8-38 BE1-951 Application 9328900990 Rev L
State Labels
Output Purpose Description Label
True False
VO12
Protection Picked Up
Expression.
TRUE when any 50 or 51
element picks up.
PROT_PU PU NORMAL
BESTlogic Expression: VO12=50TPPU+50TNPU+50TQPU+51PPU+51NPU+51QPU
VO13
Feeder Backup Mode
Alarm.
TRUE when in Setting Group 1. FEEDER_BU BACKUP NORMAL
BESTlogic Expression: VO13=SG1
VO14 N/A N/A VO14 TRUE FALSE
BESTlogic Expression: VO14=0
VO15 Test Mode.
Blocks the BFI signal (VO3) to
an external breaker failure relay.
TRUE when IN4 de-energizes
or Virtual Switch 343 closes.
TEST_MODE TEST NORMAL
BESTlogic Expression: VO15=343+/IN4
BE1-951
D2849-03
01-05-00
52
OUT1
TRIP
51P 51N 51Q
OUT5
50TQ50TN50TP
101
IN2
INST
BLOCK
GROUP
CONTROL
T
C
CLOSE
OUT2
OUT3
OUT4
IN3
2
Relay is shown in Normal mode (not in Test mode).
If the feeder relay is out of service, the 50T and 51 elements are diverted from
OUT1 and OUT4 to OUT5 for feeder protection.
2
1
Figure 8-10. BUS One-Line Diagram
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