GE Multilin 850, Instruction Manual

Page: 359 / 664

CHAPTER 6: PROTECTION SETPOINTS VOLTAGE ELEMENTS
850 FEEDER PROTECTION SYSTEM – INSTRUCTION MANUAL 6–91
Figure 6-36: Timed Undervoltage Protection logic diagram
894188A1.cdr
SETPOINTS
SETPOINT
FUNCTION
:
Disabled T
rip
PICKUP
:
Operate Output Relay
1 (TRIP
)
LED:
PICKUP
LED:
TRIP
OR
Alarm Latched
Alarm
RUN
SETPOINTS
BLOCK
:
Of
f
=
0
LED:
ALARM /
LA
TCHED
ALARM
RESET
Command
S R
LA
TCH
Configurable
FlexLogic Operands
T
imed UV
1
Curve OP
T
imed UV
1
PKP
T
imed UV
1
PKP
C
T
imed UV
1
PKP
B
T
imed UV
1
PKP
A
SETPOINTS
MODE
:
Phase to Ground
,
Phase to Phase
(for wye
connection
)
Phase to Phase
(Delta VT
s)
RUN RUN
V
A
(V
AB)
<
PICKUP
VB
(VBC
)
<
PICKUP
VC
(VCA
)
<
PICKUP
SETPOINTS
OPERA
TE
:
ANY
ONE
ANY
TWO
ALL
THREE
PHASES FOR OPERA
TION
:
PICK
-U
P
:
ANY
ONE
ANY
TWO
ALL
THREE
SETPOINTS
MINIMUM VOL
T
AGE
:
V
A
(V
AB)
>
MINIMUM
VB
(VBC
)
>
MINIMUM
VC
(VCA
)
>
MINIMUM
AND
T
imed UV
1
OP
C
T
imed UV
1
OP
B
T
imed UV
1
OP
A
MODE
:
}
{
{
}
Phase
A
voltage
(V
A
)
Phase B voltage
(VB
)
Phase C voltage
(V
C
)
Phase
-t
o
-Ground V
oltages
–
Wye connection
Ph
-Ph
AB voltage
(V
AB)
Ph
-Ph BC voltage
(VBC
)
Ph
-Ph CA
voltage
(VCA
)
Phase
-t
o
-Phase V
oltages
–
Delta connection
Ph
-Ph
AB voltage
(V
AB
)
Ph
-Ph BC voltage
(VBC
)
Ph
-Ph CA
voltage
(VCA
)
Calculated Phase
-t
o
-Phase
V
oltages
–
Wye connection
SETPOINTS
Do Not Operate
,
Operate
OUTPUT
RELA
YS
3
to
7
SETPOINTS
SIGNAL
INPUT
:
NAME
(
Ph VT
Bnk
1
-J
2
)
DROPOUT
DELA
Y:
DROPOUT
:
T
imed UV
1
Cnt OP
From counter based undervoltage protection logic
OR
}
CUR
VE LIMIT
1
-1
0
:
CUR
VE
TIME
1
-10
:
T
imed UV
1
OP
OR
AND AND
AND
OR
OR
AND
AND
AND