CHAPTER 6: SETPOINTS
S3 PROTECTION
350 FEEDER PROTECTION SYSTEM – INSTRUCTION MANUAL
6–97
Figure 31: Neutral Overvoltage logic diagram
Calculated
Neutral
V
oltage
V0
SETPOINTS
SETPOINT
NTRL
OV
FUNCTION:
Disabled
=
0
Latched
Alarm
NTRL
OV
PICKUP:
AND
Operate
Output
Relay
1
(TRIP)
Event
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
rip
(T
o
B
reaker
Failure)
SETPOINTS
BLOCK
1:
O
ff=0
BLOCK
2:
O
ff=0
BLOCK
3:
O
ff=0
OR
RUN
Vn
=
3V0
LED:
PICKUP
Neutrl
OV
T
rip
(Alarm)
-
PKP
,O
P
Message
3V0
>
PICKUP
NTRL
OV
DELA
Y:
SETPOINT
t
PKP
LED:
ALARM
RESET
Command
AND
S
R
LA
TCH
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