GE MI-869 - Page 309

CHAPTER 4: SETPOINTS PROTECTION
869 MOTOR PROTECTION SYSTEM – INSTRUCTION MANUAL 4–191
Figure 4-63: Neutral Time Overcurrent Protection logic diagram
894035A3.cdr
SETPOINTS
RUN
SETPOINTS
FUNCTION: Disabled = 0 Trip
PICKUP: CURVE: TDM:
In > PICKUP
AND
Operate Output Relay 1 (TRIP)
LED: PICKUP
LED: TRIP
Alarm
OR
OR
Adjust PKP
AND
Latched Alarm
AND
RESET:
Neutral current (In)
Calculated as a sum of
phase currents
SETPOINTS
BLOCK: Off = 0
From Autoreclose
(per shot settings)
From Cold Load Pickup
LED: ALARM
RESET
Command
AND
S R
LATCH
SETPOINTS
Do Not Operate, Operate OUTPUT RELAYS
SETPOINTS
INPUT: Phasor, RMS
Configurable
Ntrl TOC 1 PKP
FLEXLOGIC OPERANDS
Ntrl TOC 1 OP
FLEXLOGIC OPERANDS
DIRECTION:
Direction (from Neutral
Directional OC element)
Set
Dominant
From Manual Close
Blocking
SETPOINTS SIGNAL INPUT: CT Bank 1 – J1
USED ONLY IN
850
USED ONLY IN 845
/
889
CONFIGURABLE IN
845