K.22
SEL-751 Relay Instruction Manual Date Code 20170927
Relay Word Bits
Definitions
TSOK Assert if current time source accuracy is sufficient for synchronized phasor measurements
13
TUTC1 Offset hours from UTC time, binary, add 1 if asserted
117
TUTC2 Offset hours from UTC time, binary, add 2 if asserted
117
TUTC4 Offset hours from UTC time, binary, add 4 if asserted
117
TUTC8 Offset hours from UTC time, binary, add 8 if asserted
117
TUTCH Offset half-hour from UTC time, binary, add 0.5 if asserted
117
TUTCS Offset hours sign from UTC time, subtract the UTC offset if TUTCS is asserted; otherwise,
add
117
UGFWD Zero-sequence voltage-polarized forward direction detected ungrounded/high Z control U
151
UGREV Zero-sequence voltage-polarized reverse direction detected ungrounded/high Z control U
151
ULCL Unlatch Close SEL
OGIC control equation state
38
ULTRIP Unlatch Trip SELOGIC control equation state
33
VBxxx Virtual bits used for incoming GOOSE messages (xxx = 1–128)
97–112
VPOLV Positive-sequence polarization voltage valid
131
WARNING Warning bit asserts for possible warning conditions as shown in Tab le 8.3. These conditions
also trigger a flashing TRIP LED.
13
WDGALRM Winding temperature alarm WDGALRM asserts when any healthy winding RTD temperature
exceeds its alarm set point
25
WDGTRIP Winding temperature trip WDGTRIP asserts when one or two (when EWDGV = Y) healthy
winding RTD temperatures exceed their trip set points
25
ZLIN Load encroachment “load in” element
131
ZLOAD Load encroachment element pickup
131
ZLOUT Load encroachment “load out” element
131
Table K.2 Relay Word Bit Definitions for the SEL-751 Relay (Sheet 17 of 17)
Bit Definition Row
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