11.40
SEL-421 Relay Instruction Manual Date Code 20171021
Relay Word Bits
Row Lists
Table 11.7 Relay Word Bits: Overcurrent Elements
Row Name Description
31 50P1–50P4 Level 1–4 phase overcurrent element
31 67P1–67P4 Level 1–4 phase directional overcurrent element
32 67P1T–67P4T Level 1–4 phase-delayed directional overcurrent element
32 50G1–50G4 Level 1–4 residual overcurrent element
33 67G1–67G4 Level 1–4 residual directional overcurrent element
33 67G1T–67G4T Level 1–4 residual delayed directional overcurrent element
34 50Q1–50Q4 Level 1–4 negative-sequence overcurrent element
34 67Q1–67Q4 Level 1–4 negative-sequence directional overcurrent element
35 67Q1T–67Q4T Level 1–4 negative-sequence delayed directional overcurrent element
35 * Reserved
35 * Reserved
35 * Reserved
35 * Reserved
36 51S1 Inverse-time Overcurrent Element 1 pickup
36 51S1T Inverse-time Overcurrent Element 1 timed out
36 51S1R Inverse-time Overcurrent Element 1 reset
36 * Reserved
36 51S2 Inverse-time Overcurrent Element 2 pickup
36 51S2T Inverse-time Overcurrent Element 2 timed out
36 51S2R Inverse-time Overcurrent Element 2 reset
36 * Reserved
37 51S3 Inverse-time Overcurrent Element 3 pickup
37 51S3T Inverse-time Overcurrent Element 3 timed out
37 51S3R Inverse-time Overcurrent Element 3 reset
37 * Reserved
37 * Reserved
37 * Reserved
37 * Reserved
37 * Reserved
Table 11.8 Relay Word Bits: Synchronism-Check Elements (Sheet 1 of 2)
Row Name Description
38 59VP VP within “healthy voltage” window
38 59VS1 VS1 within “healthy voltage” window
38 25ENBK1 Circuit Breaker 1 synchronism-check element enable
38 SFZBK1 Circuit Breaker 1 slip frequency less than 5 mHz
38 SFBK1 5 mHz Circuit Breaker 1 slip frequency < 25 SFBK1
38 25W1BK1 Circuit Breaker 1 Angle 1 within Window 1
38 25W2BK1 Circuit Breaker 1 Angle 2 within Window 2
38 25A1BK1 Circuit Breaker 1 voltages within Synchronism Angle 1
39 25A2BK1 Circuit Breaker 1 voltages within Synchronism Angle 2
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