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FUNCTION CHARACTERISTICS
133
NVA100X-D - Manual - 02 - 2016
Phase overcurrent (50/51) side H - First element logic diagram (I>)
Fun_50-51S1.ai
I
L 1H
I
L 2H
t
(H)
>
RES
T
0
R E S E T
t
(H)
>
0
T
≥
1
≥
1
≥
1
t
(H)
>
def
t
(H)
>
inv
t
(H)
>
RES
Start I
(H)
>
Trip I
(H)
>
CB-State
Start
I
2ndh>
ON
≡
Inhibit (from I(H)>> and/or I(H)>>> overcurrent element)
ON
≡
Enable I(H)> overcurrent element
(Pickup within CLP)
(Pickup outside CLP)
I(H)> inhibition
Block1, Block2, Block4
&
T
0
t
(H)CLP>
&
2nd harmonic restraint enable (ON
≡
Enable)
I
(H)
>2ndh-REST
I
(H)
CLP>Mode
I
(H)C L P
>
def
t
(H)C L P >
I
(H)C L P
>
inv
I
L 1H
≥
I
(H)
>
BF Enable (ON
≡
Enable)
I
(H)
>BF
towards BF logic
I
(H)
> BF
&
Trip I
(H)
>
TR
IP
P
ING
M
ATR
IX
(LED
+R
EL
AY
S
)
I
(H)
> Curve
0
T
A
B
C
A =“1”
A =“0 or OFF”
Output
t
(H)CLP>
I
L 3H
I(H)> Enable
I
(H)
> overcurrent element (50/51) 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
I(H)>TR-K
I(H)>TR-L
I(H)>ST-L
I(H)>ST-K
≥
1
CLP I
(H)
>
&
State
I
(H)
>
inv
I
L 1H
≥
I
(H)
>
def
I
L 1H
≥
I
(H)
>
inv
I
(H)
>
def
&
State