8-28
Application
BE1-951
Table 8-16. FDR-W-IL Virtual Output Logic
Output
Purpose
Output Description
Variable
Label
State Labels
TRUE (1)
FALSE (0)
VOA
(OUTA)
Alarm Output Contact
Alarm contact closes automatically
when relay trouble alarm occurs.
ALARM
ACTIVE
NORMAL
BESTlogic Expression: VOA = 0
VO1
(OUT1)
Breaker Trip Contact
Trip breaker when protective trip
expression is TRUE or when
breaker failure is initiated or when
virtual breaker control switch is
operated to trip.
BKR_TRIP
TRIP
NORMAL
BESTlogic Expression: VO1 = VO11+BFPU+101C
VO2
(OUT2)
Breaker Close
Contact
Close breaker when recloser close
output is TRUE or when virtual
breaker control switch is operated
to close.
BKR_CLOSE
CLOSE
NORMAL
BESTlogic Expression: VO2 = 79C+101C
VO3
(OUT3)
Relay Backup Enable
Output is held closed when relay is
in service but is in Test mode or in
Relay Failure mode.
IN_SERVICE
NORMAL
BACKUP
BESTlogic Expression: VO3 = /VO15
VO4
(OUT4)
Block Upstream
Instantaneous
Elements
Upstream instantaneous elemenst
are blocked when relay is picked up
for high speed bus overcurrent
protection. Blocks upstream
instantaneous elements when the
protective pickup expression is
TRUE, the relay is not in Test
mode, and the breaker has not
failed.
BLK_UPSTRM
BLOCKE
D
NORMAL
BESTlogic Expression: VO4 = VO12*/VO5*/VO15
VO5
(OUT5)
Breaker Failure Trip
Trip backup is breaker protection
times out.
BKR_FAIL
TRIP
NORMAL
BESTlogic Expression: VO5 = BFT
VO6
Not used
VO6
TRUE
FALSE
BESTlogic Expression: VO6 = 0
VO7
Not used
VO7
TRUE
FALSE
BESTlogic Expression: VO7 = 0
VO8
Reclose Initiate
TRUE when any protective element
trips.
RCL_INI
INI
NORMAL
BESTlogic Expression: VO8 = VO11
VO9
Recloser Drive to
Lockout
Drive recloser to lockout if: IN2 is
de-energized, virtual switch 143 is
closed, the breaker fails, or the
high-set instantaneous elements
trip.
RCL_DTL
DTL
NORMAL
BESTlogic Expression: VO9 = /IN2+143+VO5+150TQT