R.A.21
Date Code 20111215 Reference Manual SEL-421 Relay
Relay Word Bits
Alphabetic
YEAR20 IRIG-B year information, binary-coded-decimal, add 20 if
asserted
c
272
YEAR4 IRIG-B year information, binary-coded-decimal, add 4 if
asserted
c
272
YEAR40 IRIG-B year information, binary-coded-decimal, add 40 if
asserted
c
272
YEAR8 IRIG-B year information, binary-coded-decimal, add 8 if
asserted
c
272
YEAR80 IRIG-B year information, binary-coded-decimal, add 80 if
asserted
c
272
Z1G Zone 1 ground distance element 5
Z1GT Zone 1 ground distance, time-delayed 6
Z1T Zone 1 phase or ground distance, time-delayed 7
Z2G Zone 2 ground distance element 5
Z2GT Zone 2 ground distance, time-delayed 6
Z2PGS Zone 2 phase and ground short delay element 52
Z2T Zone 2 phase or ground distance, time-delayed 7
Z3G Zone 3 ground distance element 5
Z3GT Zone 3 ground distance, time-delayed 6
Z3RB Current reversal guard asserted 50
Z3RBA A-Phase Current Reversal Guard asserted
(ECOMM=POTT3)
53
Z3RBB B-Phase Current Reversal Guard asserted
(ECOMM=POTT3)
53
Z3RBC C-Phase Current Reversal Guard asserted
(ECOMM=POTT3)
53
Z3T Zone 3 phase or ground distance, time-delayed 7
Z3XT Current reversal guard timer picked up 52
Z4G Zone 4 ground distance element 5
Z4GT Zone 4 ground distance, time-delayed 6
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
Z5T Zone 5 phase or ground distance, time-delayed 7
ZLIN Load-encroachment “load out” element 43
ZLOAD ZLOUT or ZLIN element picked up 43
ZLOUT Load-encroachment “load in” element 43
a
Not in SEL-421-1 nor SEL-421-2.
b
See IRIG-B on page U.4.71.
c
The SEL-421 uses the year information obtained from IRIG-B to set the internal clock year
value if EPMU := Y.
Table A.1 Alphabetic List of Relay Word Bits (Sheet 21 of 21)
Name Description
Row
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