6–70
350 FEEDER PROTECTION SYSTEM – INSTRUCTION MANUAL
S3 PROTECTION
CHAPTER 6: SETPOINTS
Figure 18: Ground/Sensitive Ground timed overcurrent protection: Logic Diagram
SETPOINTS
RUN
SETPOINT
GND
T
O
C
FUNCTION:
Disabled
=
0
Alarm
GND
T
O
C
PICKUP:
GND
T
O
C
CUR
VE:
GND
T
O
C
T
D
MUL
TIPLIER:
Ig
>
PICKUP
AND
Operate
Output
Relay
1
(TRIP)
Event
Recorder
T
ransient
Recorder
LED:
PICKUP
GND
T
O
C
PKP
LED:
TRIP
Event
Recorder
T
ransient
Recorder
Latched
Alarm
OR
OR
Message:
GND
T
O
C
OP
Adjust
PKP
Adjust
Gnd/S.Gnd
T
O
C
PKP
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
Tr
ip
(T
o
Breaker
Failure)
GND
T
O
C
RESET
:
Ground/Sens.
Ground
current
(Ig)
From
Ground
CT
or
,
From
Sens.
Ground
CT
SETPOINTS
BLOCK
1:
O
ff=0
BLOCK
2:
O
ff=0
BLOCK
3:
O
ff=0
OR
Autoreclose
(per
shot
settings)
Cold
Load
PKP
LED:
ALARM
RESET
Command
AND
S
R
LA
TCH
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