GE 350-A9

CHAPTER 6: SETPOINTS S4 CONTROLS
350 FEEDER PROTECTION SYSTEM – INSTRUCTION MANUAL 6–157
Figure 6-66: Arc Flash logic diagram
898865A2.cdr
SETPOINTS
HS Phase A current (Iahs)
RUN
SETPOINTS
Function:
Disabled= 0
Trip
HS Phase PKP:
HS Phase B current (Ibhs) HS Phase C current (Ichs)
Operate Output Relay 1 ( TRIP)
Alarm
OR
OR
HS Phase Currents
AND
Latched Alarm
AND
Iahs> PICKUP
LED: ALARM
AND
S R
LATCH
Control
LED: TRIP
Set Dominant
RUN
Ighs> PICKUP
HS Ground current (Ighs)
Ibhs> PICKUP
Ichs> PICKUP
SETPOINTS
HS Ground PKP
Light Sensor1 Light Sensor2 Light Sensor3
Light Sensor Input
Light Sensor 4
Light Sensor 1 > Factory
Threshold
Light Sensor 4 > Factory
Threshold
Light Sensor 3 > Factory
Threshold
Light Sensor 2 > Factory
Threshold
OR
AND
OR
Arc Flash OP
Logic Operands
RESET
Command
Arc Flash Light 1 OP Arc Flash Light 2 OP Arc Flash Light 3 OP Arc Flash Light 4 OP
Logic Operands
SETPOINTS
BLOCK Off = 0
AND
HS Ph A IOC OP
HS Ph B IOC OP HS Ph C IOC OP HS GND IOC OP Logic Operands
RUN
RUN RUN
RUN
0ms
¼
cycle
0ms 0ms 0ms
Reset Delay
OR
AND AND AND
0ms
tms
SEAL
-IN TIMER
LATCH
Hardware control
¼ cycle
¼ cycle ¼ cycle