11.29
Date Code 20171021 Instruction Manual SEL-421 Relay
Relay Word Bits
Alphabetical List
SPSHOT2 Single-pole shot counter = 2 49
SPT Single-pole trip 55
SSD Out-of-step swing signature detected 25
STALLTE Stall time-error calculation (SEL
OGIC Equation). When asserted, the time-error calculation is stalled, or
frozen.
296
STOP Stop element picked up 60
TBBK Time between circuit breakers timing 50
TBNC Time is based on a valid BNC IRIG-B source 211
TESTDB Communications card database Test Bit 231
TESTDB2 Communications card database Test Bit 2 231
TESTFM Fast meter test bit 231
TESTPUL Pulse test bit 231
TGLOBAL Relay calendar clock and ADC sampling synchronized to C37.118 high-accuracy IRIG-B time source 210
TIRIG Assert while time is based on IRIG for both mark and value 209
TLED_1–TLED_8 Target LED 1–8 1
TLED_9–TLED_16 Target LED 9–16 2
TLED_17–TLED_24 Target LED 17–24 300
TMB1A–TMB8A Channel A transmit M
IRRORED BITS 1–8 226
TMB1B–TMB8B Channel B transmit M
IRRORED BITS 1–8 228
TOP Trip during open pole timer is asserted 56
TPA Trip A 55
TPA1 Circuit Breaker 1 Trip A 55
TPA2 Circuit Breaker 2 Trip A 56
TPB Trip B 55
TPB1 Circuit Breaker 1 Trip B 55
TPB2 Circuit Breaker 2 Trip B 56
TPC Trip C 55
TPC1 Circuit Breaker 1 Trip C 56
TPC2 Circuit Breaker 2 Trip C 56
TPLLEXT Update PLL using external signal 210
TPTP Time is based on a valid PTP source 211
TQUAL1 Time quality, binary, add 1 when asserted 294
TQUAL2 Time quality, binary, add 2 when asserted 294
TQUAL4 Time quality, binary, add 4 when asserted 294
TQUAL8 Time quality, binary, add 8 when asserted 294
TREA1–TREA4 Trigger Reason Bit 1–4 (SEL
OGIC Equation) 288
TRGTR Reset all active target relay words 224
TRIP Trip A or Trip B or Trip C 55
TRIPLED Trip LED 0
TRPRM Trip permission 53
TSER Time is based on a valid Serial IRIG-B source 211
Table 11.1 Alphabetic List of Relay Word Bits (Sheet 29 of 34)
Name Description Row
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