4–224
889 GENERATOR PROTECTION SYSTEM – INSTRUCTION MANUAL
PROTECTION
CHAPTER 4: SETPOINTS
Figure 4-84: Phase Undervoltage Protection logic diagram
894046A2.cdr
SETPOINTS
SETPOINT
FUNCTION
:
Disabled
T
rip
PICKUP
:
AND
Operate Output Relay
1 (TRIP
)
LED
:
PICKUP
LED
:
TRIP
OR
Alarm
OR
OR
AND
Latched
Alarm
AND
RUN
SETPOINTS
BLOCK
:
Of
f =
0
LED
:
ALARM
/
LA
TCHED
ALARM
RESET
Command
AND
S
R
LA
TCH
Configurable
FlexLogic Operands
Phase UV
1
OP
:
Phase UV
1
PKP
:
Phase UV
1
PKP
C
:
Phase UV
1
PKP
B
:
Phase UV
1
PKP
A
:
SETPOINTS
MODE
:
Phase to Ground
,
Phase to Phase
(for wye
connection
)
Phase to Phase
(Delta VT
s)
RUN
RUN
PICK
-U
P
DELA
Y
:
UNDER
VOL
T
AGE
CUR
VES
:
V
A
(V
AB
)
<
PICKUP
VB
(VBC
)
<
PICKUP
VC
(VCA
)
<
PICKUP
OR
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
AND
AND
VB
(VBC
)
>
MINIMUM
VC
(VCA
)
>
MINIMUM
AND
Phase UV
1
OP
C
:
Phase UV
1
OP
B
:
Phase UV
1
OP
A
:
MODE
:
}
{
{
}
Phase
A
voltage
(V
A
)
Phase B voltage
(V
B
)
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
889 only
