GE 869 - Page 341

CHAPTER 4: SETPOINTS PROTECTION
869 MOTOR PROTECTION SYSTEM – INSTRUCTION MANUAL 4–209
Figure 4-75: Negative Sequence Instantaneous Overcurrent logic diagram
894042A2.cdr
SETPOINTS
I_2 and I_1
RUN
SETPOINTS
BLOCK: Off = 0
PICKUP:
(|I_2| – K * |I_1|)>
PICKUP
OR
AND
Operate Output Relay 1 (TRIP)
LED: TRIP
OR
OR
From Cold Load Pickup
Negative Sequence IOC
source
AND AND
SETPOINT
FUNCTION: Disabled = 0 Trip Alarm Latched Alarm
PICKUP DELAY:
SETPOINTS
t
PKP
From Autoreclose
(per shot settings)
LED: ALARM
RESET
Command
AND
S R
LATCH
LED: PICKUP
SETPOINTS
Do Not Operate, Operate OUTPUT RELAYS
DIRECTION:
Phasor
DROPOUT DELAY:
t
DP
O
Configurable
Neg Seq IOC 1 PKP
FLEXLOGIC OPERANDS
Neg Seq IOC 1 OP
FLEXLOGIC OPERANDS
Set
Dominant
Direction (from Neg Seq Directional OC element)
From Manual Close
Blocking
SETPOINTS
SIGNAL INPUT: CT Bank 1 - J1
USED ONLY IN 845/889
USED ONLY IN 850
CONFIGURABLE IN 845