CHAPTER 6: SETPOINTS
S3 PROTECTION
350 FEEDER PROTECTION SYSTEM – INSTRUCTION MANUAL
6–77
Figure 21: Ground directional logic diagram
Zero
Sequence
V
oltage
(-V0)
SETPOINT
GND
DIR
FUNCTION
Disabled
=
0
Latched
Alarm
SETPOINTS
BLOCK
1
Of
f
=
0
BLOCK
2
Of
f
=
0
BLOCK
3
Of
f
=
0
OR
GND
DIR
REVERSE
Alarm
OR
OR
REVERSE
(Message)
AND
SETPOINT
:
Operate
Output
Relays
Upon
Selection
OUTPUT
RELA
Y
4
OUTPUT
RELA
Y
5
OUTPUT
RELA
Y
6
OUTPUT
RELA
Y
3
Control
Ground
Current
(Ig)
V
oltage
Polarization
-3V_0
3I_0
FWD
REV
REV
RUN
SETPOINT
GND
DIR
MT
A
SETPOINT
MIN
POL
VOL
T
AGE
|V0|
>
MINIMUM
Ig>0
.0
5xC
T
AND
AND
AND
Gnd
Dir
Reverse
(Event
Recorder
,
T
ransient
Recorder)
Direction
OK
LED:
ALARM
RESET
Command
898018A1.cdr
AND
LA
TCH
S
R