GE 845 - Page 339

CHAPTER 4: SETPOINTS PROTECTION
845 TRANSFORMER PROTECTION SYSTEM – INSTRUCTION MANUAL 4–211
Figure 4-77: Auxiliary Overvoltage Protection logic diagram
894076A3.cdr
SETPOINTS
Auxiliary Voltage (Vx)
SETPOINT
FUNCTION: Disabled Trip
PICKUP:
AND
Operate Output Relay 1 (TRIP)
LED: TRIP
Alarm
OR
OR
Auxiliary voltage
AND
Latched Alarm
AND
Vx > PICKUP
RUN
SETPOINTS
BLOCK : Off = 0
LED: ALARM /
LATCHED ALARM
RESET
Command
AND
S R
LATCH
Configurable
FlexLogic Operands
Aux OV OP: Aux OV PKP:
PICK-UP DELAY: DROP-OUT DELAY:
LED: PICKUP
SETPOINTS
Do Not Operate, Operate OUTPUT RELAYS 3 to 7
SETPOINTS
SIGNAL INPUT: NAME( Ax VT Bnk1-J2
889
Overvoltage Curves:
t PKP
t RST