R.A.3
Date Code 20111215 Reference Manual SEL-421 Relay
Relay Word Bits
Alphabetic
50FOC2 Circuit Breaker 2 C-phase flashover current threshold
exceeded
67
50G1 Level 1 residual overcurrent element 24
50G2 Level 2 residual overcurrent element 24
50G3 Level 3 residual overcurrent element 24
50G4 Level 4 residual overcurrent element 24
50GF Forward zero-sequence supervisory current element 21
50GR Reverse zero-sequence supervisory current element 21
50LCA1 Circuit Breaker 1 A-phase load current threshold exceeded 60
50LCA2 Circuit Breaker 2 A-phase load current threshold exceeded 66
50LCB1 Circuit Breaker 1 B-phase load current threshold exceeded 60
50LCB2 Circuit Breaker 2 B-phase load current threshold exceeded 66
50LCC1 Circuit Breaker 1 C-phase load current threshold exceeded 60
50LCC2 Circuit Breaker 2 C-phase load current threshold exceeded 66
50P1 Level 1 phase overcurrent element 23
50P2 Level 2 phase overcurrent element 23
50P3 Level 3 phase overcurrent element 23
50P4 Level 4 phase overcurrent element 23
50Q1 Level 1 negative-sequence overcurrent element 26
50Q2 Level 2 negative-sequence overcurrent element 26
50Q3 Level 3 negative-sequence overcurrent element 26
50Q4 Level 4 negative-sequence overcurrent element 26
50QF Forward negative-sequence supervisory current element 21
50QR Reverse negative-sequence supervisory current element 21
50R1 Circuit Breaker 1 residual current threshold exceeded 60
50R2 Circuit Breaker 2 residual current threshold exceeded 66
51S1 Inverse-Time Overcurrent Element 1 pickup 28
51S1R Inverse-Time Overcurrent Element 1 reset 28
51S1T Inverse-Time Overcurrent Element 1 timed out 28
51S2 Inverse-Time Overcurrent Element 2 pickup 28
51S2R Inverse-Time Overcurrent Element 2 reset 28
51S2T Inverse-Time Overcurrent Element 2 timed out 28
51S3 Inverse-Time Overcurrent Element 3 pickup 29
51S3R Inverse-Time Overcurrent Element 3 reset 29
51S3T Inverse-Time Overcurrent Element 3 timed out 29
52AA1 Circuit Breaker 1, Pole A status 72
52AA2 Circuit Breaker 2, Pole A status 74
52AAL1 Circuit Breaker 1, Pole A alarm 72
52AAL2 Circuit Breaker 2, Pole A alarm 73
52AB1 Circuit Breaker 1, Pole B status 72
52AB2 Circuit Breaker 2, Pole B status 74
Table A.1 Alphabetic List of Relay Word Bits (Sheet 3 of 21)
Name Description
Row
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