GE 889 - Page 280

4–150 889 GENERATOR PROTECTION SYSTEM – INSTRUCTION MANUAL
PROTECTION CHAPTER 4: SETPOINTS
Figure 4-53: Third Harmonic Voltage Difference logic diagram
894142.cdr
Block
SETPOINT
Off
AND
SETPOINT
TRIP PICKUP:
TRIP FUNCTION:
SETPOINT
Disable
| V1| > 0.5 x VT
Trip Configurable
OR
Metering/Generator/Stat Gnd 3rd Harm
ACTUAL VALUES
3rd Harm VN in Sec 3rd Harm V0 in Sec
ACTUAL VALUES
V1
Metering/Ph VT Bnk1-J2/J2 V1
ALARM FUNCTION:
SETPOINT
Disable Alarm Latch Alarm
OR
SETPOINT
TRIP PICKUP DELAY: t
PKP
20 ms
RUN
AND
SETPOINT
ALARM PICKUP:
Pickup
1- Pickup
≥ > Supv
RUN
AND
SETPOINT
ALARM PICKUP DELAY: t
PKP
20 ms
AND
FLEXLOGIC OPERANDS
3rd V Dif TRIP OP
AND
Operate Output
Relay 1(TRIP)
LED: TRIP
3rd V Dif TRIP PKP
SETPOINTS
TRIP RELAY Do Not Operate, Operate
AND AND
OR
LATCH
S R
RESET
Command
LED:
ALARM
FLEXLOGIC OPERANDS
3rd V Dif ALM OP 3rd V Dif ALM PKP
SETPOINTS
ALARM RELAY Do Not Operate, Operate
TRIP SUPV: ALARM SUPV:
|V
N(3rd)
+V
0(3 rd)
|
|V
N(3rd)
|
|V
N(3rd)
+V
0(3rd)
|
|V
0(3 rd )
|
|V
N(3rd)
+V
0(3rd)
|
|V
0(3rd)
|
|V
N(3rd)
+V
0(3rd)
|
|V
N(3rd)
|
|V
N(3rd)
+V
0(3rd)
|
|V
N(3rd)
+V
0(3 rd)
|
Pickup
1- Pickup
≥
> Supv
|V
0(3rd)
|
|V
N(3rd)
+V
0(3rd)
|
|V
N(3rd)
|
|V
N(3rd)
+V
0(3rd)
|
|V
N(3rd)
+V
0(3rd)
|