CHAPTER 6: SETPOINTS
S4 CONTROLS
350 FEEDER PROTECTION SYSTEM – INSTRUCTION MANUAL
6–127
Figure 44: Cold load pickup logic diagram
Ia<3
%C
T
Ib<3
%C
T
Ic<3
%C
T
Ia
<
10%
CT
Ib
<
10%
CT
Ic
<
10%
CT
CLP
INITIA
TE
CLP
FUNCTION:
Disabled
Alarm
Latched
Alarm
OUT
A
G
E
TIME
BEFORE
C
OLD
LO
AD
ENABLE
RESE
T
RUN
BL
OCK
TIME
C
OLD
LO
AD
ENABLE
RUN
BL
OCK
PH
IOC1
BL
OCK
PH
IOC2
BL
OCK
NTRL
IOC1
BL
OCK
NTRL
IOC2
BL
OCK
GND
.S
.GND
IOC1
BL
OCK
GND
.S
.GND
IOC2
Ye
s=1
,N
o=0
Ye
s=1
,N
o=0
Ye
s=1
,N
o=0
Ye
s=1
,N
o=0
Ye
s=1
,N
o=0
Ye
s=1
,N
o=0
RESE
T
LED:
AL
ARM
OUTPUT
REL
AY
3
OUTPUT
REL
AY
4
OUTPUT
REL
AY
5
OUTPUT
REL
AY
6
Operate
output
relays
upon
selection
Recor
d
E
vent
Message
Cold
Load
PKP
Blk
RAISE
PH
TOC
PKP
RAISE
NTRL
TOC
PKP
RAISE
GND/S
.GND
TO
C
PKP
Raise
by
P
er
cent
Raise
by
P
er
cent
Raise
by
P
er
cent
Block
Block
Block
Block
Block
Block
Select
Setpoint
Gr
oup
Gr
oup
No
.
Raise
Pick
up
Raise
Pick
up
Raise
Pick
up
Select
Gr
oup
898706A1.
cdr
AND
AND
AND
AND
AND
AND
AND
AND
AND
AND
AND
AND
OR
AND
OR
OR
AND
AND
AND
OR
Command
LA
TC
H
Cold
Load
Pick
up
armed
(External
Input)
A
U
TORECL
OSE
A
CTIVE
SE
TP
OINT
SE
TP
OINT
SE
TP
OINT
SE
TP
OINT
SE
TP
OINT
SE
TP
OINT
SE
TP
OINT
SE
TP
OINT
SE
TP
OINT
SE
TP
OINT
SE
TP
OINT
SE
TP
OINT
SE
TP
OINT
SE
TP
OINT
SE
TP
OINT
BL
OCK
NEG
SEQ
IOC
Ye
s=1
,N
o=0
Block
AND
SE
TP
OINT
