GE 350-A9, Instruction Manual

Page: 200 / 334

6–70 350 FEEDER PROTECTION SYSTEM – INSTRUCTION MANUAL
S3 PROTECTION CHAPTER 6: SETPOINTS
Figure 6-29: Neutral directional logic diagram
898017A4.cdr
Zero Sequence V
oltage(
-V
0)
SETPOINT
NTRL
DIR FUNCTION
:
Disabled
=
0
Latched
Alarm
SETPOINT
NTRL
DIR BLOCK
1:
Of
f=
0
NTRL
DIR BLOCK
2:
Of
f=
0
NTRL
DIR BLOCK
3:
Of
f=
0
OR
LED
:
ALARM
NTRL DIR REVER
SE
(T
o Neutr
al T
OC and Neutr
al IOC
)
Alarm
OR
OR
REVER
SE
(Messag
e
)
AND
AND
RE
SET
Command
SETPOINT
:
Do Not Operate, Operate
OUTPUT
RELA
Y
X
Control
OR
Neutral Current
(In
)
Ground current
(Ig
)
Voltage Polarization
-3V_
0
3I
_0
FWD
REV
REV
RUN
SETPOINT
NTRL
DIR MT
A
Curr
ent
Polarization
REV
RUN
SETPOINT
NTRL
DIR POLARIZING
:
Voltage Dual Current
OR OR
SETPOINT
MIN POL
VOL
TAGE
:
|V
0|
>
MINIMUM
AND
Ig
>
0.
05
x CT
AND
In
>
0.
05
x CT
AND
OR
XOR
AND
Ntrl Dir R
e
v
e
rs
e
BLK NTRL DIR OC UND
(
To
Neutr
al T
OC and Neutr
al IOC
)
SETPOINT
BLK NOC DIR UNDEF
Enabled
AND
AND
AND
OR
AND
(T
o Neutr
al T
OC and Neutr
al IOC
)
F
O
R
W
ARD
( * )
Polarizing voltage will be
3
V
0
when voltage is measured from the auxiliary voltage channel
(Message
)
(Flexlogic
)
(Event Recorder
,T
rasient
Recorder
)