FUNCTION CHARACTERISTICS
40
NC020 - Manual - 05 - 2022
Breaker failure (BF)
The elements (I>>, I>>>) can produce the Breaker Failure output if the Trip I>> and/or Trip I>>>
outputs are set for BF Enable. The outputs are available inside the Set \ Breaker failure menu.
[1]
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-Blocking the ICLP>>and/or ICLP>>> param-
eters.
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-Changing the ICLP>>and/or ICLP>> param-
eters, whereas the operating thresholds within the CLP may be adjusted inside the Set \ 50/51 Funda-
mental \ I> Element, (I>> Element) \ I>> Definite (I>>> Definite) or I>> Inverse (I>>> Inverse) menus.
For both operating modes the CLP Activation time parameters (tCLP>>, tCLP>>>) may be ad-
justed inside the Set \ 50/51 Fundamental \ I>> Element, (I>>> Element) \ I>> Setpoint (I>>> Setpoint)
menus.
Note 1 The common settings concerning the Breaker failure protection are adjustable inside the Breaker Failure - BF menu.
Fun_50-51-S2.ai
I
L1
I
L2
I
L3
t
I
>>
RES
T0
RESET
t
I
>>
0T
≥1
≥1
t
I
>>
def
t
I
>>
inv
t
I
>>
RES
Start I>>
Trip I>>
CB-State
ON≡Enable I>> overcurrent element
(Pickup within CLP)
(Pickup outside CLP)
&
T 0
t
CLP>>
ICLP>>Mode
I
CLP
>>def
t
CLP
>>
I
CLP
>>inv
ON≡Enable
BF Enable
towards BF logic
I>> BF
&
Trip I>>
TRIPPING MATRIX
(LED+RELAYS)
I>> Curve
0T
A
B
C
A =“1”A =“0 or OFF”
Output
t
CLP>>
I>> Enable
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
LED 1
I>>ST-L
I>>ST-K
I>>
inv
I
L1
≥
I>>
def
I
L1
≥
I>>
inv
I
L1
≥
I
CLP
>>
(def/inv)
I>>
def
Fundamental phase overcurrent (50/51) - I>> element logic diagram
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