CHAPTER 6: SETPOINTS
S4 CONTROLS
350 FEEDER PROTECTION SYSTEM – INSTRUCTION MANUAL
6–121
Figure 6-56: Logic Element logic diagram
TRIGGER SOURCE
1
Of
f
Of
f
OR
,AND
,NOR
,
NAND
,XOR
,XNOR
AND
PKP
TIME DELA
Y
SETPOINT
t
PKP
t
RST
LE
1
ASSER
TED ST
AT
E:
SETPOINT
t
PKP
Of
f
On
Event Recorder
Transient Recorder
SETPOINT
Do Not Operate, Operate
OUTPUT
RELA
Y X
RST
TIME DELA
Y
Logic Elem
1O
P
Logic Elem
1
DPO
Logic Elem
1
PKP
LED
:
PICKUP
Message
SETPOINT
LOGIC EL
FUNCTION
Disabled
=
0
Latched
Alarm
Operate Output Relay
1
(TRIP
)
LED
:
ALARM
LED
:TRIP
Alarm
OR
OR
AND
RESET
Command
Trip
AND
AND
Control
S
R
LA
TCH
t
PKP
TRIGGER LOGIC
SETPOINT
TRIGGER SOURCE
8
t
PKP
TRIGGER INPUTS
SETPOINT
2t
o
8
BLOCK
1
Of
f
Of
f
OR
,AND
,NOR
,
NAND
,XOR
,XNOR
t
PKP
BLOCK LOGIC
SETPOINT
BLOCK
4
t
PKP
BLOCK INPUTS
SETPOINT
2t
o
4
. . .
. . .
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