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CHAPTER 6: SETPOINTS
S3 PROTECTION
350 FEEDER PROTECTION SYSTEM – INSTRUCTION MANUAL
6–89
Figure 26: Negative sequence instantaneous overcurrent protection logic diagram
Calculated
Negative
Sequence
Current
SETPOINTS
SETPOINT
NEG
SEQ
IOC
FUNCTN
:
Disabled
=
0
Latched
Alarm
NEG
SEQ
IOC
PICKUP
:
AND
Operate
Output
Relay
1
(TRIP)
Event
Recorder
T
ransient
Recorder
LED:
TRIP
Alarm
OR
OR
AND
SETPOINTS
Operate
output
relays
upon
selection
OUTPUT
RELA
Y
4
OUTPUT
RELA
Y
5
OUTPUT
RELA
Y
6
OUTPUT
RELA
Y
3
T
rip
AND
T
o
Breaker
Failure
T
rip
SETPOINTS
BLOCK
1:
Of
f
=
0
BLOCK
2:
Of
f
=
0
BLOCK
3:
Of
f
=
0
OR
RUN
LED:
PICKUP
Event
Recorder
T
ransient
Recorder
NegSeq
IOC
Message
I_2
>
PICKUP
NEG
SEQ
IOC
DELA
Y
:
SETPOINT
t
PKP
I_2
LED:
ALARM
RESET
Command
AND
S
R
LA
TCH
0
898795.cdr