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CHAPTER 6: SETPOINTS
S3 PROTECTION
345 TRANSFORMER PROTECTION SYSTEM – INSTRUCTION MANUAL
6–99
Figure 29: Ground/Sensitive Ground Instantaneous Overcurrent Protection logic
diagram
SE
TP
OINT
RUN
SE
TP
OINT
BL
OCK
1
O
ff=0
GND
IOC
PICK
UP
Ig
>
PICK
UP
BL
OCK
2
O
ff=0
BL
OCK
3
O
ff=0
OR
AND
OR
OR
AND
AND
SE
TP
OINT
GND
IOC
FUNCTION
Disabled
=
0
Latched
Alarm
Alarm
Trip
GND
IOC
PKP
DEL
AY
SE
TP
OINT
t
PKP
0
LED:
AL
ARM
RESE
T
Command
AND
S
R
LA
TC
H
LED:
TRIP
To
Br
eaker
Failur
e
Trip
SE
TP
OINTS
(configurable
on
ly
if
“TRIP
”
function
select
ed
)
Operate
trip
output
relays
upon
selection
RL
Y
2
TRIP
W2
BKR
SETPOINTS
:
Operate
output
relays
upon
selection
OUTPUT
REL
AY
4
OUTPUT
REL
AY
5
OUTPUT
REL
AY
6
OUTPUT
REL
AY
3
Message
and
Event
Recorder
GND
T
O
C
OP
Gr
ound/Sens.
Gr
ound
curr
ent
(Ig)
C
T(W1),
C
T(W2)
gr
ound
curr
ent
select
ed
under
GND
TO
C
C
T
INPUT
GND
IOC
CT
INPUT
LED:
PICK
UP
Message
and
Ev
ent
Recor
der
GND
TO
C
PKP
RL
Y
1
TRIP
W1
BKR
89781
1.cdr