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130
NVA100X-D - Manual - 02 - 2016
FUNCTION CHARACTERISTICS
The second overcurrent element can be programmed with defi nite or inverse time characteris-
tic by setting the I> Time characteristic (
I(H)>>Curve
) parameter (
DEFINITE, I2t
) available
inside the
Set \ Profi le A(or B) \ Phase overcurrent-50/51 side H \
I(H)> Element
(
I(H)>> Element
,
I(H)>>> Element) \ Setpoints
menu.
The trip of
I(H)
> element may be inhibited by the start of the second and/or third element
(
I(H)
>>,
I(H)
>>>) by setting
ON
the Disable I(H)> by start I(H)>>, Disable I(H)>> by start I(H)>>>
(
I(H)>disbyI(H)>>, I(H)>disbyI(H)>>>
) parameters available inside the
Set \ Profi le A(or
B) \ Phase overcurrent-50/51 side H \
I(H)> Element
(
I(H)>> Element
,
I(H)>>> Element) \ Setpoints
menus.
Similarly the trip of the
I(H)
>> element may be inhibited by start of the third element (
I(H)
>>>) by
setting
ON
the Disable I(H)>> by start I(H)>>> (
I(H)>>disbyI(H)>>>
) parameter available
inside the
Set \ Profi le A(or B) \ Phase overcurrent-50/51 side H \
I(H)> Element
(
I(H)>> Element
,
I(H)>>> Element) \ Setpoints
menu.
All the named parameters can be set separately for
Profi le A
and
Profi le B
(
Set \ Profi le A(or B)
\ Phase overcurrent-50/51 side H \
I(H)> Element
(
I(H)>> Element
,
I(H)>>> Element) \ Setpoints
menus).
An adjustable reset time delay is provided for every threshold (
t
(H)
>
RES
,
t
(H)
>>
RES
,
t
(H)
>>>
RES
).
Breaker failure (BF)
Each overcurrent element can produce the Breaker Failure output if the
I(H)> BF
,
I(H)>> BF
and/
or
I(H)>>> BF
parameters are set to
ON.
The parameters are available inside the
Set \ Profi le
A(or B) \ Phase overcurrent-50/51 side H \
I(H)> Element
(
I(H)>> Element
,
I(H)>>> Element) \ Set-
points
menus.
[1]
Second harmonic restraint
For all overcurrent elements, a block from the second harmonic restraint may be set by setting
ON
the
I>2ndh-REST, I>>2ndh-REST, I>>>2ndh-REST
parameters inside the
Set \ Profi le A(or
B) \ Phase overcurrent-50/51 side H \
I(H)> Element
(
I(H)>> Element
,
I(H)>>> Element) \ Setpoints
menus.
Cold load pickup
If the CLP function (Cold Load Pick-up) is enabled for element blocking, the selected threshold may
be blocked for an adjustable time interval, starting from the circuit breaker closure.
This operating mode may be select by setting
ON-Element blocking
the
I(H)CLP> Mode,
I(H)CLP>> Mode
and/or
I(H)CLP>>> 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
I(H)CLP> Mode,
I(H)CLP>> Mode
and/or
I(H)CLP>>> Mode
parameters, whereas the operating thresholds
within the CLP may be adjusted inside the
Set \ Profi le A(or B) \ Phase overcurrent-50/51 side H \
I(H)> Element
(
I(H)>> Element
,
I(H)>>> Element) \ Defi nite time (Inverse time)
menus.
For both operating modes the CLP Activation time parameters (
tCLP>, tCLP>>, tCLP>>>
) may
be adjusted inside the
Set \ Profi le A(or B) \ Phase overcurrent-50/51 side H \
I(H)> Element
(
I(H)>>
Element
,
I(H)>>> Element) \ Setpoints
menus.
For every of the three thresholds the following block criteria are available:
Logical block (Block1)
If the
I(H)>BLK1, I(H)>>BLK1
and/or
I(H)>>>BLK1
enabling parameters are set to
ON
and
a binary input is designed for logical block (Block1), the concerning element is blocked off whenever
the given input is active.
[2]
The enabling parameters are available inside the
Set \ Profi le A(or B) \
Phase overcurrent-50/51 side H \
I(H)> Element
(
I(H)>> Element
,
I(H)>>> Element) \ Setpoints
menus,
while the
Block1
function must be assigned to the selected binary input inside the
Set \ Board1(2)
inputs \ Binary input IN1-1...INx-x
menus.
Note 1 The common settings concerning the Breaker failure protection are adjustable inside the
Breaker Failure - BF
menu.
Note 2 The exhaustive treatment of the logical block (Block 1) function may be found in the “Logic Block” paragraph inside
CONTROL AND MONITOR-
ING
section
I> element phase overcurrent timers - 50/51 side H
Timers-F50-51.ai
I(H)> Start
I(H)> Trip
RESET
INPUT
t
(H)
>
RES
t
(H)
>
RES
t
(H)
>
RES
t
(H)
>
t
(H)
>
t