GE Multilin 850

CHAPTER 4: SETPOINTS PROTECTION
850 FEEDER PROTECTION SYSTEM – INSTRUCTION MANUAL 4–151
Figure 4-56: Sensitive Ground Time Overcurrent Protection logic diagram
894039A2.cdr
SETPOINTS
RUN
SETPOINTS
FUNCTION: Disabled = 0
Trip
PICKUP: CURVE: TDM:
Isg > PICKUP
AND
Operate Output Relay 1 (TRIP)
LED: PICKUP
LED: TRIP
Alarm
OR
OR
Adjust PKP
AND
Latched Alarm
AND
RESET:
Sens Ground current (Isg)
From Sensitive Ground CT
SETPOINTS
BLOCK: Off = 0
From Cold Load Pickup
LED: ALARM
RESET
Command
AND
S R
LATCH
SETPOINTS
Do Not Operate, Operate OUTPUT RELAYS 3 to 7
SETPOINTS
INPUT: Phasor, RMS
Configurable
SGnd TOC 1 PKP
FLEXLOGIC OPERANDS
SGnd TOC 1 OP
FLEXLOGIC OPERANDS
DIRECTION:
Direction (from Sens Ground
Directional OC element)
From Autoreclose
(per shot settings)
Set
Dominant
From Manual Close
Blocking