11.3
Date Code 20171021 Instruction Manual SEL-421 Relay
Relay Word Bits
Alphabetical List
50ABC Positive-sequence current above 50ABCP threshold 21
50FA1 Circuit Breaker 1 A-Phase current threshold exceeded 66
50FA2 Circuit Breaker 2 A-Phase current threshold exceeded 72
50FB1 Circuit Breaker 1 B-Phase current threshold exceeded 66
50FB2 Circuit Breaker 2 B-Phase current threshold exceeded 72
50FC1 Circuit Breaker 1 C-Phase current threshold exceeded 66
50FC2 Circuit Breaker 2 C-Phase current threshold exceeded 72
50FOA1 Circuit Breaker 1 A-Phase flashover current threshold exceeded 69
50FOA2 Circuit Breaker 2 A-Phase flashover current threshold exceeded 75
50FOB1 Circuit Breaker 1 B-Phase flashover current threshold exceeded 69
50FOB2 Circuit Breaker 2 B-Phase flashover current threshold exceeded 75
50FOC1 Circuit Breaker 1 C-Phase flashover current threshold exceeded 69
50FOC2 Circuit Breaker 2 C-Phase flashover current threshold exceeded 75
50G1–50G4 Level 1–4 residual overcurrent element 32
50GF Forward zero-sequence supervisory current element 29
50GR Reverse zero-sequence supervisory current element 29
50LCA1 Circuit Breaker 1 A-Phase load current threshold exceeded 68
50LCA2 Circuit Breaker 2 A-Phase load current threshold exceeded 74
50LCB1 Circuit Breaker 1 B-Phase load current threshold exceeded 68
50LCB2 Circuit Breaker 2 B-Phase load current threshold exceeded 74
50LCC1 Circuit Breaker 1 C-Phase load current threshold exceeded 68
50LCC2 Circuit Breaker 2 C-Phase load current threshold exceeded 74
50P1–50P4 Level 1–4 phase overcurrent element 31
50Q1–50Q4 Level 1–4 negative-sequence overcurrent element 34
50QF Forward negative-sequence supervisory current element 29
50QR Reverse negative-sequence supervisory current element 29
50R1 Circuit Breaker 1 residual current threshold exceeded 68
50R2 Circuit Breaker 2 residual current threshold exceeded 74
51S1 Inverse-time Overcurrent Element 1 pickup 36
51S1R Inverse-time Overcurrent Element 1 reset 36
51S1T Inverse-time Overcurrent Element 1 timed out 36
51S2 Inverse-time Overcurrent Element 2 pickup 36
51S2R Inverse-time Overcurrent Element 2 reset 36
51S2T Inverse-time Overcurrent Element 2 timed out 36
51S3 Inverse-time Overcurrent Element 3 pickup 37
51S3R Inverse-time Overcurrent Element 3 reset 37
51S3T Inverse-time Overcurrent Element 3 timed out 37
521_ALM Breaker 1 status alarm 365
521CLSM Breaker 1 closed 365
522_ALM Breaker 2 status alarm 365
522CLSM Breaker 2 closed 365
Table 11.1 Alphabetic List of Relay Word Bits (Sheet 3 of 34)
Name Description Row
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