11.34
SEL-421 Relay Instruction Manual Date Code 20171021
Relay Word Bits
Row Lists
Row Lists
Z3PT Zone 3 phase-distance, time-delayed 4
Z3RB Current reversal guard asserted 58
Z3RBA A-Phase current reversal guard asserted (ECOMM = POTT3) 61
Z3RBB B-Phase current reversal guard asserted (ECOMM = POTT3) 61
Z3RBC C-Phase current reversal guard asserted (ECOMM = POTT3) 61
Z3T Zone 3 phase- or ground-distance, time-delayed 7
Z3XT Current reversal guard timer picked up 60
Z4G Zone 4 ground-distance element 5
Z4GT Zone 4 ground-distance, time-delayed 6
Z4P Zone 4 phase-distance element 3
Z4PT Zone 4 phase-distance, time-delayed 4
Z4T Zone 4 phase or ground-distance, time-delayed 7
Z5G Zone 5 ground-distance element 5
Z5GT Zone 5 ground-distance, time-delayed 6
Z5P Zone 5 phase-distance element 3
Z5PT Zone 5 phase-distance, time-delayed 4
Z5T Zone 5 phase or ground-distance, time-delayed 7
ZLIN Load-encroachment load-in element 51
ZLOAD ZLOUT or ZLIN element picked up 51
ZLOUT Load-encroachment load-out element 51
Table 11.2 Relay Word Bits: Enable and Tripping Bits
Row Name Description
0 EN Relay enabled
0 TRIPLED Trip LED
0* Reserved
0* Reserved
0* Reserved
0* Reserved
0* Reserved
0* Reserved
1 TLED_1–TLED_8 Target LED 1–Target LED 8
2 TLED_9–TLED_16 Target LED 9–Target LED 16
Table 11.3 Relay Word Bits: Distance Elements (Sheet 1 of 4)
Row Name Description
3 Z1P–Z5P Zone 1–Zone 5 phase-distance element
3* Reserved
Table 11.1 Alphabetic List of Relay Word Bits (Sheet 34 of 34)
Name Description Row
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