R.A.13
Date Code 20111215 Reference Manual SEL-421 Relay
Relay Word Bits
Alphabetic
MAG4 Zone 4 Mho A-phase-to-ground element 12
MAG5 Zone 5 Mho A-phase-to-ground element 12
MATHERR SEL
OGIC control equation math error 194
MBC1 Zone 1 Mho B-C phase element 8
MBC1H
a
High-speed Zone 1 Mho B-C phase element 264
MBC2 Zone 2 Mho B-C phase element 8
MBC2H
a
High-speed Zone 2 Mho B-C phase element 264
MBC3 Zone 3 Mho B-C phase element 9
MBC3H
a
High-speed Zone 3 Mho B-C phase element 264
MBC4 Zone 4 Mho B-C phase element 9
MBC5 Zone 5 Mho B-C phase element 10
MBG1 Zone 1 Mho B-phase-to-ground element 10
MBG1H
a
High-speed Zone 1 Mho B-phase-to-ground element 262
MBG2 Zone 2 Mho B-phase-to-ground element 11
MBG2H
a
High-speed Zone 2 Mho B-phase-to-ground element 262
MBG3 Zone 3 Mho B-phase-to-ground element 11
MBG3H
a
High-speed Zone 3 Mho B-phase-to-ground element 262
MBG4 Zone 4 Mho B-phase-to-ground element 12
MBG5 Zone 5 Mho B-phase-to-ground element 12
MCA1 Zone 1 Mho C-A phase element 8
MCA1H
a
High-speed Zone 1 Mho C-A phase element 264
MCA2 Zone 2 Mho C-A phase element 8
MCA2H
a
High-speed Zone 2 Mho C-A phase element 264
MCA3 Zone 3 Mho C-A phase element 9
MCA3H
a
High-speed Zone 3 Mho C-A phase element 265
MCA4 Zone 4 Mho C-A phase element 9
MCA5 Zone 5 Mho C-A phase element 10
MCG1 Zone 1 Mho C-phase-to-ground element 10
MCG1H
a
High-speed Zone 1 Mho C-phase-to-ground element 262
MCG2 Zone 2 Mho C-phase-to-ground element 11
MCG2H
a
High-speed Zone 2 Mho C-phase-to-ground element 262
MCG3 Zone 3 Mho C-phase-to-ground element 11
MCG3H
a
High-speed Zone 3 Mho C-phase-to-ground element 263
MCG4 Zone 4 Mho C-phase-to-ground element 12
MCG5 Zone 5 Mho C-phase-to-ground element 12
NBF1 Circuit Breaker 1 no current circuit breaker failure 60
NBF2 Circuit Breaker 2 no current circuit breaker failure 66
NBK0 No circuit breakers active in reclose scheme 37
NBK1 One circuit breaker active in reclose scheme 37
NBK2 Two circuit breakers active in reclose scheme 37
NSTRT Non-directional start element picked up 52
Table A.1 Alphabetic List of Relay Word Bits (Sheet 13 of 21)
Name Description
Row
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