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94
NC20 - Manual - 01 - 2015
FUNCTION CHARACTERISTICS
Fun_50-51FS3.ai
t
>>>RES
T
0
R E S E T
t
>>>def
0
T
≥
1
t
>>>def
t
>>>RES
Start I>>>
Trip I>>
>
CB-State
ON
≡
Enable I>> overcurrent element
Block1, Block2
I>>
>
TR-K
I>>
>
TR-L
I>>
>
ST-L
I>>
>
ST-K
T
0
t
CLP>>>
&
ICLP>>>Mode
t
C L P >>>
BF Enable (ON
≡
Enable)
I>>>BF
towards BF logic
I>>> BF
&
Trip I>>>
TR
IP
P
ING
M
A
TR
IX
(LED
+R
EL
A
Y
S
)
A
B
C
Output
t
CLP>>
I
>>>
Enable
I>>> overcurrent element (50/51 Fundamental) Block diagram
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
&
(ON
≡
Inhibit)
Start I>>>
I>AL inhibition
I>AL disbyl>>>
≥
1
CLP I>>>
&
(ON
≡
Inhibit)
Start I>>>
I> inhibition
I> disbyl>>>
&
(ON
≡
Inhibit)
Start I>>>
I>> inhibition
I>> disbyl>>>
I
L 1
I
L 2
≥
1
(Pickup within CLP)
(Pickup outside CLP)
I
C L P >>>def
I
L 1
≥
I
C L P >>>def
A =“1”
A =“0 or OFF”
I
L 3
&
State
I
L 1
≥
I
>>>
def
I
>>>
def
Phase overcurrent (50/51 Fundamental) - Third element logic diagram (I>>>)