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CHAPTER 6: SETPOINTS
S3 PROTECTION
350 FEEDER PROTECTION SYSTEM – INSTRUCTION MANUAL
6–99
Figure 32: Negative Sequence Overvoltage logic diagram
Calculated
Negative
Sequence
V
oltage
SETPOINTS
SETPOINT
NEG
SEQ
OV
FUNCTN:
Disabled
=
0
Latched
Alarm
NEG
SEQ
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
V_2
Phase
VT
connection
Delta
Wy
e
LED:
PICKUP
NegSeq
Overvoltage
Message
V_2
or
Ö3
*V_2
>
PICKUP
NEG
SEQ
OV
DELA
Y:
SETPOINT
t
PKP
Ö
3
*
V_2
LED:
ALARM
RESET
Command
AND
S
R
LA
TCH
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