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84
NC20 - Manual - 01 - 2015
FUNCTION CHARACTERISTICS
Selective block (Block2)
For the operation threshold element, 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
parameter is set to
ON
and a binary input is designed 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
parameter is available in-
side the
Set \ Profi le A(or B) \ Phase overcurrent-50/51 RMS \
I> Element \Setpoints
menu, 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 IN2 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
enable parameter is 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>) becomes active. The
enable
I>BLK2OUT
parameter (
ON
or
OFF
) is available inside the
Set \ Profi le A(or B) \ Phase
overcurrent-50/51 RMS \
I> Element \Setpoints
menu, 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.
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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all-F50-51.ai
General logic diagram of the phase overcurrent elements - 50/51 RMS
I
L1RMS
I
L2RMS
I
L3RMS
I
L1RMS
I
L2RMS
I
L3RMS
≥
I>AL inhibition
I>
AL
disbyI>>
I>AL Element
Start I>
AL
Trip I>
AL
t
>ALdef
ICLP>
ALdef
I>
ALdef
ICLP>
AL
Mode
tCLP>
AL
I>
AL
Enable
≥
I>
AL
disbyI>>>
I> disbyI>>
I> disbyI>>>
Block1
BLK1I>
AL
&
I>
AL
BLK1
Start I>
AL
&
Start I>
&
I>
AL
disbyI>
I> inhibition
CLPI>
I> Element
BLK2OUT
BLK2INI>
Start I>
Trip I>
Block2
&
I>BLK2IN
I>BLK2OUT
I>BF
Trip I>
&
I>BF
Start I>
&
t
> def
ICLP>
def
I>
def
t
> inv
ICLP>
inv
I>
inv
I>Curve
ICLP>Mode
tCLP>
t
>RES
I> Enable
Block1
BLK1I>
&
I>BLK1
Start I>
&
Start I>
&