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CHARACTERISTICS
43
NV021 - Manual - 08 - 2012
Breaker failure (BF)
All undervoltage elements can produce the Breaker Failure output if the
U< BF
and
U<< BF
pa-
rameters are set to
ON.
The parameters are available inside the
Set \ Profi le A(or B) \ Undervoltage
- 27 \
U< Element
(
U<< Element) \ Setpoints
menus.
[1]
Note 1 The common settings concerning the Breaker failure protection are adjustable inside the
Breaker Failure - BF
menu.
Fun-F27_S1.ai
U< Inhibition
(ON
≡
Inhibit)
&
U
< Curve
0
T
RESET
t
U<
0
T
TRIP
P
ING
M
A
TRIX
(LED
+R
EL
A
Y
S
)
t
U<def
t
U<inv
Start U<
U<ST-K
Start U<
U<TR-K
U<ST-L
U<TR-L
Trip U<
Trip U<
Trip U<
BF Enable (ON
≡
Enable)
U<BF
towards BF logic
&
BLK1U<
U< BF
&
&
&
Enable (ON
≡
Enable)
Block1 input (ON
≡
Block)
U<BLK1
Block1
Block1
Logic27
≥1
&
U
12
,
U
L1
U
23
U
31
Binary input INx
T
0
Logic
INx
t
ON
INx
t
ON
INx
t
OFF
T
0
n.o.
n.c.
INx
t
OFF
≥
1
&
State
U
<
inv
U
≤
U<
def
U
≤
U<
inv
U
<
def
&
State
ON
≡
Enable U< undervoltage element
U< Enable
Enable (ON
≡
Enable)
MMI
Disable 27 function by operator
Logic diagram concerning the first threshold (U<) of the undervoltage element - 27
Fun-F27_S1.ai
U< Inhibition
(ON
≡
Inhibit)
&
U
< Curve
0
T
RESET
t
U<
0
T
TRIP
P
ING
M
A
TRIX
(LED
+R
EL
A
Y
S
)
t
U<def
t
U<inv
Start U<
U<ST-K
Start U<
U<TR-K
U<ST-L
U<TR-L
Trip U<
Trip U<
Trip U<
BF Enable (ON
≡
Enable)
U<BF
towards BF logic
&
BLK1U<
U< BF
&
&
&
Enable (ON
≡
Enable)
Block1 input (ON
≡
Block)
U<BLK1
Block1
Block1
Logic27
≥1
&
U
12
,
U
L1
U
23
U
31
Binary input INx
T
0
Logic
INx
t
ON
INx
t
ON
INx
t
OFF
T
0
n.o.
n.c.
INx
t
OFF
≥
1
&
State
U
<
inv
U
≤
U<
def
U
≤
U<
inv
U
<
def
&
State
ON
≡
Enable U< undervoltage element
U< Enable
Enable (ON
≡
Enable)
MMI
Disable 27 function by operator
Logic diagram concerning the first threshold (U<) of the undervoltage element - 27
all-F27.ai
U< Element
U<< Element
MMI
Start U<<
Start U<<
Start U<
Trip U<
Trip U<<
&
U< disbyU<<
&
U< inhibition
t
U< def
t
U< inv
U<
def
t
U<< def
U<<
def
U<
inv
U< Curve
U< Enable
State
Block1
BLK1U<
&
U<BLK1
Start U<
&
Block1
BLK1U<<
&
U<<BLK1
Start U<<
&
U<BF
Trip U<
&
U<BF
U<<BF
Trip U<<
&
U<<BF
U
&
U
Disable 27 function by operator
AND
U
12
,
U
23
,
U
31
U
U
L1
OR
Common configuration
Logic27
General logic diagram of the undervoltage elements - 27