72
72
NV10P - Manual - 01 - 2015
CHARACTERISTICS
When the CB closes, the operate time of the f>> element is automatically adjusted to a reduced
value
tcf>>def
for an adjustable time
tatcf>>def
. The reduction of the operate time for the sec-
ond threshold can be selected by setting the
EnTcf>>def
parameter inside the
Set \Profi le A(or B)
\ Overfrequency-81O \ f>> Element \ Setpoints
menu, while the timers are adjustable inside the
Set
\Profi le A(or B) \ Overfrequency-81O \ f>> Element \ Defi nite time
menu.
Breaker failure (BF)
Both overfrequency elements (
f
>,
f
>>) can produce the Breaker Failure output if the
f>BF
and
f>>BF
parameters are set to
ON.
The parameters are available inside the
Set \ Profi le A(or B) \ Overfrequency - 81O \
f> Element
(
f>>
Element) \ Setpoints
menus.
[1]
Logical block (Block1)
If the
f>BLK1
and/or
f>>BLK1
enabling parameters are set to
ON
and a binary input is designed
for logical block (Block1), the protection is blocked off whenever the given input is active.
The trip timer is held in reset condition, so the operate time counting starts when the input block goes
down.
[2]
The enabling parameters are available inside the
Set \ Profi le A(or B) \ Overfrequency - 81O
\
f> Element
(
f>> Element) \ Setpoints
menus, while the
Block1
function must be assigned to the
selected binary input inside the
Set \ Inputs \ Binary input IN1(x2)
menus (IN1 or INx matching).
Note 1 The common settings concerning the Breaker failure protection are adjustable inside the
Breaker Failure - BF
menu.
Note 2 The exhaustive treatment of the logical block (Block 1) function may be found in the “Logic Block” paragraph inside
CONTROL AND MONITOR-
ING
section.
Logic diagram concerning the first threshold (f>) of the overfrequency element - 81O
Fun-F81O_S1-cei.ai
f
> inhibition
(ON
≡
Inhibit)
&
RESET
t
f>
0
T
TRIP
P
ING
M
ATRIX
(LED
+R
EL
AY
S
)
t
f>def
f
> Start
f
> Start
f
> Trip
f
> Trip
f
> Block1
f
> Trip
BF Enable (ON
≡
Enable)
f>BF
towards BF logic
&
f
> BF
&
&
&
Enable (ON
≡
Enable)
Block1 input (ON
≡
Block)
Block1
Block1
f
≥
f
>
def
f
>
def
U
L1
,
U
L2
,
U
L3
M a x
(
U
L1...
U
L3
) ≥ 2 0 %
U
n
Binary input INx
T
0
Logic
INx
t
ON
INx
t
ON
INx
t
OFF
T
0
n.o.
n.c.
INx
t
OFF
f
>ST-K
f
>ST-L
f
>TR-K
f
>TR-L
f>BLK1
≥
1
( 1
≡
DDI closed)
DDI state
( 1
≡
upstream)
f>disbyCB_OPEN
M a x
(
f
UL1,
f
UL2,
f
UL3
)
f
UL1,
f
UL2,
f
UL3
Logic diagram concerning the second threshold (f>>) of the overfrequency element - 81O
Fun-F81O_S2-cei.ai
&
RESET
t
f>>
0
T
TR
IP
P
ING
M
ATR
IX
(LED
+R
EL
AY
S
)
f
>> Start
f
>> Start
f
>> Trip
f
>> Trip
f
>> Block1
f
>> Trip
BF Enable (ON
≡
Enable)
f>>BF
towards BF logic
&
f
>> BF
&
&
&
Enable (ON
≡
Enable)
Block1 input (ON
≡
Block)
Block1
Block1
f
≥
f
>>
def
f
>>
def
U
L1
,
U
L2
,
U
L3
M a x
(
U
L1...
U
L3
) ≥ 2 0 %
U
n
Binary input INx
T
0
Logic
INx
t
ON
INx
t
ON
INx
t
OFF
T
0
n.o.
n.c.
INx
t
OFF
f
>>ST-K
f
>>ST-L
f
>>TR-K
f
>>TR-L
f>>BLK1
( closing)
DDI OFF->ON
( 1
≡
upstream)
EnTcf>>def
t
atcf>>def
0
T
RESET
t
f>>def
t
cf>>def
t
atcf>>def
“1”
“0”
TV downstream
CB State
CB CLOSED (52a=ON)
CB OPEN (52a=OFF)
t
f>>
=
t
cf>>def
t
f>>
=
t
cf>>def
t
atcf>>def
t
f>>
t
f>>
=
t
f>>def
≥
1
( 1
≡
DDI closed)
DDI state
( 1
≡
upstream)
f>>disbyCB_OPEN
M a x
(
f
UL1,
f
UL2,
f
UL3
)
f
UL1,
f
UL2,
f
UL3