CHAPTER 6: SETPOINTS
S4 CONTROLS
350 FEEDER PROTECTION SYSTEM – INSTRUCTION MANUAL
6–149
Figure 6-62: Synchrocheck Logic diagram
SETPOINT
SETPOINT
FUNCTION
Enabled
=
1
Vca VT
Vbc VT
AND
SETPOINTS
Do Not Operate, Operate
OUTPUT
RELA
Y X
Vbn VT
Vcn VT
Vab VT
Aux VT
Input
Van VT
BLOCK
=
1
SETPOINT
Breaker Status OPEN
=1
ST
A
TUS
Line V
oltage Inputs
Vca Line V
oltage
Vbc Line V
oltage
Vbn Line V
oltage
Vcn Line V
oltage
Vab Line V
oltage
Van Line V
oltage
SETPOINT
Dead Bus Level
Live Bus Level
Dead Line Level
Live Line Level
<=
>
<=
>
AND
SETPOINT
Dead Line
-Dead Bus
LiveLine
-Dead Bus
Dead Line
-Live Bus
ANY
Live
-Dead Bus
Dead Line
-ANY
Bus
ONE Live
-OTHER Dead
NOT
BOTH Live
AND
AND
AND
AND
AND
AND
AND
AND
Sync Condition
Message
/Event Recorder
SETPOINT
Max V
oltage Dif
f
Measure value
abs
(Angline
-Angbus
)
abs
(Vline
-Vbus
)
abs
(Freqline
-Freqbus
)
Max Frequency Slip
Min Frequency Slip
Internal V
alue
<
<
<
AND
AND
Max
Angle Dif
f
Break Close
Time
SETPOINT
<
AND
Sync Close OP
Message
/Event Recorder
Angle Correction
Internal Calculation
-
AND
>=
>=
SETPOINT
Aux
(Bus
)
V
oltage Input
Vaux V
oltage
Dead Bus
>=
Live Bus
Message
Dead Line
>=
Live Line
Message
OR
DL
-D
B
LL
-D
B
DL
-L
B
ANYL
-D
B
DL
-ANYB
NOT
BOTH L
OR
ONEL
-OTHERD
Dead Bus
Live Bus
Dead Line
Live Line
DL
-L
B
LL
-D
B
SETPOINT
BYP
ASS
=
1
AND
AND
AND
0
Value
=
New
Angle Dif
f
Internal Calculation
898842A3.cdr
OR
Sync Operation
Message/ Event Recorder