CHAPTER 6: SETPOINTS
S3 PROTECTION
350 FEEDER PROTECTION SYSTEM – INSTRUCTION MANUAL
6–65
Figure 16: Phase Time Overcurrent Protection Logic Diagram
SETPOINTS
Phase
A
current
(IA)
SETPOINT
PH
T
O
C
FUNCTION:
Disabled
=
0
Latched
Alarm
PH
T
O
C
PICKUP:
PH
T
O
C
CUR
VE:
PH
T
O
C
TDM:
AND
Phase
B
current
(IB)
Phase
C
current
(IC)
OR
Operate
Output
Relay
1
(TRIP)
Event
Recorder
T
ransient
Recorder
LED:
PICKUP
LED:
TRIP
OR
Event
Recorder
T
ransient
Recorder
Alarm
OR
OR
Cold
Load
PKP
Phase
Currents
Adjust
Phase
T
OC
PKP
AND
SETPOINTS:
Operate
output
relays
upon
selection
OUTPUT
RELA
Y
4
OUTPUT
RELA
Y
5
OUTPUT
RELA
Y
6
OUTPUT
RELA
Y
3
Tr
ip
AND
T
rip
(T
o
Breaker
Failure)
PH
T
O
C
P
H
A
OP
PH
T
O
C
P
H
BO
P
PH
T
O
C
P
H
CO
P
Message
:
PH
T
O
C
O
P
PH
T
O
C
P
H
A
PKP
PH
T
O
C
P
H
B
PKP
PH
T
O
CP
HC
PKP
PH
T
O
C
PKP
PH
T
O
C
RESET
TIME:
RUN
IA
>
PICKUP
RUN
IB
>
PICKUP
RUN
IC
>
PICKUP
Adjust
PKP
Adjust
PKP
Adjust
PKP
SETPOINTS
BLOCK
1:
O
ff=0
BLOCK
2:
O
ff=0
BLOCK
3:
O
ff=0
OR
Autoreclose
(per
shot
settings)
LED:
ALARM
RESET
Command
AND
S
R
LA
TCH
898010.cdr
