230
NVA100X-D - Manual - 02 - 2016
FUNCTION CHARACTERISTICS
For every of the four thresholds the logic block can be set.
Logical block (Block1)
If the
f<BLK1, f<<BLK1,
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.
[1]
The enabling parameters are available inside the
Set \ Profi le A(or B) \ Underfrequency
- 81U \
f< Element
(
f<< Element, f<<< Element, f<<<< Element) \ Setpoints
menus, while the
Block1
function must be assigned to the selected binary input inside the
Set \ Board 1(2) inputs \ Binary input
IN1-1...(IN1-x)
menus.
Note 1 The exhaustive treatment of the logical block (Block 1) function may be found in the “Logic Block” paragraph inside
CONTROL AND MONITOR-
ING
section.
Fun-F81U_S1.ai
RESET
t
f<def
0
T
TRIP
P
ING
M
ATRIX
(LED
+R
EL
AY
S
)
f
< Start
f
< Start
f
< Trip
f
< Trip
f
< Trip
BF Enable (ON
≡
Enable)
towards BF logic
&
Block1
f
< BF
&
&
&
Enable (ON
≡
Enable)
Block1 input (ON
≡
Block)
f
< Block1
Block1
Binary input INx
T
0
Logic
INx
t
ON
INx
t
ON
INx
t
OFF
T
0
n.o.
n.c.
INx
t
OFF
t
f<def
f
<ST-K
f
<ST-L
f
<TR-K
f
<TR-L
f<BF
From 2nd, 3rd and/or 4th element
(ON
≡
Inhibit)
f<
inhibition
&
f
≤
f
<
def
f
<
def
f
f<BLK1
U
L1
,
U
L2
,
U
L3
Max (
U
L1
,
U
L2
,
U
L3
) ≥ 2 0 %
U
n
Logic diagram concerning the first threshold (f<) of the underfrequency element - 81U
Fun-F81U_S2.ai
RESET
t
f<<
def
0
T
TRIP
P
ING
M
ATRIX
(LED
+R
EL
AY
S
)
t
f<<
def
f
<< Start
f
<< Start
f
<< Trip
f
<< Trip
f
<< Trip
BF Enable (ON
≡
Enable)
towards BF logic
&
f
<< Block1
f
<< BF
&
&
&
Enable (ON
≡
Enable)
From 3rd and/or 4th element
Block1 input (ON
≡
Block)
Block1
Block1
Binary input INx
T
0
Logic
INx
t
ON
INx
t
ON
INx
t
OFF
T
0
n.o.
n.c.
INx
t
OFF
&
(ON
≡
Inhibit)
f
< inhibition
f<disbyf<<
(ON
≡
Inhibit)
f<
< inhibition
&
f
≤
f
<<
def
f
<<
def
f
f<<BF
f
<<ST-K
f
<<ST-L
f
<<TR-K
f
<<TR-L
f<<BLK1
U
L1
,
U
L2
,
U
L3
Max (
U
L1
,
U
L2
,
U
L3
) ≥ 2 0 %
U
n
Logic diagram concerning the second threshold (f<<) of the underfrequency element - 81U
