11.28
SEL-421 Relay Instruction Manual Date Code 20171021
Relay Word Bits
Alphabetical List
SER_RST Disqualify serial IRIG-B high-accuracy time source 212
SER_SET Qualify serial IRIG-B high-accuracy time source 212
SER_TIM A valid IRIG-B time source is detected on serial port 213
SERCA Series-compensated line A-Phase output 20
SERCAB Series-compensated line AB-Phase output 20
SERCB Series-compensated line B-Phase output 20
SERCBC Series-compensated line BC-Phase output 20
SERCC Series-compensated line C-Phase output 20
SERCCA Series-compensated line CA-Phase output 20
SERSYNC Synchronized to a high quality serial IRIG source 213
SETCHG Pulsed alarm for settings changes 206
SFBK1 5 mHz Circuit Breaker 1 slip frequency < 25SFBK1 38
SFBK2 5 mHz Circuit Breaker 2 slip frequency < 25SFBK2 40
SFZBK1 Circuit Breaker 1 slip frequency less than 5 mHz 38
SFZBK2 Circuit Breaker 2 slip frequency less than 5 mHz 40
SG1–SG6 Settings Group 1–6 active 100
SLOW1 fs1 < fp 39
SLOW2 fs2 < fp 41
SOTFE Switch-onto-fault enable 51
SOTFT Switch-onto-fault trip 53
SP1CLS Single-pole Circuit Breaker 1 reclose supervision (SEL
OGIC control equation) 45
SP2CLS Single-pole Circuit Breaker 2 reclose supervision (SEL
OGIC control equation) 45
SPARC Single-pole reclose initiate qualified 42
SPCER1 Synchrophasor configuration error on Port 1 298
SPCER2 Synchrophasor configuration error on Port 2 298
SPCER3 Synchrophasor configuration error on Port 3 298
SPCERF Synchrophasor configuration error on Port F 298
SPEN Signal profiling enabled 267
SPLSHT Single-pole reclose last shot 42
SPO One or two poles open 78
SPOA A-Phase open 78
SPOB B-Phase open 78
SPOBK1 Single-pole open Circuit Breaker 1 42
SPOBK2 Single-pole open Circuit Breaker 2 42
SPOC C-Phase open 78
SPOI Single-pole open interval timing 50
SPOISC Single-pole open interval supervision condition 50
SPRCIP Single-pole reclaim in progress 48
SPRI Single-pole reclose initiation (SEL
OGIC control equation) 42
SPSHOT0 Single-pole shot counter = 0 49
SPSHOT1 Single-pole shot counter = 1 49
Table 11.1 Alphabetic List of Relay Word Bits (Sheet 28 of 34)
Name Description Row
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