R.A.4
SEL-421 Relay Reference Manual Date Code 20111215
Relay Word Bits
Alphabetic
52AC1 Circuit Breaker 1, Pole C status 73
52AC2 Circuit Breaker 2, Pole C status 74
52ACL1 Circuit Breaker 1, Pole A closed 72
52ACL2 Circuit Breaker 2, Pole A closed 73
52BAL1 Circuit Breaker 1, Pole B alarm 72
52BAL2 Circuit Breaker 2, Pole B alarm 73
52BCL1 Circuit Breaker 1, Pole B closed 72
52BCL2 Circuit Breaker 2, Pole B closed 73
52CAL1 Circuit Breaker 1, Pole C alarm 72
52CAL2 Circuit Breaker 2, Pole C alarm 73
52CCL1 Circuit Breaker 1, Pole C closed 72
52CCL2 Circuit Breaker 2, Pole C closed 73
59VP VP within “healthy voltage” window 30
59VS1 VS1 within “healthy voltage” window 30
59VS2 VS2 within “healthy voltage” window 32
67G1 Level 1 residual directional overcurrent element 25
67G1T Level 1 residual delayed directional overcurrent element 25
67G2 Level 2 residual directional overcurrent element 25
67G2T Level 2 residual delayed directional overcurrent element 25
67G3 Level 3 residual directional overcurrent element 25
67G3T Level 3 residual delayed directional overcurrent element 25
67G4 Level 4 residual directional overcurrent element 25
67G4T Level 4 residual delayed directional overcurrent element 25
67P1 Level 1 phase directional overcurrent element 23
67P1T Level 1 phase-delayed directional overcurrent element 24
67P2 Level 2 phase directional overcurrent element 23
67P2T Level 2 phase-delayed directional overcurrent element 24
67P3 Level 3 phase directional overcurrent element 23
67P3T Level 3 phase-delayed directional overcurrent element 24
67P4 Level 4 phase directional overcurrent element 23
67P4T Level 4 phase-delayed directional overcurrent element 24
67Q1 Level 1 negative-sequence directional overcurrent element 26
67Q1T Level 1 negative sequence delayed directional overcurrent
element
27
67Q2 Level 2 negative-sequence directional overcurrent element 26
67Q2T Level 2 negative-sequence delayed directional overcurrent
element
27
67Q3 Level 3 negative-sequence directional overcurrent element 26
67Q3T Level 3 negative-sequence delayed directional overcurrent
element
27
67Q4 Level 4 negative-sequence directional overcurrent element 26
Table A.1 Alphabetic List of Relay Word Bits (Sheet 4 of 21)
Name Description
Row
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