11.27
Date Code 20171021 Instruction Manual SEL-421 Relay
Relay Word Bits
Alphabetical List
RT3P1 Circuit Breaker 1 three-pole retrip 66
RT3P2 Circuit Breaker 2 three-pole retrip 72
RTA1 Circuit Breaker 1 A-Phase retrip 66
RTA2 Circuit Breaker 2 A-Phase retrip 72
RTB1 Circuit Breaker 1 B-Phase retrip 66
RTB2 Circuit Breaker 2 B-Phase retrip 72
RTC1 Circuit Breaker 1 C-Phase retrip 66
RTC2 Circuit Breaker 2 C-Phase retrip 72
RTCAD01–RTCAD08 RTC remote data bits, Channel A, Bit 1–8 312
RTCAD09–RTCAD16 RTC remote data bits, Channel A, Bit 9–16 313
RTCBD01–RTCBD08 RTC remote data bits, Channel B, Bit 1–8 314
RTCBD09–RTCBD16 RTC remote data bits, Channel B, Bit 9–16 315
RTCCFGA RTC data in sequence, Channel A 290
RTCCFGB RTC data in sequence, Channel B 290
RTCDLYA RTC delay exceeded, Channel A 291
RTCDLYB RTC delay exceeded, Channel B 291
RTCENA Valid remote synchrophasors received on Channel A 291
RTCENB Valid remote synchrophasors received on Channel B 291
RTCROK Valid aligned RTC data available on all enabled channels 291
RTCROKA Valid aligned RTC data available on Channel A 291
RTCROKB Valid aligned RTC data available on Channel B 291
RTCSEQA RTC configuration complete, Channel A 290
RTCSEQB RTC configuration complete, Channel B 290
RTD01ST–RTD08ST RTD status for Channel 1–8 87
RTD09ST–RTD12ST RTD status for Channel 9–12 88
RTDCOMF RTD communication failure 88
RTDFL RTD device failure 88
RTDIN State of RTD contact input 88
RTS3P1 Circuit Breaker 1 current-supervised three-pole retrip 66
RTS3P2 Circuit Breaker 2 current-supervised three-pole retrip 72
RTSA1 Circuit Breaker 1 current-supervised A-Phase retrip 67
RTSA2 Circuit Breaker 2 current-supervised A-Phase retrip 73
RTSB1 Circuit Breaker 1 current-supervised B-Phase retrip 67
RTSB2 Circuit Breaker 2 current-supervised B-Phase retrip 73
RTSC1 Circuit Breaker 1 current-supervised C-Phase retrip 67
RTSC2 Circuit Breaker 2 current-supervised C-Phase retrip 73
RXPRM Receiver trip permission 53
SALARM Software alarm 206
SD Swing center voltage slope detected 25
SER_BNP Bad jitter on serial port and the IRIG-B signal is lost afterwards 213
SER_OK IRIG-B signal from serial Port 1 is available and has sufficient quality 212
Table 11.1 Alphabetic List of Relay Word Bits (Sheet 27 of 34)
Name Description Row
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