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NC20 - Manual - 01 - 2015
FUNCTION CHARACTERISTICS
Selective block (Block2)
All along the protective elements the selective block may be set.
The logic selectivity function may be performed by means any combination of the following I/O:
One committed pilot wire input (BLIN1).
One or more binary inputs designed for input selective block.
One committed pilot wire output (BLOUT1).
One or more output relays designed for output selective block.
Only when the committed pilot wire are used the continuity check of the pilot wire link is active.
Use of committed pilot wire input BLIN1:
The protection is blocked off according the selectivity block criteria when the input BLIN1 is active.
The information about phase or phase+earth block may be select programming the
ModeBLIN1
parameter inside the
Set \ Profi le A(or B) \ Selective block-BLOCK2 \ Selective block IN
menus.
Use of binary inputs:
If the
I>>BLK2IN
and/or
I>>>BLK2IN
parameters are set to
ON
and a binary input is de-
signed for selective block (Block2), the protection is blocked off by phase elements (Block2 Iph)
or by any protection element (Block2 Iph/IE) according the selectivity block criteria.
[1]
The enable
I>BLK2IN, I>>BLK2IN
and/or
I>>>BLK2IN
parameters are available inside the
Set \ Profi le
A(or B) \ Phase overcurrent-50/51 Fundamental \
I>> Element
(
I>>> Element) \ Setpoints
menus,
while the
Block2 Iph
and
Block2 Iph/IE
functions must be assigned to the selected binary inputs
inside the
Set \ Inputs \ Binary input IN1(x)
menus (IN1 or INx matching).
Use of committed pilot wire output BLOUT1:
The information about phase or phase+earth block may be select programming the
ModeBLOUT1
parameter (
OFF - ON IPh - ON IPh/IE - ON IE
) inside
Set \ Profi le A(or B) \ Selective block-
BLOCK2 \ Selective block OUT
menus.
Use of output relay (K1...K6):
If the
I>BLK2OUT, I>>BLK2OUT
and/or
I>>>BLK2OUT
enable parameters are set to
ON
and a output relay is designed for selective block (Block2), the protection issues a block output
by phase elements (BLK2OUT-Iph) or by any protection element (BLK2OUT-Iph/IE), whenever
the given element (Start I>, Start I>> e/o Start I>>>) becomes active. The enable
I>BLK2OUT,
I>>BLK2OUT
and/or
I>>>BLK2OUT
parameters (
ON
or
OFF
) are available inside the
Set
\ Profi le A(or B) \ Phase overcurrent-50/51 Fundamental \
I>> Element
(
I>>> Element) \ Setpoints
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.
All the named parameters can be set separately for
Profi le A
and
Profi le B
menus.
Note 1 The exhaustive treatment of the selective block (Block 2) function may be found in the “Selective Block” paragraph inside
CONTROL AND
MONITORING
section
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