FUNCTION CHARACTERISTICS
34
NA011 - Manual - 05 - 2022
Each overcurrent element can produce the Breaker Failure output if the
BF enable
parameters are
set to
Trip I>,
Trip I>>
and/or
Trip I>>>
inside the
Set \ Breaker failure
menu.
If the CLP function (Cold Load Pick-up) is enabled for element blocking, the selected threshold may
be blocked for an adjustable time interval
tCLP>, tCLP>>, tCLP>>>
parameters adjustable
inside the
Set \ 50/51 \
I> Element
(
I>> Element) \ Setpoints
menu), starting from the circuit breaker
closure.
This operating mode may be select by setting
On-Blocking
the
ICLP>, ICLP>>, ICLP>>>
pa-
rameters.
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 (
ON-Changing =
ICLP>, ICLP>>, ICLP>>>
) and the concerning oper-
ating time within the CLP (
tCLP>, tCLP>>, tCLP>>>
) may be adjusted inside the
Set \ 50/51
\
I> Element
(
I>> Element) \ Setpoints
menus, whereas the operating thresholds within the CLP
(
ICLP>def, ICLP>>def, ICLP>>>def
) may be adjusted inside the
Set \ 50/51 \
I> Element
(
I>>
Element, I>>> Element) \ Definite time (Inverse time)
menus.
Fun_50-51S1.ai
I
L1
I
L2
t
>RES
T
0
RESET
t
>
0
T
≥
1
t
>def
I
>def
I
>inv
t
>inv
t
>RES
Start I>
Trip I>
CB-State
(Pickup within CLP)
(Pickup outside CLP)
T
0
t
CLP>
ICLP>Mode
I
CLP>def
t
CLP>
I
CLP>inv
I
L1
≥
I
>
I
L1
≥
I
>
BF Enable (ON
≡
Enable)
I>BF
towards BF logic
I> BF
&
Trip I>
TR
IP
PIN
G
M
AT
RIX
(
LE
D+R
EL
AY
S)
I
> Curve
0
T
A
B
C
A =“1”
A =“0 or OFF”
Output
t
CLP>
I
L3
t
CLP>
CB State
CB OPEN
CB CLOSED
CB OPEN
Output t
CLP>
t
0.1 s
HIGH THRESHOLD/
BLOCK
LOW THRESHOLD/
UNBLOCK
HIGH THRESHOLD/
BLOCK
A = ON - Change setting
B = OFF
C = ON - Element blocking
I>TR-K
I>TR-L
I>ST-L
I>ST-K
Phase overcurrent (50/51) - First element logic diagram (I>)