GE Multilin 350 Series

6–80 350 FEEDER PROTECTION SYSTEM – INSTRUCTION MANUAL
S3 PROTECTION CHAPTER 6: SETPOINTS
Figure 22: Neutral Timed Overcurrent Protection: Logic Diagram
SETPOINTS
Neutral current (IN)
RUN
SETPOINTS
BLOCK 1: Off=0
NTRL TOC PICKUP: NTRL TOC CURVE: NTRL TOC TDM:
IN > PICKUP
BLOCK 2: Off=0 BLOCK 3: Off=0
OR
AND
Operate Output Relay 1 (TRIP)
Event Recorder
Transient Recorder
NTRL TOC PKP
LED: TRIP
Event Recorder
Transient Recorder
OR
OR
NTRL TOC OP
Adjust PKP
Cold Load PKP
Computed by the relay
Adjust Neutral TOC
PKP
AND
SETPOINTS:
Operate
output relays
upon
selection
OUTPUT RELAY 4 OUTPUT RELAY 5 OUTPUT RELAY 6 OUTPUT RELAY 3
AND
Trip
(To Breaker Failure)
NTRL TOC RESET:
SETPOINTS
NTRL TOC DIRECTION: Forward Disabled Reverse
SETPOINT
NTRL TOC FUNCTION: Disabled = 0
Latched Alarm Alarm
Trip
AND AND
Current in Reverse
From NEUTRAL DIRECTIONAL
Current OK
Autoreclose
(per shot settings)
LED: ALARM
RESET
Command
AND
S
R
LATCH
LED: PICKUP
Message:
898008.cdr
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