FUNCTION CHARACTERISTICS
37
NA011 - Manual - 05 - 2022
Each residual overcurrent element can produce the Breaker Failure output if the
BF enable
param-
eters are set to
Trip IE>
and/or
Trip IE>>
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 (
tECLP>, tECLP>>
parameters adjustable inside the
Set
\ 50N/51N \
IE> Element
(
IE>> Element) \ Setpoints
menu), starting from the circuit breaker closure.
This operating mode may be select by setting
On-Blocking
the
IECLP>, IECLP>>
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 (
ON-Changing =
IECLP>, IECLP>>
) and the concerning operating time
within the CLP (
tECLP>, tECLP>>
) may be adjusted inside the
Set \ 50N/51N \
IE> Element
(
IE>> Element) \ Setpoints
menus, whereas the operating thresholds within the CLP (
IECLP>def,
IECLP>def ,IECLP>>def
) may be adjusted inside the
Set \ 50N/51N \
IE> Element
(
IE>> Ele-
ment) \ Definite time (Inverse time)
menus.
Fun_50N-51NS1.ai
t
>RES
T
0
RESET
t
E>
0
T
t
E>def
t
E>inv
t
E>RES
Start IE>
Trip IE>
CB-State
T
0
t
ECLP>
IECLP>Mode
t
ECLP>
BF Enable (ON
≡
Enable)
IE>BF
towards BF logic
IE> BF
&
Trip IE>
TR
IP
PIN
G
M
AT
RIX
(
LE
D+R
EL
AY
S)
I
E
> Curve
0
T
A
B
C
A =“1”
A =“0 or OFF”
Output
t
ECLP>
t
ECLP>
CB State
CB OPEN
CB CLOSED
CB OPEN
Output t
ECLP>
t
0.1 s
HIGH THRESHOLD/
BLOCK
LOW THRESHOLD/
UNBLOCK
HIGH THRESHOLD/
BLOCK
A = ON - Change setting
B = OFF
C = ON - Element blocking
I
E
>TR-K
I
E
>TR-L
I
E
>ST-L
I
E
>ST-K
Residual overcurrent (50N/51N) - First element logic diagram (IE>)
I
E
≥
1
(Pickup within CLP)
(Pickup outside CLP)
I
ECLP>def
I
ECLP>inv
I
E
≥
I
ECLP
>
&
State
I
E
>
inv
I
E
≥
I
E
>
def
I
E
≥
I
E
>
inv
I
E
>
def
&
State