FUNCTION CHARACTERISTICS
79
NA30 - Manual - 04 - 2022
Residual overcurrent (50N/51N) - Logic diagram of the blocking signals concerning the third element (IE>>>)
IE>>>BLK1
Start
I
E
>>>
Start
I
E
>>>
Start
I
E
>>>
Trip
I
E
>>>
Pilot wire output
TR
IP
PIN
G
M
AT
RIX
(
LE
D+R
EL
AY
S)
ModeBLOUT1
A
B
C
D
BLOUT1
Block2 output
≥
1
t
F-IPh
t
F-IPh/IE
t
F-IE
ST-Iph BLK2
ST-IE BLK2
&
Block2 output
(ON
≡
Enable)
IE>>>BLK2OUT
T
0
t
F-IPh/IE
T
0
t
F-IPh
T
0
t
F-IE
BLK2OUT-Iph
BLK2OUT-Iph/IE
BLK2OUT-IE
A = OFF
B = ON IPh
C = ON IPh/IE
D = ON IE
BLK2OUT-IPh-K
BLK2OUT-IPh-L
BLK2OUT-IPh/IE-K
BLK2OUT-IPh/IE-L
BLK2OUT-IE-K
BLK2OUT-IE-L
Binary input INx (x=1,...5)
T
0
Logic
INx
t
ON
INx
t
ON
INx
t
OFF
T
0
n.o.
n.c.
INx
t
OFF
Binary input INx (x=1,...5)
T
0
Logic
INx
t
ON
INx
t
ON
INx
t
OFF
T
0
n.o.
n.c.
INx
t
OFF
Binary input INx (x=1,...5)
T
0
Logic
INx
t
ON
INx
t
ON
INx
t
OFF
T
0
n.o.
n.c.
INx
t
OFF
Binary input INx (x=1,...5)
T
0
Logic
INx
t
ON
INx
t
ON
INx
t
OFF
T
0
n.o.
n.c.
INx
t
OFF
Block2 IPh
Block2 IPh/IE
ModeBLIN1
T
0
t
B-Iph
50N-51NS3_BL-diagram.ai
≥
1
≥
1
≥
1
≥
1
t
B-Iph
t
FI-Iph
t
B-IE
BLK1IE>>>
BLK4IN IE>>>
&
&
&
BLK2IN IE>>>
&
&
Enable (ON
≡
Enable)
Block2 input enable (ON
≡
Enable)
Pilot wire input
&
IE>>>BLK2IN
Block1
BLK2IN-Iph
ST-IE BLK4
ST-Iph BLK4
Iph Block2
IE Block2
Block4 enable
BLK2IN-IE
tB timeout
Block2 input
tB-K
tB-L
Block1
FROM EARTH FAULT PROTECTIONS
FROM ANY PROTECTIONS
OFF
ON IPh
ON IPh/IE
ON IE
BLIN1
≥
1
≥
1
t
FI-IE
Block4 OUT
≥
1
T
0
t
FI-Iph
T
0
t
FI-IE
I
>> Block4 I/O
I
> Block4 I/O
I
E
>>> Block4 OUT
Block4
Block4
Phase elements
≥
1
I
>> Block4 I/O
I
> Block4 I/O
Phase elements
I
E
>> Block4 I/O
I
E
> Block4 I/O
I
E
>>> Block4 I/O
I
ED
>> Block4 I/O
I
ED
> Block4 I/O
I
ED
>>> Block4 I/O
I
ED
>>>> Block4 I/O
≥
1
I
E
>> Block2 OUT
I
E
> Block2 OUT
I
E
>>> Block2 OUT
I
ED
>> Block2 OUT
I
ED
> Block2 OUT
I
ED
>>> Block2 OUT
I
ED
>>>> Block2 OUT
Block4
Block1
T
0
t
B-IE
Block2 IE
≥
1
Block1, Block2, Block4
TR
IP
PIN
G
M
AT
RIX
(
LE
D+R
EL
AY
S)
≥
1
≥
1
A = IN
B = OFF
C = OUT
A = IN
B = OFF
C = OUT
IE>>>BLK4
C
B
A
“0”
“0”
B
C
“0”
“0”
IE>>>BLK4
A
