GE 350-A9

CHAPTER 6: SETPOINTS S4 CONTROLS
350 FEEDER PROTECTION SYSTEM – INSTRUCTION MANUAL 6–149
Figure 6-62: Synchrocheck Logic diagram
SETPOINT
SETPOINT
FUNCTIONEnabled = 1
Vca VT Vbc VT
AND
SETPOINTS
Do Not Operate, Operate
OUTPUT RELAY X
Vbn VT
Vcn VT
Vab VT
Aux VT Input
Van VT
BLOCK = 1 SETPOINT
Breaker Status OPEN=1
STATUS
Line Voltage Inputs
Vca Line Voltage Vbc Line Voltage
Vbn Line Voltage
Vcn Line Voltage
Vab Line Voltage Van Line Voltage
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 Voltage Diff
Measure value
abs(Angline-Angbus)
abs(Vline-Vbus)
abs(Freqline-Freqbus)
Max Frequency Slip
Min Frequency Slip
Internal Value
<
< <
AND AND
Max Angle Diff
Break Close Time
SETPOINT
<
AND
Sync Close OP
Message/Event Recorder
Angle Correction
Internal Calculation
-
AND
>= >=
SETPOINT
Aux(Bus) Voltage Input
Vaux Voltage
Dead Bus >= Live Bus
Message
Dead Line >= Live Line
Message
OR
DL-DB
LL-DB DL-LB
ANYL-DB DL-ANYB
NOT BOTH L
OR
ONEL-OTHERD
Dead Bus
Live Bus
Dead Line
Live Line
DL-LB LL-DB
SETPOINT
BYPASS = 1
AND AND
AND
0 Value
=
New Angle Diff
Internal Calculation
898842A3.cdr
OR
Sync Operation
Message/ Event Recorder