Thytronic NA011 - Page 37

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
T0
RESET
t
E>
0T
t
E>def
t
E>inv
t
E>RES
Start IE>
Trip IE>
CB-State
T 0
t
ECLP>
IECLP>Mode
t
E CLP >
BF Enable (ON≡ Enable)
IE>BF
towards BF logic
IE> BF
&
Trip IE>
TRIPPING MATRIX (LED+RELAYS)
I
E
> Curve
0T
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
E CLP >def
I
E CLP >inv
I
E
≥ I
ECLP
>
&
State
I
E
>
inv
I
E
≥ I
E
>
def
I
E
≥ I
E
>
inv
I
E
>
def
&
State