R.A.23
Date Code 20111215 Reference Manual SEL-421 Relay
Relay Word Bits
Row List
4 M1PT Zone 1 Mho phase distance, time-delayed
4 M2PT Zone 2 Mho phase distance, time-delayed
4 M3PT Zone 3 Mho phase distance, time-delayed
4 M4PT Zone 4 Mho phase distance, time-delayed
4 M5PT Zone 5 Mho phase distance, time-delayed
4* Reserved
4* Reserved
4* Reserved
5 Z1G Zone 1 ground distance element
5 Z2G Zone 2 ground distance element
5 Z3G Zone 3 ground distance element
5 Z4G Zone 4 ground distance element
5 Z5G Zone 5 ground distance element
5* Reserved
5* Reserved
5* Reserved
6 Z1GT Zone 1 ground distance, time-delayed
6 Z2GT Zone 2 ground distance, time-delayed
6 Z3GT Zone 3 ground distance, time-delayed
6 Z4GT Zone 4 ground distance, time-delayed
6 Z5GT Zone 5 ground distance, time-delayed
6* Reserved
6* Reserved
6* Reserved
7 Z1T Zone 1 phase or ground distance, time-delayed
7 Z2T Zone 2 phase or ground distance, time-delayed
7 Z3T Zone 3 phase or ground distance, time-delayed
7 Z4T Zone 4 phase or ground distance, time-delayed
7 Z5T Zone 5 phase or ground distance, time-delayed
7* Reserved
7* Reserved
7* Reserved
8 MAB1 Zone 1 Mho A-B phase element
8 MBC1 Zone 1 Mho B-C phase element
8 MCA1 Zone 1 Mho C-A phase element
8* Reserved
8 MAB2 Zone 2 Mho A-B phase element
8 MBC2 Zone 2 Mho B-C phase element
8 MCA2 Zone 2 Mho C-A phase element
8* Reserved
9 MAB3 Zone 3 Mho A-B phase element
Table A.3 Relay Word Bits: Distance Elements (Sheet 2 of 4)
Row Name Description
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