65
NA11 - Manual - 02 - 2009
FUNCTION CHARACTERISTICS
Fun_50N-51NS2.ai
t
E >>RES
T
0
R E S E T
t
E >>
0
T
≥
1
t
E >>def
t
E >>RES
Start IE>>
Trip IE>
>
CB-State
Start
I
2ndh>
IE
>
> inhibition
Block1, Block2
&
IE>
>
TR-K
IE>
>
TR-L
IE>
>
ST-L
IE>
>
ST-K
T
0
t
E CLP>>
&
2nd harmonic restraint enable (ON
≡
Enable)
IE>>2ndh-REST
IECLP>>Mode
t
E C L P >>
BF Enable (ON
≡
Enable)
IE>>BF
towards BF logic
IE>> BF
&
Trip IE>>
TRIP
P
ING
M
A
TRIX
(LED
+R
EL
A
Y
S
)
A
B
C
Output
t
E CLP>>
IE
>>
Enable
IE>> overcurrent element (50N/51N) Block diagram
t
E CLP>>
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
&
(ON
≡
Inhibit)
Start IE>>
Start IE>>
IE> inhibition
IE> disbylE>>
≥
1
CLP IE>>
ON
≡
Inhibit
(from IE>>> residual overcurrent element)
ON
≡
Enable IE>> residual overcurrent element
Residual overcurrent (50N/51N) - Second element logic diagram (IE>>)
I
E >>def
A =“1”
A =“0 or OFF”
I
E
(Pickup within CLP)
(Pickup outside CLP)
I
EC L P >>def
I
E
≥
I
E C L P
> > d e f
&
State
I
E
≥
I
E
>>
def