GE Multilin 850, Instruction Manual

Page: 308 / 664

6–40 850 FEEDER PROTECTION SYSTEM – INSTRUCTION MANUAL
CURRENT ELEMENTS CHAPTER 6: PROTECTION SETPOINTS
Figure 6-14: Ground Directional Overcurrent Protection logic diagram
FLEXLOGIC OPERAND
FLEXLOGIC OPERAND
SETTING SETTING SETTING SETTING
SETTINGS SETTING SETTING
GROUND FUNCTION
:
DIR OC
GROUND VOL
T
:
DIR OC POL
GROUND POLARIZING
:
DIR OC
BLOCK
:
GROUND LIMIT
ANGLE
:
DIR OC FWD
GROUND ECA
:
DIR OC FWD
GROUND LIMIT
ANGLE
:
DIR OC REV
GROUND DIR OC FWD PICKUP
:
GROUND PICKUP
:
DIR OC REV
Gnd Dir OC FWD
Gnd Dir OC REV
Disabled
=
0
Measured VX V
oltage
Calculated V
_
0
}
}
Current Ground Crt
(Ig
)
K1-CT
Crt
(Ipol
)
Dual
NOTE
:
CURRENT
POLARIZING IS POSSIBLE ONL
Y
IN RELA
YS WITH
THE GROUND CURRENT
INPUTS CONNECTED
T
O
AN
ADEQUA
TE CURRENT
POLARIZING SOURCE
Of
f=
0
Enabled
=
1
AND
AND AND
AND
AND
AND
AND
OR OR
OR OR
Ipol
0.
05
xCT
Ig PICKUP
Ig PICKUP
V
oltage Polarization
Current Polarization
-3V_
0
3I
_
0
FWD
FWD FWD
REV REV
REV
RUN RUN RUN RUN
1.
25
cy
1.
5
c
y
894157A2.cdr
T
O
GROUND T
O
C
AND
IOC ELEMENTS
T
O
GROUND T
O
C
AND
IOC ELEMENTS
AND
SETPOINTS
SIGNAL
INPUT
:
CT Bank
1
-
J1
USED ONL
Y
IN
845
and
889
SETPOINTS
P
O
L
ARIZING V
O
L
SUP
V
:
lV
_
0I I
ʅ
0
.005
x V
T
IVxI
ʅ
0.
005
x V
T
USED ONL
Y
IN 850