8-42
Application
BE1-951
SL-62:0,0,0
SL-162:0,0,0
SL-79:0,0,0,0,0
SL-81:0,0
SL-181:0,0
SL-281:0,0
SL-381:0,0
SL-481:0,0
SL-581:0,0
SL-BF:0,0,0
SL-GROUP:2,IN3,0,0,0,0
SL-43:0
SL-143:0
SL-243:0
SL-343:2
SL-101:1
SL-VOA:0
SL-VO1:101T+VO8*SG0
SL-VO2:101C
SL-VO3:VO8*/VO15*SG0
SL-VO4:VO9*SG0
SL-VO5:VO11*SG1
SL-VO6:0
SL-VO7:0
SL-VO8:51PT+51NT+51QT
SL-VO9:50TPT+50TNT+50TQT
SL-VO10:0
SL-VO11:50TPT+50TNT+50TQT+51PT+51NT+51QT
SL-VO12:51PPU+51NPU+51QPU
SL-VO13:SG1
SL-VO14:0
SL-VO15:343+/IN4
Table 8-21. BACKUP Contact Sensing Input Logic
Input
Purpose
Variable Label
State Labels
Closed (1)
Open (0)
IN1
51b breaker status
BREAKER
OPEN
CLOSED
IN2
Places relay in feeder backup mode when out of
service feeder relay is detected by open contact.
FEEDERS-OK
NORMAL
FDR_OOS
IN3
Initiates breaker failure (BFI) by external relays.
EXT-BFI
BFI-INI
NORMAL
IN4
Places the relay in test mode so that breaker failure is
disabled when IN4 is de-energized.
TESTDISABL
NORMAL
TSTMODE
Table 8-22. BACKUP Function Block Logic
Function
Purpose
BESTlogic
Expression
Mode Setting
50TP
Requires 18-20 cycle coordination delay since no
blocking is provided for feeder relay pickup. Used for
backup bus fault trip.
0
1
(enabled)
50TN
Requires 18-20 cycle coordination delay since no
blocking is provided for feeder relay pickup. Used for
backup bus fault trip.
0
1
(3-Phase
Residual)