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66
NC20 - Manual - 01 - 2015
FUNCTION CHARACTERISTICS
Use of output relay (K1...K6):
If the
IN>BLK2OUT
enable parameter is set to
ON
and a output relay is designed for selective
block (Block2), the protection issues a block output by earth elements (BLK2OUT-IE) or by any pro-
tection element (BLK2OUT-Iph/IE), whenever the given element (Start IN>, Start IN>>) becomes ac-
tive. The enable
IN>BLK2OUT, IN>>BLK2OUT
parameters (
ON
or
OFF
) is available inside the
Set \ Profi le A(or B) \ Neutral unbalance current-46N \
Element IN> (Element IN>>) Element \ Set-
points
menus, while the
BLK2OUT-Iph-K, BLK2OUT-Iph/IE-K
and/or
BLK2OUT-IE-K
output
relays and LEDs (
BLK2OUT-Iph-L, BLK2OUT-Iph/IE-L
e/o
BLK2OUT-IE-L
) must be select
inside the
Set \ Profi le A(or B) \ Selective block-BLOCK2 \ Selective block OUT
menu.
•
46NAL.ai
I
N C
R E S E T
t
N>ALdef
0
T
≥
1
Start IN>AL
Trip I>AL
CB-State
ON
≡
Inhibit (from IN> and/or IN>> element)
ON
≡
Enable IN>AL unbalance current element
(Pickup within CLP)
(Pickup outside CLP)
IN>AL inhibition
&
T
0
t
NCLP>AL
INCLP>ALMode
I
N C L P >ALdef
t
NCLP>AL
TRIP
P
ING
M
A
TRIX
(LED
+R
EL
A
Y
S
)
A
B
C
A =“1”
A =“0 or OFF”
Output
t
NCLP>AL
IN>AL Enable
t
NCLP>
CB State
CB OPEN
CB CLOSED
CB OPEN
Output t
NCLP>
t
0.1 s
HIGH THRESHOLD/
BLOCK
LOW THRESHOLD/
UNBLOCK
HIGH THRESHOLD/
BLOCK
A = ON - Change setting
B = OFF
C = ON - Element blocking
IN>ALTR-K
IN>ALTR-L
IN>ALST-L
IN>ALST-K
≥
1
CLP IN>AL
I
N C
≥
I
N
>
ALdef
I
N
>
ALdef
I
N C
≥
I
N C L P >ALdef
t
N>ALdef
Neutral unbalance current (46N) - Alarm element logic diagram (IN>
AL
)
Binary input INx
T
0
Logic
INx
t
ON
INx
t
ON
INx
t
OFF
T
0
n.o.
n.c.
INx
t
OFF
BLK1IN>AL
&
&
&
Enable (ON
≡
Enable)
IN>ALBLK1
Block1
Start
I
N
>
AL
Trip
I
N
>
AL
Block1
Block1
Block1
