GE 869 - Page 329

CHAPTER 4: SETPOINTS PROTECTION
869 MOTOR PROTECTION SYSTEM – INSTRUCTION MANUAL 4–197
Figure 4-70: Neutral Instantaneous Overcurrent Protection logic diagram
894036A3.cdr
SETPOINTS
I_0 and I_1
RUN
SETPOINTS
BLOCK: Off = 0
PICKUP:
3 * (|I_0| - K * |I_1|) >
PICKUP
OR
AND
Operate Output Relay 1 (TRIP)
LED: TRIP
OR
OR
From Cold Load Pickup
Neutral 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
RST
Configurable
Ntrl IOC 1 PKP
FLEXLOGIC OPERANDS
Ntrl IOC 1 OP
FLEXLOGIC OPERANDS
Set
Dominant
Direction (from Neutral
Directional OC element)
From Manual Close
Blocking
SETPOINTS
SIGNAL INPUT CT Bank 1 - J1
CONFIGURABLE IN
845
USED ONLY IN
845/ 889
USED ONLY IN
850