GE Multilin 850

CHAPTER 4: SETPOINTS PROTECTION
850 FEEDER PROTECTION SYSTEM – INSTRUCTION MANUAL 4–123
TARGETS
Range: Self-reset, Latched, Disabled
Default: Self-reset
Figure 4-45: Phase Time Overcurrent Protection logic diagram
894149A1.CDR
SETPOINTS
Phase A current (Ia)
SETPOINT
FUNCTION: Disabled Trip
PICKUP: CURVE: TDM:
Phase B current (Ib) Phase C current (Ic)
OR
Operate Output Relay 1 (TRIP)
LED: PICKUP
OR
Alarm
OR
OR
Phase Currents
AND
Latched Alarm
AND
RUN Ia > PICKUP RUN Ib > PICKUP RUN Ic > PICKUP Adjust PKP Adjust PKP Adjust PKP
SETPOINTS
BLOCK : Off = 0
LED: ALARM
RESET
Command
AND
S R
LATCH
Configurable
FlexLogic Operands
Phase TOC 1 OP Phase TOC 1 OP:C Phase TOC 1 OP:B Phase TOC 1 OP:A
FlexLogic Operands
Phase TOC 1 PKP Phase TOC 1 PKP C Phase TOC 1 PKP B Phase TOC 1 PKP A
SETPOINTS INPUT:
Phasor, RMS
RESET:
From Cold Load Pickup
TOC Pickup Raise
From Autoreclose
TOC Pickup Raise
SETPOINTS
OUTPUT RELAYS Do Not Operate, Operate
LED: TRIP
Set
Dominant
From Manual Close Blocking
TOC Pickup Raise
RUN
Calculate Voltage Restraint Multiplier
SETPOINT
VOTAGE RESTRAINT: Disabled Enabled
AND
Ph A Reverse (from Phase
Directional OC element)
SETPOINTS
DIRECTION: Disabled Forward Reverse
OR
AND AND
AND AND
Ph B Reverse (from Phase
Directional OC element)
Same Logic as for Phase A
Ph C Reverse (from Phase
Directional OC element)
Same Logic as for Phase A
AND
OR
SETPOINTS SIGNAL INPUT: CT Bank 1 – J1
CONFIGURABLE IN
845
USED ONLY IN
850
USED ONLY IN 845