GE 889 - Page 453

CHAPTER 4: SETPOINTS MONITORING
889 GENERATOR PROTECTION SYSTEM – INSTRUCTION MANUAL 4–323
Figure 4-133: Speed Protection logic diagram
894177A2.cdr
SETPOINT
Configurable
TRIP FUNCTION:
Disabled Trip
SETPOINT
Latched Alarm ALARM FUNCTION:
Disabled
Alarm
OR
RUN
TRIP PICKUP:
SETPOINT
TRIP PICKUP DELAY:
SETPOINTS
t
PKP
0
ALARM PICKUP DELAY:
SETPOINTS
t
PKP
0
AND
Operate Output
Relay 1(TRIP)
LED: TRIP
LED: Alarm
AND AND
OR
LATCH
S R
RESET
Command
Speed Trip PKP
FLEXLOGIC OPERANDS
Speed Trip OP
Speed Alarm PKP
FLEXLOGIC OPERANDS
Speed Alarm OP
SETPOINT
Trip Output Relay X
Do Not Operate, Operate
SETPOINT
Alarm Output Relay X
Do Not Operate, Operate
OR
Speed < Trip Pickup
ALARM PICKUP:
SETPOINT
Filtering
AND AND
Speed
ACTUAL VALUES
SETPOINT
DIRECTION:
Under Speed Over Speed
AND AND
RUN
Speed > Trip Pickup
RUN
Speed< Alarm Pickup
RUN Speed> Alarm Pickup
SETPOINT
BLOCK:
Off = 0
SETPOINT
INPUT:
Off=0
Contact Input X
status
AND
Speed Measurement
RUN
RATED SPEED:
SETPOINTS
Assign Contact Input
Pulses Per Rev: