R.A.12
SEL-421 Relay Reference Manual Date Code 20111215
Relay Word Bits
Alphabetic
LCBF2 Circuit Breaker 2 load current circuit breaker failure 66
LEADBK0 No lead circuit breaker 36
LEADBK1 Lead circuit breaker = Circuit Breaker 1 36
LEADBK2 Lead circuit breaker = Circuit Breaker 2 36
LLDB1 Live Line Dead Bus 1 39
LLDB2 Live Line Dead Bus 2 39
LOADTE Load TECORR Factor (SEL
OGIC Equation). When a rising-
edge is detected (greater than one cycle), the accumulated
time-error value TE is loaded with the TECORR factor
(preload value).
276
LOP Loss-of-potential detected 43
LOPHA Line A-phase open 69
LOPHB Line B-phase open 69
LOPHC Line C-phase open 70
LPSEC Direction of the upcoming leap second. During the time that
LPSECP is asserted, if LPSEC is asserted, the upcoming leap
second is deleted; otherwise, the leap second is added.
274
LPSECP Leap second pending (asserts for up to one minute prior to
leap second, deasserts when the change is to occur, at “00”)
274
M1P Zone 1 Mho phase element 3
M1PT Zone 1 Mho phase distance, time-delayed 4
M2P Zone 2 Mho phase element 3
M2PT Zone 2 Mho phase distance, time-delayed 4
M3P Zone 3 Mho phase element 3
M3PT Zone 3 Mho phase distance, time-delayed 4
M4P Zone 4 Mho phase element 3
M4PT Zone 4 Mho phase distance, time-delayed 4
M5P Zone 5 Mho phase element 3
M5PT Zone 5 Mho phase distance, time-delayed 4
MAB1 Zone 1 Mho A-B phase element 8
MAB1H
a
High-speed Zone 1 Mho A-B phase element 264
MAB2 Zone 2 Mho A-B phase element 8
MAB2H
a
High-speed Zone 2 Mho A-B phase element 264
MAB3 Zone 3 Mho A-B phase element 9
MAB3H
a
High-speed Zone 3 Mho A-B phase element 260
MAB4 Zone 4 Mho A-B phase element 9
MAB5 Zone 5 Mho A-B phase element 10
MAG1 Zone 1 Mho A-phase-to-ground element 10
MAG1H
a
High-speed Zone 1 Mho A-phase-to-ground element 262
MAG2 Zone 2 Mho A-phase-to-ground element 11
MAG2H
a
High-speed Zone 2 Mho A-phase-to-ground element 262
MAG3 Zone 3 Mho A-phase-to-ground element 11
MAG3H
a
High-speed Zone 3 Mho A-phase-to-ground element 262
Table A.1 Alphabetic List of Relay Word Bits (Sheet 12 of 21)
Name Description
Row
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