GE 889 - Page 264

4–134 889 GENERATOR PROTECTION SYSTEM – INSTRUCTION MANUAL
PROTECTION CHAPTER 4: SETPOINTS
Figure 4-46: Generator Unbalance Logic Diagram
RUN
RUN
Alarm Pickup
SETPOINT
I2/RATED FLA *100 ≥
Alarm
Pickup
Alarm Pickup Delay
SETPOINTS
t
PKP
0
SETPOINT
Configurable Trip Function:
Disabled=0 Trip
SETPOINT
Block
Off=0
SETPOINT
LATCH ALARM Alarm Function:
Disabled=0 ALARM
OR
AND AND
FLEXLOGIC OPERANDS
Unbal Alarm PKP
SETPOINT
Output Relay
Do Not Operate, Operate
Unbal Alarm OP
AND AND
OR
LATCH
S R
RESET
Command
LED: Alarm
FLEXLOGIC OPERANDS
Unbal PKP
SETPOINT
Output Relay
Do Not Operate, Operate
Unbal OP
Operate Output
Relay 1(TRIP)
LED: TRIP
OR
AND
SETPOINT
Constant K
Maximum Time
Reset Rate
t
I_ 2
Calculated Values
Neg. Seq. Current I_2
I2/ RATED FLA *100 ≥Trip
Pickup
Unbal DPO
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