GE 845 - Page 458

4–330 845 TRANSFORMER PROTECTION SYSTEM – INSTRUCTION MANUAL
CONTROL CHAPTER 4: SETPOINTS
Figure 4-135: Synchrocheck logic diagram
SETPOINT
FUNCTION: Enabled
FlexLogic Operands
Sync1 OK
SETPOINTS
Do Not Operate, Operate OUTPUT RELAY 3 (X)
DV <= MAX VOLTS DIFF
AND
SETPOINT
BLOCK : Off = 0 Magnitude V
bv
Disabled
SETPOINTS
MAX VOLT DIFFERENCE:
SETPOINT
DEAD SOURCE PERM: Disabled L BUS & D LINE L LINE & D BUS
Sync1 Dead Src OK
Phase F
bv
Frequency f
bv
Magnitude V
lv
Phase F
lv
Frequency f
lv
DV = |V3phv – V1phv|
Df = |f
3phv – f1phfv|
DF=|(F
3phv – F1phv)|
MAX FREQ DIFFERENCE: MAX ANGLE DIFFERENCE:
Df <= MAX FREQ DIFF
DF <= MAX ANGLE DIFF
Vbus >= LIVE BUS V MIN
SETPOINT
LIVE BUS VOLTS MIN:
Vline >= LIVE LINE V MIN
SETPOINT
LIVE LINE VOLTS MIN:
Vbus<=DEAD BUS V MAX
SETPOINT
LIVE BUS VOLTS MAX: Vline<=DEAD LINE V MAX
SETPOINT
DEAD LINE VOLTS MAX: D LINE & D BUS D LINE OR D BUS D LINE XOR D BUS
OR XOR
AND AND AND AND AND
OR
ANDAND AND AND AND AND
OR
Sync1 Close Perm Sync1 Live Bus Sync1 Live Line Sync1 Dead Bus Sync 1 Dead Line
MAX FREQ HYSTERESES:
TO: Autoreclose Undervoltage restoration Underfrequency restoration Manual local/remote closing TO: Transfer Scheme
Bus (Line) voltage Associated setpoints from System/ Voltage Sensing / Phase VT connection Line (Bus) voltage Associated setpoints from System/Voltage Sensing / Aux VT connection
Transfer Initiate
from Tie-Breaker Transfer scheme
from Breaker State Detection
BKR 1 Disconnected
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