetic List of Relay Word Bits (Sheet 18 of 21)
Name Description
Row
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