Thytronic NA20, Manual, Page: 51 / 208

FUNCTION CHARACTERISTICS
51 NA20 - Manual - 04 - 2022
This operating mode may be select by setting
ON-Element blocking
the
I2CLP> Mode
and/or
I2CLP>> Mode
parameters.
If the CLP function (Cold Load Pick-up) is enabled for threshold change, the selected threshold may
be changed for an adjustable time interval, starting from the circuit breaker closure.
This operating mode may be select by setting
ON-Change setting
the
I2CLP> Mode
and/or
I2CLP>> Mode
parameters, whereas the operating thresholds within the CLP may be adjusted in-
side the Set \ Profile A(or B) \ Negative sequence overcurrent - 46\ I2> Element ,( I2>> Element) \ Defi-
nite time (Inverse time) menus.
For both operating modes the CLP Activation time parameters (
t2CLP>, t2CLP>>
) may be ad-
justed inside the Set \ Profile A(or B) \ Negative sequence overcurrent - 46 \ I2> Element ( I2>> Ele-
ment) \ Setpoints menus.
For both thresholds the following block criteria are available:
Logical block (Block1)
If the
I2>BLK1
and/or
I2>>BLK1
enabling parameters are set to
ON
and a binary input is de-
signed for logical block (Block1), the concerning element is blocked off whenever the given input is
active.
[1]
The enabling parameters are available inside the Set \ Profile A(or B) \ Negative sequence
overcurrent - 46 \ I2> Element ( I2>> Elemen) \ Setpoints menus, while the
Block1
function must be
assigned to the selected binary input inside the Set \ Inputs \ Binary input INx menus.
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 \ Profile A(or B) \ Selective block-BLOCK2 \ Selective block IN menus.
Use of binary inputs:
• If the
I2>BLK2IN
and/or
I2>>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.
[2]
The enable
I2>BLK2IN
and/or
I2>>BLK2IN
parameters are available inside the Set \ Profile A(or B) \ Neg-
ative sequence overcurrent - 46 \ I2> Element ( I2>> 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 INx menus (IN1... 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 \ Profile A(or B) \ Selective block-
BLOCK2 \ Selective block OUT menus.
Use of output relay (K1...K6):
• If the
I2>BLK2OUT
and/or
I2>>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
I2>BLK2OUT
and/or
I2>>BLK2OUT
parameters (
ON
or
OFF
) are available inside the Set \ Profile A(or B) \ Negative sequence overcur-
rent - 46 \ I2> Element ( I2>> 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 \ Profile A(or B) \ Selective block-BLOCK2\
Selective block OUT menu.
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
Note 2 The exhaustive treatment of the selective block (Block 2) function may be found in the “Selective Block” paragraph inside CONTROL AND MON-
ITORING section