R.A.34
SEL-421 Relay Reference Manual Date Code 20111215
Relay Word Bits
Row List
54 ECTTB B-phase echo conversion to trip signal
(ECOMM=POTT3)
54 ECTTC C-phase echo conversion to trip signal
(ECOMM=POTT3)
54 * Reserved
54 * Reserved
55 PTA A-phase permissive trip received (ECOMM=POTT3)
55 PTB B-phase permissive trip received (ECOMM=POTT3)
55 PTC C-phase permissive trip received (ECOMM=POTT3)
55 * Reserved
55 * Reserved
55 * Reserved
55 * Reserved
55 * Reserved
56 * Reserved
56 * Reserved
56 * Reserved
56 * Reserved
56 * Reserved
56 * Reserved
56 * Reserved
56 * Reserved
Table A.13 Relay Word Bits: Circuit Breaker 1 Failure (Sheet 1 of 2)
Row Name Description
57 BFI3P1 Circuit Breaker 1 three-pole circuit breaker failure
initiation
57 BFIA1 Circuit Breaker 1 A-phase circuit breaker failure initiation
57 BFIB1 Circuit Breaker 1 B-phase circuit breaker failure initiation
57 BFIC1 Circuit Breaker 1 C-phase circuit breaker failure initiation
57 BFI3PT1 Circuit Breaker 1 extended three-pole extended circuit
breaker failure initiation
57 BFIAT1 Circuit Breaker 1 A-phase extended circuit breaker failure
initiation
57 BFIBT1 Circuit Breaker 1 B-phase extended circuit breaker failure
initiation
57 BFICT1 Circuit Breaker 1 C-phase extended circuit breaker failure
initiation
58 50FA1 Circuit Breaker 1 A-phase current threshold exceeded
58 50FB1 Circuit Breaker 1 B-phase current threshold exceeded
58 50FC1 Circuit Breaker 1 C-phase current threshold exceeded
58 RT3P1 Circuit Breaker 1 three-pole retrip
58 RTA1 Circuit Breaker 1 A-phase retrip
Table A.12 Relay Word Bits: Pilot Tripping Elements (Sheet 2 of 2)
Row Name Description
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