CHAPTER 6: SETPOINTS
S3 PROTECTION
350 FEEDER PROTECTION SYSTEM – INSTRUCTION MANUAL
6–57
Figure 6-24: Ground directional logic diagram
Zero Sequence V
oltage(
-V
0)
SETPOINT
GND
DIR FUNCTION
:
Disabled
=
0
Latched
Alarm
SETPOINT
BLOCK
1:
Of
f=
0
BLOCK
2:
Of
f=
0
BLOCK
3:
Of
f=
0
OR
GND
DIR REVERSE
Alarm
OR
REVERSE
(Message
)
SETPOINT
:
Do Not Operate, Operate
OUTPUT
RELA
Y X
Control
Ground
Current
(Ig
)
Voltage Polarization
-3
V_
0
3I
_0
FWD
REV
REV
RUN
SETPOINT
GND
DIR MT
A
SETPOINT
MIN POL
VOL
TAGE
:
|V
0|
>
MINIMUM
Ig
>
0.0
5
x C
T
AND
AND
AND
Gnd
Dir Reverse
(Event Recorder
,T
ransient Recorder
)
OR
AND
LED
:ALARM
RESET
Command
AND
S
R
LA
TCH
SETPOINT
BLK GOC DIR UNDEF
Enabled
( * )
Polarizing voltage will be
3
V
0
when voltage is measured from the auxiliary voltage channel
AND
AND
BLK GND DIR OC UNDEF
(T
o Ground
TOC and Ground IOC
)
FOW
ARD
(T
o Ground
TOC and Ground IOC
)
(T
o Ground
TOC and Ground IOC
)
(Message
)
(Flexlogic
)
(Event Recorder
,T
rasient
Recorder
)
898018A3.CDR
