R.A.20
SEL-421 Relay Reference Manual Date Code 20111215
Relay Word Bits
Alphabetic
TUTCH Offset half-hour from UTC time, binary, add 0.5 if asserted 273
TUTCS Offset hours sign from UTC time, subtract the UTC offset if
TUTCS is asserted, add otherwise
273
UBB Block permissive trip received 1 or 2 51
UBB1 Blocks permissive trip Receiver 1 51
UBB2 Blocks permissive trip Receiver 2 51
UBOSB Unblock out-of-step blocking 17
ULCL1 Unlatch closing for Circuit Breaker 1 (SEL
OGIC control
equation)
38
ULCL2 Unlatch closing for Circuit Breaker 2 (SEL
OGIC control
equation)
38
ULMTR1 Circuit Breaker 1 unlatch manual trip 48
ULMTR2 Circuit Breaker 2 unlatch manual trip 48
ULTR Unlatch all protection trips 48
ULTRA Unlatch Trip A 49
ULTRB Unlatch Trip B 49
ULTRC Unlatch Trip C 49
VPOLV Polarizing voltage valid 15
WFC Weak infeed condition detected 51
X6ABC Impedance inside Zone 6 out-of-step 17
X7ABC Impedance inside Zone 7 out-of-step 17
XAG1 Zone 1 quad A phase to-ground element 13
XAG2 Zone 2 quad A-phase-to-ground element 13
XAG3 Zone 3 quad A-phase-to-ground element 14
XAG4 Zone 4 quad A-phase-to-ground element 14
XAG5 Zone 5 quad A-phase-to-ground element 15
XBG1 Zone 1 quad B-phase-to-ground element 13
XBG2 Zone 2 quad B-phase-to-ground element 13
XBG3 Zone 3 quad B-phase-to-ground element 14
XBG4 Zone 4 quad B-phase-to-ground element 14
XBG5 Zone 5 quad B-phase-to-ground element 15
XCG1 Zone 1 quad C-phase-to-ground element 13
XCG2 Zone 2 quad C-phase-to-ground element 13
XCG3 Zone 3 quad C-phase-to-ground element 14
XCG4 Zone 4 quad C-phase-to-ground element 14
XCG5 Zone 5 quad C-phase-to-ground element 15
YEAR1 IRIG-B year information, binary-coded-decimal, add 1 if
asserted
c
272
YEAR10 IRIG-B year information, binary-coded-decimal, add 10 if
asserted
c
272
YEAR2 IRIG-B year information, binary-coded-decimal, add 2 if
asserted
c
272
Table A.1 Alphabetic List of Relay Word Bits (Sheet 20 of 21)
Name Description
Row
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